SAMPLE IDENTITY VARIABILITY COMPOSITE #56 CLIENT VISTA ... AMMTEC FS... · bond ball mill closed circuit grindability : 212 micrometers variability composite #56 client vista gold

BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 212 MICROMETERS

VARIABILITY COMPOSITE #56

CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY

PROJECT No A13575

DATE Nov-11

WT OF WT OF

PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE

OF 700 NEW OF OF OF OF LOAD FEED IN FEED

MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT

PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1323.3 1323.3 1050.7 272.6 153.9 0.7697 385 272.6 24.4

2 459 1323.3 272.6 960.5 362.8 338.4 0.7372 265 362.8 32.5

3 469 1323.3 362.8 924.8 398.5 366.0 0.7803 232 398.5 35.7

4 439 1323.3 398.5 945.2 378.1 342.4 0.7799 250 378.1 33.9

5 441 1323.3 378.1 945.2 378.1 344.2 0.7805 250 378.1 33.9

Note : * = Ex grinding mill

PRODUCT IN THE FEED 8.97 (%)

BULK DENSITY 1.8904 (t/m3)

IDEAL POTENTIAL PRODUCT 378.1 (g)

AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)

AVERAGE PRODUCT 0.780 (g/rev)

80 % PASSING FEED SIZE 2484 (µm)

80 % PASSING PRODUCT SIZE 154 (µm)

BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 29.0

SAMPLE IDENTITY

BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS

VARIABILITY COMPOSITE #56A13575

FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS

Size Weight Retained Passing Size Weight Retained Passing

(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 50.6 10.43 89.57 0.180 44.9 11.88 88.12

2.000 117.6 24.24 65.33 0.150 36.0 9.52 78.60

1.400 90.3 18.61 46.71 0.125 40.0 10.58 68.02

1.000 58.7 12.10 34.61 0.106 27.3 7.22 60.80

0.600 61.1 12.60 22.02 0.075 42.6 11.27 49.54

0.300 47.8 9.85 12.16 -0.075 187.3 49.54

0.212 15.5 3.20 8.97

-0.212 43.5 8.97 TOTAL 378.1 100.00

TOTAL 485.1 100.00 P 80 (µm) : 154

F 80 (µm) : 2484

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)

BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION




PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1339.3 1339.3 1099.8 239.5 144.0 0.7200 459 239.5 17.1

2 508 1339.3 239.5 980.0 359.3 342.2 0.6737 273 359.3 25.6

3 530 1339.3 359.3 935.1 404.2 378.6 0.7143 231 404.2 28.8

4 495 1339.3 404.2 967.6 371.7 342.9 0.6927 260 371.7 26.5

5 514 1339.3 371.7 956.6 382.7 356.2 0.6930 250 382.7 27.3

6 513 1339.3 382.7 956.6 382.7 355.4 0.6928 250 382.7 27.3










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 66.2 9.31 90.69 0.125 41.8 10.92 89.08

2.000 181.8 25.57 65.12 0.106 40.3 10.53 78.54

1.400 131.7 18.52 46.60 0.090 32.6 8.52 70.03

1.000 82.4 11.59 35.01 0.075 29.8 7.79 62.24

0.600 88.2 12.41 22.60 0.063 25.4 6.64 55.60

0.300 70.8 9.96 12.64 0.045 33.4 8.73 46.87

0.250 13.8 1.94 10.70 -0.045 179.4 46.87

0.150 25.4 3.57 7.13

-0.150 50.7 7.13 TOTAL 382.7 100.00

TOTAL 711.0 100.00 P 80 (µm) : 109

F 80 (µm) : 2466

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1339.4 1339.4 1073.7 265.7 175.5 0.8773 404 265.7 17.9

2 416 1339.4 265.7 1014.2 325.2 307.3 0.7387 312 325.2 21.9

3 488 1339.4 325.2 948.8 390.6 368.7 0.7555 243 390.6 26.3

4 472 1339.4 390.6 956.7 382.7 356.4 0.7551 250 382.7 25.8

5 473 1339.4 382.7 956.7 382.7 356.9 0.7546 250 382.7 25.8










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 66.2 9.31 90.69

2.000 181.8 25.57 65.12

1.400 131.7 18.52 46.60 0.150 45.9 11.99 88.01

1.000 82.4 11.59 35.01 0.125 41.7 10.90 77.11

0.600 88.2 12.41 22.60 0.106 31.7 8.28 68.83

0.300 70.8 9.96 12.64 0.075 47.3 12.36 56.47

0.212 23.5 3.31 9.34 -0.075 216.1 56.47

0.180 18.5 2.60 6.74

-0.180 47.9 6.74 TOTAL 382.7 100.00

TOTAL 711.0 100.00 P 80 (µm) : 132

F 80 (µm) : 2466

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1339.4 1339.4 1049.0 290.4 165.3 0.8266 361 290.4 27.1

2 430 1339.4 290.4 977.4 362.0 334.9 0.7788 270 362.0 33.8

3 448 1339.4 362.0 948.0 391.4 357.6 0.7982 242 391.4 36.6

4 434 1339.4 391.4 956.7 382.7 346.1 0.7976 250 382.7 35.7

5 435 1339.4 382.7 956.7 382.7 347.0 0.7976 250 382.7 35.7










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 66.2 9.31 90.69 0.180 49.8 13.01 86.99

2.000 181.8 25.57 65.12 0.150 30.6 8.00 78.99

1.400 131.7 18.52 46.60 0.125 43.3 11.31 67.68

1.000 82.4 11.59 35.01 0.106 25.7 6.72 60.96

0.600 88.2 12.41 22.60 0.075 42.1 11.00 49.96

0.300 70.8 9.96 12.64 -0.075 191.2 49.96

0.212 23.5 3.31 9.34

-0.212 66.4 9.34 TOTAL 382.7 100.00

TOTAL 711.0 100.00 P 80 (µm) : 154

F 80 (µm) : 2466

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1235.7 1235.7 1031.9 203.8 111.9 0.5593 506 203.8 15.2

2 602 1235.7 203.8 853.3 382.4 367.2 0.6100 223 382.4 28.5

3 532 1235.7 382.4 858.7 377.0 348.5 0.6552 228 377.0 28.0

4 496 1235.7 377.0 882.6 353.1 325.1 0.6553 250 353.1 26.3

5 499 1235.7 353.1 882.6 353.1 326.8 0.6550 250 353.1 26.3










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 171.6 18.58 81.42 0.125 31.0 8.78 91.22

2.000 246.3 26.67 54.74 0.106 34.2 9.69 81.53

1.400 160.3 17.36 37.38 0.090 27.9 7.90 73.63

1.000 97.4 10.55 26.84 0.075 27.7 7.84 65.79

0.600 91.7 9.93 16.90 0.063 23.7 6.71 59.08

0.300 67.5 7.31 9.59 0.045 31.1 8.81 50.27

0.250 12.9 1.40 8.20 -0.045 177.5 50.27

0.150 7.0 0.76 7.44

-0.150 68.7 7.44 TOTAL 353.1 100.00

TOTAL 923.4 100.00 P 80 (µm) : 103

F 80 (µm) : 2758

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1235.7 1235.7 1009.7 226.0 131.8 0.6590 447 226.0 17.2

2 510 1235.7 226.0 866.0 369.7 352.5 0.6911 234 369.7 28.2

3 470 1235.7 369.7 863.2 372.5 344.3 0.7326 232 372.5 28.4

4 443 1235.7 372.5 882.6 353.1 324.7 0.7330 250 353.1 26.9

5 445 1235.7 353.1 882.6 353.1 326.2 0.7330 250 353.1 26.9










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 171.6 18.58 81.42

2.000 246.3 26.67 54.74

1.400 160.3 17.36 37.38 0.150 37.4 10.59 89.41

1.000 97.4 10.55 26.84 0.125 35.9 10.17 79.24

0.600 91.7 9.93 16.90 0.106 30.7 8.69 70.55

0.300 67.5 7.31 9.59 0.075 45.4 12.86 57.69

0.212 9.8 1.06 8.53 -0.075 203.7 57.69

0.180 8.4 0.91 7.62

-0.180 70.4 7.62 TOTAL 353.1 100.00

TOTAL 923.4 100.00 P 80 (µm) : 127

F 80 (µm) : 2758

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1235.7 1235.7 984.9 250.8 145.3 0.7267 393 250.8 21.4

2 456 1235.7 250.8 873.8 361.9 340.5 0.7467 241 361.9 30.9

3 431 1235.7 361.9 875.3 360.4 329.5 0.7645 243 360.4 30.8

4 422 1235.7 360.4 882.6 353.1 322.3 0.7638 250 353.1 30.1

5 423 1235.7 353.1 882.6 353.1 323.0 0.7635 250 353.1 30.1










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 171.6 18.58 81.42 0.180 27.3 7.73 92.27

2.000 246.3 26.67 54.74 0.150 47.5 13.45 78.81

1.400 160.3 17.36 37.38 0.125 31.2 8.84 69.98

1.000 97.4 10.55 26.84 0.106 24.5 6.94 63.04

0.600 91.7 9.93 16.90 0.075 38.9 11.02 52.02

0.300 67.5 7.31 9.59 -0.075 183.7 52.02

0.212 9.8 1.06 8.53

-0.212 78.8 8.53 TOTAL 353.1 100.00

TOTAL 923.4 100.00 P 80 (µm) : 153

F 80 (µm) : 2758

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1285.7 1285.7 1058.9 226.8 111.4 0.5570 467 226.8 20.4

2 623 1285.7 226.8 857.7 428.0 407.6 0.6543 200 428.0 38.4

3 503 1285.7 428.0 907.6 378.1 339.7 0.6753 240 378.1 33.9

4 494 1285.7 378.1 918.4 367.3 333.4 0.6748 250 367.3 33.0

5 496 1285.7 367.3 874.1 411.6 378.6 0.7634 212 411.6 36.9

6 433 1285.7 411.6 918.4 367.3 330.4 0.7629 250 367.3 33.0

7 438 1285.7 367.3 955.6 330.1 297.1 0.6784 289 330.1 29.6

8 498 1285.7 330.1 875.6 410.1 380.5 0.7640 214 410.1 36.8

9 433 1285.7 410.1 918.4 367.3 330.5 0.7633 250 367.3 33.0

10 438 1285.7 367.3 918.4 367.3 334.3 0.7633 250 367.3 33.0










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 117.6 15.78 84.22 0.125 51.4 13.97 86.03

2.000 191.9 25.75 58.47 0.106 34.0 9.24 76.78

1.400 131.2 17.60 40.87 0.090 30.9 8.40 68.38

1.000 80.3 10.77 30.10 0.075 24.6 6.69 61.70

0.600 78.1 10.48 19.62 0.063 21.7 5.90 55.80

0.300 60.5 8.12 11.50 0.045 31.1 8.45 47.34

0.250 11.9 1.60 9.90 -0.045 174.1 47.34

0.150 6.9 0.93 8.98

-0.150 66.9 8.98 TOTAL 367.8 100.00

TOTAL 745.3 100.00 P 80 (µm) : 113

F 80 (µm) : 2669

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1285.7 1285.7 1024.0 261.7 143.4 0.7168 391 261.7 24.1

2 479 1285.7 261.7 899.0 386.7 362.6 0.7570 232 386.7 35.6

3 438 1285.7 386.7 911.8 373.9 338.3 0.7724 244 373.9 34.4

4 431 1285.7 373.9 918.4 367.3 332.9 0.7724 250 367.3 33.8

5 432 1285.7 367.3 892.0 393.7 359.9 0.8331 227 393.7 36.2

6 397 1285.7 393.7 918.4 367.3 331.1 0.8339 250 367.3 33.8

7 400 1285.7 367.3 918.4 367.3 333.5 0.8337 250 367.3 33.8










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 117.6 15.78 84.22

2.000 191.9 25.75 58.47

1.400 131.2 17.60 40.87 0.150 52.6 14.32 85.68

1.000 80.3 10.77 30.10 0.125 35.1 9.56 76.13

0.600 78.1 10.48 19.62 0.106 32.0 8.71 67.41

0.300 60.5 8.12 11.50 0.075 46.2 12.58 54.84

0.212 9.0 1.21 10.29 -0.075 201.4 54.84

0.180 8.1 1.09 9.20

-0.180 68.6 9.20 TOTAL 367.3 100.00

TOTAL 745.3 100.00 P 80 (µm) : 135

F 80 (µm) : 2669

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1285.7 1285.7 1038.1 247.6 115.3 0.7686 419 247.6 25.5

2 445 1285.7 247.6 907.9 377.8 352.3 0.7917 240 377.8 38.9

3 415 1285.7 377.8 905.6 380.1 341.2 0.8222 238 380.1 39.1

4 399 1285.7 380.1 918.4 367.3 328.2 0.8225 250 367.3 37.8

5 401 1285.7 367.3 918.4 367.3 329.5 0.8217 250 367.3 37.8










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 117.6 15.78 84.22 0.180 33.1 9.01 90.99

2.000 191.9 25.75 58.47 0.150 46.4 12.63 78.36

1.400 131.2 17.60 40.87 0.125 31.5 8.58 69.78

1.000 80.3 10.77 30.10 0.106 25.1 6.83 62.95

0.600 78.1 10.48 19.62 0.075 40.0 10.89 52.06

0.300 60.5 8.12 11.50 -0.075 191.2 52.06

0.212 9.0 1.21 10.29

-0.212 76.7 10.29 TOTAL 367.3 100.00

TOTAL 745.3 100.00 P 80 (µm) : 154

F 80 (µm) : 2669

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1250.2 1250.2 1015.7 234.5 154.0 0.7698 433 234.5 15.1

2 444 1250.2 234.5 922.2 328.0 312.9 0.7047 281 328.0 21.1

3 477 1250.2 328.0 886.4 363.8 342.7 0.7184 244 363.8 23.4

4 465 1250.2 363.8 893.0 357.2 333.8 0.7178 250 357.2 23.0

5 466 1250.2 357.2 876.2 374.0 351.0 0.7532 234 374.0 24.1

6 442 1250.2 374.0 893.0 357.2 333.1 0.7536 250 357.2 23.0

7 443 1250.2 357.2 893.0 357.2 334.2 0.7544 250 357.2 23.0










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 174.9 20.01 79.99

2.000 221.1 25.30 54.69

1.400 149.6 17.12 37.57 0.150 38.3 10.72 89.28

1.000 91.8 10.50 27.06 0.125 45.4 12.71 76.57

0.600 84.7 9.69 17.37 0.106 26.5 7.42 69.15

0.300 67.7 7.75 9.62 0.075 44.8 12.54 56.61

0.212 20.5 2.35 7.28 -0.075 202.2 56.61

0.180 7.3 0.84 6.44

-0.180 56.3 6.44 TOTAL 357.2 100.00

TOTAL 873.9 100.00 P 80 (µm) : 132

F 80 (µm) : 2800

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1320.3 1320.3 1095.3 225.0 86.4 0.5759 487 225.0 23.6

2 604 1320.3 225.0 880.7 439.6 416.0 0.6887 200 439.6 46.2

3 489 1320.3 439.6 888.2 432.1 385.9 0.7893 206 432.1 45.4

4 420 1320.3 432.1 962.6 357.7 312.3 0.7437 269 357.7 37.6

5 457 1320.3 357.7 943.1 377.2 339.6 0.7432 250 377.2 39.6

6 454 1320.3 377.2 943.1 377.2 337.6 0.7436 250 377.2 39.6










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 54.9 7.82 92.18 0.125 50.1 13.28 86.72

2.000 223.8 31.88 60.30 0.106 36.0 9.54 77.18

1.400 128.3 18.28 42.02 0.090 26.2 6.95 70.23

1.000 74.5 10.61 31.41 0.075 27.1 7.18 63.05

0.600 70.6 10.06 21.35 0.063 22.1 5.86 57.19

0.300 58.7 8.36 12.99 0.045 27.9 7.40 49.79

0.250 11.3 1.61 11.38 -0.045 187.8 49.79

0.150 6.2 0.88 10.50

-0.150 73.7 10.50 TOTAL 377.2 100.00

TOTAL 702.0 100.00 P 80 (µm) : 112

F 80 (µm) : 2494

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1320.3 1320.3 1072.8 247.5 106.4 0.7096 433 247.5 26.4

2 494 1320.3 247.5 925.5 394.8 368.4 0.7457 234 394.8 42.2

3 449 1320.3 394.8 934.7 385.6 343.4 0.7649 242 385.6 41.2

4 439 1320.3 385.6 922.3 398.0 356.8 0.8128 232 398.0 42.5

5 412 1320.3 398.0 943.1 377.2 334.7 0.8123 250 377.2 40.3

6 415 1320.3 377.2 943.1 377.2 336.9 0.8118 250 377.2 40.3










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 54.9 7.82 92.18

2.000 223.8 31.88 60.30

1.400 128.3 18.28 42.02 0.150 33.2 8.80 91.20

1.000 74.5 10.61 31.41 0.125 38.8 10.29 80.91

0.600 70.6 10.06 21.35 0.106 31.7 8.40 72.51

0.300 58.7 8.36 12.99 0.075 24.2 6.42 66.09

0.212 9.3 1.32 11.67 -0.075 249.3 66.09

0.180 6.9 0.98 10.68

-0.180 75.0 10.68 TOTAL 377.2 100.00

TOTAL 702.0 100.00 P 80 (µm) : 123

F 80 (µm) : 2494

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1320.3 1320.3 1047.3 273.0 119.0 0.7931 384 273.0 31.9

2 435 1320.3 273.0 929.9 390.4 358.6 0.8243 238 390.4 45.5

3 402 1320.3 390.4 942.5 377.8 332.3 0.8265 249 377.8 44.1

4 403 1320.3 377.8 943.1 377.2 333.1 0.8266 250 377.2 44.0

5 403 1320.3 377.2 917.2 403.1 359.1 0.8911 228 403.1 47.0

6 371 1320.3 403.1 943.1 377.2 330.2 0.8900 250 377.2 44.0

7 374 1320.3 377.2 943.1 377.2 333.2 0.8909 250 377.2 44.0










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 54.9 7.82 92.18 0.180 47.6 12.62 87.38

2.000 223.8 31.88 60.30 0.150 36.3 9.62 77.76

1.400 128.3 18.28 42.02 0.125 31.1 8.24 69.51

1.000 74.5 10.61 31.41 0.106 25.5 6.76 62.75

0.600 70.6 10.06 21.35 0.075 38.6 10.23 52.52

0.300 58.7 8.36 12.99 -0.075 198.1 52.52

0.212 9.3 1.32 11.67

-0.212 81.9 11.67 TOTAL 377.2 100.00

TOTAL 702.0 100.00 P 80 (µm) : 157

F 80 (µm) : 2494

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1322.2 1322.2 1062.8 259.4 145.8 0.7290 410 259.4 22.3

2 488 1322.2 259.4 956.2 366.0 343.7 0.7043 261 366.0 31.4

3 492 1322.2 366.0 922.0 400.2 368.8 0.7495 230 400.2 34.4

4 458 1322.2 400.2 930.4 391.8 357.4 0.7804 237 391.8 33.7

5 441 1322.2 391.8 944.4 377.8 344.1 0.7804 250 377.8 32.5

6 443 1322.2 377.8 944.4 377.8 345.3 0.7796 250 377.8 32.5










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 92.8 13.68 86.32 0.125 40.3 10.67 89.33

2.000 185.2 27.29 59.03 0.106 35.0 9.26 80.07

1.400 116.3 17.14 41.90 0.090 32.9 8.71 71.36

1.000 69.1 10.18 31.71 0.075 28.3 7.49 63.87

0.600 67.5 9.95 21.77 0.063 24.0 6.35 57.51

0.300 58.2 8.58 13.19 0.045 33.0 8.74 48.78

0.250 10.2 1.50 11.69 -0.045 184.3 48.78

0.150 21.0 3.09 8.59

-0.150 58.3 8.59 TOTAL 377.8 100.00

TOTAL 678.6 100.00 P 80 (µm) : 106

F 80 (µm) : 2615

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1322.2 1322.2 1024.9 297.3 174.0 0.8698 345 297.3 27.7

2 402 1322.2 297.3 976.0 346.2 318.5 0.7922 282 346.2 32.3

3 436 1322.2 346.2 932.6 389.6 357.3 0.8195 239 389.6 36.3

4 417 1322.2 389.6 933.3 388.9 352.6 0.8455 240 388.9 36.3

5 404 1322.2 388.9 944.4 377.8 341.5 0.8454 250 377.8 35.2

6 405 1322.2 377.8 944.4 377.8 342.6 0.8458 250 377.8 35.2










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 92.8 13.68 86.32

2.000 185.2 27.29 59.03

1.400 116.3 17.14 41.90 0.150 42.6 11.28 88.72

1.000 69.1 10.18 31.71 0.125 33.0 8.74 79.99

0.600 67.5 9.95 21.77 0.106 31.2 8.26 71.73

0.300 58.2 8.58 13.19 0.075 48.2 12.76 58.97

0.212 19.1 2.81 10.37 -0.075 222.8 58.97

0.180 7.1 1.05 9.33

-0.180 63.3 9.33 TOTAL 377.8 100.00

TOTAL 678.6 100.00 P 80 (µm) : 125

F 80 (µm) : 2615

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1322.2 1322.2 1045.3 276.9 139.7 0.9315 378 276.9 28.7

2 375 1322.2 276.9 965.5 356.7 328.0 0.8746 271 356.7 37.0

3 390 1322.2 356.7 941.6 380.6 343.6 0.8810 247 380.6 39.5

4 384 1322.2 380.6 944.4 377.8 338.3 0.8810 250 377.8 39.2

5 384 1322.2 377.8 944.4 377.8 338.6 0.8818 250 377.8 39.2










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 92.8 13.68 86.32 0.180 47.5 12.57 87.43

2.000 185.2 27.29 59.03 0.150 32.0 8.47 78.96

1.400 116.3 17.14 41.90 0.125 27.8 7.36 71.60

1.000 69.1 10.18 31.71 0.106 26.5 7.01 64.58

0.600 67.5 9.95 21.77 0.075 41.7 11.04 53.54

0.300 58.2 8.58 13.19 -0.075 202.3 53.54

0.212 19.1 2.81 10.37

-0.212 70.4 10.37 TOTAL 377.8 100.00

TOTAL 678.6 100.00 P 80 (µm) : 154

F 80 (µm) : 2615

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1343.5 1343.5 1053.0 290.5 170.9 0.8545 362 290.5 25.9

2 419 1343.5 290.5 996.7 346.8 320.9 0.7660 287 346.8 30.9

3 461 1343.5 346.8 953.4 390.1 359.2 0.7792 244 390.1 34.7

4 448 1343.5 390.1 947.0 396.5 361.8 0.8075 239 396.5 35.3

5 432 1343.5 396.5 959.6 383.9 348.6 0.8070 250 383.9 34.2

6 433 1343.5 383.9 959.6 383.9 349.7 0.8077 250 383.9 34.2










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 112.5 16.58 83.42 0.125 39.0 10.16 89.84

2.000 168.6 24.85 58.57 0.106 36.4 9.48 80.36

1.400 114.7 16.90 41.67 0.090 30.2 7.87 72.49

1.000 66.6 9.82 31.85 0.075 26.2 6.83 65.66

0.600 67.1 9.89 21.96 0.063 23.1 6.02 59.65

0.300 57.3 8.45 13.52 0.045 32.5 8.47 51.18

0.250 10.0 1.47 12.04 -0.045 196.5 51.18

0.150 21.3 3.14 8.90

-0.150 60.4 8.90 TOTAL 383.9 100.00

TOTAL 678.5 100.00 P 80 (µm) : 105

F 80 (µm) : 2690

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1343.5 1343.5 1048.8 294.7 165.2 0.8260 356 294.7 28.4

2 430 1343.5 294.7 973.1 370.4 342.0 0.7953 263 370.4 35.7

3 438 1343.5 370.4 944.0 399.5 363.8 0.8306 236 399.5 38.5

4 416 1343.5 399.5 959.6 383.9 345.4 0.8303 250 383.9 37.0

5 412 1343.5 383.9 959.6 383.9 346.9 0.8420 250 383.9 37.0










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 112.5 16.58 83.42

2.000 168.6 24.85 58.57

1.400 114.7 16.90 41.67 0.150 45.8 11.93 88.07

1.000 66.6 9.82 31.85 0.125 31.5 8.21 79.86

0.600 67.1 9.89 21.96 0.106 28.0 7.29 72.57

0.300 57.3 8.45 13.52 0.075 45.5 11.85 60.71

0.212 19.0 2.80 10.71 -0.075 233.1 60.71

0.180 7.3 1.08 9.64

-0.180 65.4 9.64 TOTAL 383.9 100.00

TOTAL 678.5 100.00 P 80 (µm) : 125

F 80 (µm) : 2690

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1343.5 1343.5 1047.4 296.1 152.1 1.0143 354 296.1 31.7

2 347 1343.5 296.1 995.4 348.1 316.4 0.9118 286 348.1 37.3

3 380 1343.5 348.1 962.6 380.9 343.6 0.9042 253 380.9 40.8

4 379 1343.5 380.9 959.6 383.9 343.1 0.9053 250 383.9 41.1

5 379 1343.5 383.9 959.6 383.9 342.8 0.9045 250 383.9 41.1










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 112.5 16.58 83.42 0.180 46.5 12.11 87.89

2.000 168.6 24.85 58.57 0.150 32.7 8.52 79.37

1.400 114.7 16.90 41.67 0.125 25.6 6.67 72.70

1.000 66.6 9.82 31.85 0.106 26.3 6.85 65.85

0.600 67.1 9.89 21.96 0.075 39.8 10.37 55.48

0.300 57.3 8.45 13.52 -0.075 213.0 55.48

0.212 19.0 2.80 10.71

-0.212 72.7 10.71 TOTAL 383.9 100.00

TOTAL 678.5 100.00 P 80 (µm) : 152

F 80 (µm) : 2690

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1353.3 1353.3 1081.3 272.0 272.0 1.3600 398 272.0 23.0

2 461 1353.3 272.0 1005.8 347.5 324.5 0.7039 289 347.5 29.4

3 508 1353.3 347.5 956.3 397.0 367.6 0.7237 241 397.0 33.6

4 488 1353.3 397.0 986.7 366.6 333.0 0.6825 269 366.6 31.0

5 521 1353.3 366.6 924.7 428.6 397.6 0.7632 216 428.6 36.2

6 459 1353.3 428.6 966.6 386.7 350.5 0.7636 250 386.7 32.7

7 464 1353.3 386.7 966.6 386.7 354.0 0.7630 250 386.7 32.7










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 132.5 18.95 81.05 0.125 0.0 0.00 100.00

2.000 164.5 23.52 57.53 0.106 40.6 10.50 89.50

1.400 113.4 16.22 41.31 0.090 39.3 10.16 79.34

1.000 65.7 9.40 31.92 0.075 34.9 9.03 70.31

0.600 66.3 9.48 22.44 0.063 24.2 6.26 64.05

0.300 52.4 7.49 14.94 -0.063 247.7 64.05

0.150 39.4 5.63 9.31

0.125 6.0 0.86 8.45 TOTAL 386.7 100.00

-0.125 59.1 8.45

P 80 (µm) : 91TOTAL 699.3 100.00

F 80 (µm) : 2764

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1353.3 1353.3 1075.0 278.3 152.3 0.7616 386 278.3 25.9

2 474 1353.3 278.3 972.1 381.2 355.3 0.7496 255 381.2 35.5

3 469 1353.3 381.2 942.3 411.0 375.5 0.8007 229 411.0 38.3

4 435 1353.3 411.0 966.6 386.7 348.4 0.8010 250 386.7 36.0

5 438 1353.3 386.7 966.6 386.7 350.7 0.8007 250 386.7 36.0










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 132.5 18.95 81.05 0.125 34.0 8.79 91.21

2.000 164.5 23.52 57.53 0.106 40.7 10.53 80.68

1.400 113.4 16.22 41.31 0.090 31.9 8.25 72.43

1.000 65.7 9.40 31.92 0.075 28.3 7.32 65.11

0.600 66.3 9.48 22.44 0.063 21.6 5.59 59.53

0.300 52.4 7.49 14.94 0.045 38.6 9.98 49.54

0.250 15.5 2.22 12.73 -0.045 191.6 49.54

0.150 23.9 3.42 9.31

-0.150 65.1 9.31 TOTAL 386.7 100.00

TOTAL 699.3 100.00 P 80 (µm) : 105

F 80 (µm) : 2764

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1353.3 1353.3 1084.3 269.0 127.9 0.8528 403 269.0 28.0

2 421 1353.3 269.0 980.3 373.0 345.0 0.8194 263 373.0 38.9

3 424 1353.3 373.0 955.0 398.3 359.4 0.8477 240 398.3 41.5

4 407 1353.3 398.3 966.6 386.7 345.2 0.8481 250 386.7 40.3

5 408 1353.3 386.7 966.6 386.7 346.4 0.8490 250 386.7 40.3










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 132.5 18.95 81.05

2.000 164.5 23.52 57.53

1.400 113.4 16.22 41.31 0.150 38.7 10.01 89.99

1.000 65.7 9.40 31.92 0.125 33.5 8.66 81.33

0.600 66.3 9.48 22.44 0.106 33.2 8.59 72.74

0.300 52.4 7.49 14.94 0.075 50.3 13.01 59.73

0.212 25.4 3.63 11.31 -0.075 231.0 59.73

0.180 6.2 0.89 10.42

-0.180 72.9 10.42 TOTAL 386.7 100.00

TOTAL 699.3 100.00 P 80 (µm) : 122

F 80 (µm) : 2764

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1353.3 1353.3 1056.7 296.6 143.5 0.9568 356 296.6 33.5

2 389 1353.3 296.6 991.8 361.5 328.0 0.8432 274 361.5 40.9

3 389 1353.3 361.5 960.8 392.5 351.6 0.9039 245 392.5 44.4

4 379 1353.3 392.5 966.6 386.7 342.3 0.9032 250 386.7 43.7

5 380 1353.3 386.7 966.6 386.7 343.0 0.9026 250 386.7 43.7










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 132.5 18.95 81.05 0.180 28.2 7.29 92.71

2.000 164.5 23.52 57.53 0.150 46.5 12.03 80.68

1.400 113.4 16.22 41.31 0.125 31.5 8.15 72.53

1.000 65.7 9.40 31.92 0.106 28.5 7.37 65.16

0.600 66.3 9.48 22.44 0.075 44.0 11.38 53.78

0.300 52.4 7.49 14.94 -0.075 208.0 53.78

0.212 25.4 3.63 11.31

-0.212 79.1 11.31 TOTAL 386.7 100.00

TOTAL 699.3 100.00 P 80 (µm) : 148

F 80 (µm) : 2764

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Nov-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1353.3 1353.3 994.0 359.3 157.1 1.0471 277 359.3 53.7

2 318 1353.3 359.3 975.9 377.4 323.7 1.0179 259 377.4 56.4

3 324 1353.3 377.4 963.3 390.0 333.6 1.0296 247 390.0 58.3

4 319 1353.3 390.0 966.6 386.7 328.4 1.0295 250 386.7 57.8

5 319 1353.3 386.7 966.6 386.7 328.9 1.0311 250 386.7 57.8










SAMPLE IDENTITY





(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 132.5 18.95 81.05 0.300 0.0 0.00 100.00

2.000 164.5 23.52 57.53 0.250 50.0 12.93 87.07

1.400 113.4 16.22 41.31 0.212 33.0 8.53 78.53

1.000 65.7 9.40 31.92 0.180 25.4 6.57 71.97

0.600 66.3 9.48 22.44 0.150 30.3 7.84 64.13

0.425 34.2 4.89 17.55 -0.150 248.0 64.13

0.300 18.2 2.60 14.94

-0.300 104.5 14.94 TOTAL 386.7 100.00

TOTAL 699.3 100.00 P 80 (µm) : 219

F 80 (µm) : 2764

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)


Sample ID

75 106 125 150 180 212 300

comp 4 Y Y Y Y 4

comp 10 Y 1

comp 13 Y Y 2

comp 24 Y Y Y 3

comp 27 Y Y Y Y 4

comp 28 Y Y Y Y Y Y Y 7

comp 42 Y 1

comp 47 Y Y 2

comp 52 Y 1

comp 55 Y Y Y Y Y Y Y 7

comp 56 Y Y Y 3

comp 57 Y Y Y 3

comp 58 Y Y Y 3

comp 60 Y Y Y 3

comp 61 Y 1

comp 62 Y Y Y 3

comp 65 Y Y Y 3

comp 69 Y Y Y 3

comp 74 Y Y Y Y Y 5

Total 59

Closing Screen Size (μm)

Report No. A13575 Part 1

APPENDIX XVII

Bond Master Composite

Bond Ball Mill Work Index Determination

Details and Results


SAMPLE IDENTITY BOND MASTER COMPOSITE


PROJECT No A13575

DATE Jun-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1313.1 1313.1 1128.7 184.4 110.4 0.5519 612 184.4 10.4

2 661 1313.1 184.4 967.7 345.4 335.0 0.5068 280 345.4 19.5

3 702 1313.1 345.4 918.8 394.3 374.8 0.5339 233 394.3 22.2

4 661 1313.1 394.3 901.2 411.9 389.7 0.5895 219 411.9 23.2

5 597 1313.1 411.9 931.6 381.5 358.3 0.6001 244 381.5 21.5

6 589 1313.1 381.5 937.9 375.2 353.7 0.6005 250 375.2 21.1

7 590 1313.1 375.2 937.9 375.2 354.1 0.6001 250 375.2 21.1











BOND MASTER COMPOSITE

A13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

0.075 0.0 0.00 100.00

3.350 0.0 0.00 100.00 0.063 43.2 11.51 88.49

2.800 73.1 10.82 89.18 0.053 41.2 10.98 77.50

2.000 181.0 26.78 62.41 0.045 24.0 6.40 71.11

1.400 125.7 18.60 43.81 0.038 23.3 6.21 64.90

1.000 72.1 10.67 33.14 -0.038 243.5 64.90

0.600 75.2 11.13 22.02

0.300 58.9 8.71 13.30 TOTAL 375.2 100.00

0.150 32.9 4.87 8.43

0.106 11.1 1.64 6.79 P 80 (µm) : 55

0.075 7.8 1.15 5.64

-0.075 38.1 5.64

TOTAL 675.9 100.00

F 80 (µm) : 2526

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)

BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZE DISTRIBUTION


SAMPLE IDENTITY BOND MASTER COMPOSITE


PROJECT No A13575

DATE Jun-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1289.4 1289.4 1084.1 205.3 124.6 0.623 528 205.3 12.9

2 571 1289.4 205.3 929.5 359.9 347.0 0.608 258 359.9 22.5

3 569 1289.4 359.9 905.0 384.4 361.9 0.636 235 384.4 24.1

4 541 1289.4 384.4 913.7 375.7 351.6 0.650 243 375.7 23.5

5 531 1289.4 375.7 921.0 368.4 344.9 0.649 250 368.4 23.1

6 532 1289.4 368.4 921.0 368.4 345.3 0.649 250 368.4 23.1












A13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 88.7 13.04 86.96 0.090 39.1 10.61 89.39

2.000 180.5 26.53 60.44 0.075 35.8 9.72 79.67

1.400 127.8 18.78 41.65 0.063 22.6 6.13 73.53

1.000 70.8 10.41 31.25 0.045 50.1 13.60 59.93

0.600 73.6 10.82 20.43 -0.045 220.8 59.93

0.300 55.7 8.19 12.24

0.150 30.5 4.48 7.76 TOTAL 368.4 100.00

0.106 10.2 1.50 6.26

-0.106 42.6 6.26 P 80 (µm) : 76

TOTAL 680.4 100.00

F 80 (µm) : 2590

0

10

20

30

40

50

60

70

80

90

100

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Jun-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1312.9 1312.9 1072.6 240.3 148.5 0.7425 446 240.3 16.8

2 483 1312.9 240.3 950.0 362.9 346.1 0.7166 262 362.9 25.4

3 488 1312.9 362.9 929.2 383.7 358.3 0.7343 242 383.7 26.8

4 474 1312.9 383.7 937.8 375.1 348.3 0.7347 250 375.1 26.2

5 475 1312.9 375.1 937.8 375.1 348.9 0.7345 250 375.1 26.2










SAMPLE IDENTITY



A13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 87.6 13.23 86.77 0.125 46.9 12.50 87.50

2.000 187.7 28.35 58.42 0.106 33.5 8.93 78.57

1.400 127.3 19.23 39.19 0.090 29.8 7.94 70.62

1.000 68.8 10.39 28.80 0.075 25.4 6.77 63.85

0.600 68.1 10.29 18.52 0.063 16.0 4.27 59.59

0.300 49.7 7.51 11.01 0.045 34.2 9.12 50.47

0.250 9.5 1.43 9.58 -0.045 189.3 50.47

0.150 17.1 2.58 6.99

-0.150 46.3 6.99 TOTAL 375.1 100.00

TOTAL 662.1 100.00 P 80 (µm) : 109

F 80 (µm) : 2609

0

10

20

30

40

50

60

70

80

90

100

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Jun-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1289.1 1289.1 1004.7 284.4 168.4 0.8422 353 284.4 25.6

2 407 1289.1 284.4 931.6 357.5 331.9 0.8155 261 357.5 32.2

3 412 1289.1 357.5 911.7 377.4 345.2 0.8380 242 377.4 33.9

4 399 1289.1 377.4 920.8 368.3 334.4 0.8380 250 368.3 33.1

5 400 1289.1 368.3 920.8 368.3 335.2 0.8379 250 368.3 33.1










SAMPLE IDENTITY



A13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 91.4 13.11 86.89 0.180 36.0 9.77 90.23

2.000 194.0 27.83 59.05 0.150 24.0 6.52 83.71

1.400 132.6 19.02 40.03 0.125 43.7 11.87 71.84

1.000 72.9 10.46 29.57 0.106 27.5 7.47 64.38

0.600 72.7 10.43 19.14 0.075 38.6 10.48 53.90

0.300 53.7 7.70 11.43 -0.075 198.5 53.90

0.212 17.0 2.44 9.00

-0.212 62.7 9.00 TOTAL 368.3 100.00

TOTAL 697.0 100.00 P 80 (µm) : 142

F 80 (µm) : 2602

0

10

20

30

40

50

60

70

80

90

100

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575 DUPLICATE TEST

DATE Jun-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1259.7 1259.7 978.5 281.2 152.6 1.0173 348 281.2 28.7

2 326 1259.7 281.2 963.3 296.4 267.7 0.8211 325 296.4 30.3

3 401 1259.7 296.4 893.4 366.3 336.0 0.8380 244 366.3 37.4

4 385 1259.7 366.3 908.9 350.8 313.4 0.8140 259 350.8 35.8

5 398 1259.7 350.8 899.8 359.9 324.1 0.8143 250 359.9 36.7

6 397 1259.7 359.9 899.8 359.9 323.2 0.8140 250 359.9 36.7










SAMPLE IDENTITY



A13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 106.2 13.35 86.65 0.180 46.2 12.84 87.16

2.000 200.9 25.26 61.39 0.150 32.3 8.97 78.19

1.400 142.3 17.89 43.50 0.125 33.6 9.34 68.85

1.000 85.8 10.79 32.71 0.106 24.1 6.70 62.16

0.600 87.3 10.98 21.74 0.075 38.1 10.59 51.57

0.300 69.2 8.70 13.04 -0.075 185.6 51.57

0.212 22.5 2.83 10.21

-0.212 81.2 10.21 TOTAL 359.9 100.00

TOTAL 795.4 100.00 P 80 (µm) : 156

F 80 (µm) : 2589

0

10

20

30

40

50

60

70

80

90

100

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575

DATE Jun-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1312.9 1312.9 988.3 324.6 157.9 1.0525 304 324.6 41.2

2 317 1312.9 324.6 960.0 352.9 311.7 0.9832 272 352.9 44.8

3 336 1312.9 352.9 936.6 376.3 331.5 0.9866 249 376.3 47.8

4 332 1312.9 376.3 937.8 375.1 327.3 0.9859 250 375.1 47.6

5 332 1312.9 375.1 937.8 375.1 327.5 0.9863 250 375.1 47.6










SAMPLE IDENTITY



A13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 88.9 12.67 87.33 0.300 0.0 0.00 100.00

2.000 182.9 26.07 61.26 0.250 44.4 11.84 88.16

1.400 129.3 18.43 42.83 0.212 32.2 8.58 79.58

1.000 73.8 10.52 32.31 0.180 26.4 7.04 72.54

0.600 77.2 11.00 21.31 0.15 18.2 4.85 67.69

0.425 33.0 4.70 16.60 -0.150 253.9 67.69

0.300 27.4 3.91 12.70

-0.300 89.1 12.70 TOTAL 375.1 100.00

TOTAL 701.6 100.00 P 80 (µm) : 214

F 80 (µm) : 2575

0

10

20

30

40

50

60

70

80

90

100

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)





PROJECT No A13575 DUPLICATE TEST

DATE Jun-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 150 1244.7 1244.7 963.3 281.4 133.2 0.8880 342 281.4 33.5

2 363 1244.7 281.4 889.7 355.0 321.5 0.8857 251 355.0 42.3

3 354 1244.7 355.0 879.1 365.6 323.3 0.9134 240 365.6 43.5

4 342 1244.7 365.6 899.3 345.4 301.9 0.8827 260 345.4 41.1

5 356 1244.7 345.4 889.1 355.6 314.5 0.8834 250 355.6 42.3

6 355 1244.7 355.6 889.1 355.6 313.3 0.8824 250 355.6 42.3










SAMPLE IDENTITY



A13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 98.3 12.49 87.51 0.300 0.0 0.00 100.00

2.000 214.4 27.24 60.27 0.250 43.5 12.23 87.77

1.400 148.7 18.89 41.37 0.212 33.1 9.31 78.46

1.000 86.6 11.00 30.37 0.180 27.8 7.82 70.64

0.600 83.0 10.55 19.82 0.15 23.6 6.64 64.01

0.425 34.6 4.40 15.43 -0.150 227.6 64.01

0.300 27.7 3.52 11.91

-0.300 93.7 11.91 TOTAL 355.6 100.00

TOTAL 787.0 100.00 P 80 (µm) : 218

F 80 (µm) : 2579

0

10

20

30

40

50

60

70

80

90

100

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)



APPENDIX XVIII

Mt Todd Master Composite

Bond Ball Mill Work Index Determination

Details and Results


PLANT FEED MASTER COMPOSITE


PROJECT No A13575

DATE Jul-11

WT OF WT OF




PER REV NEXT CYCLE

(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)

1 200 1238.9 1238.9 951.2 287.7 171.4 0.8571 331 287.7 27.0

2 381 1238.9 287.7 910.1 328.8 301.8 0.7921 277 328.8 30.9

3 408 1238.9 328.8 863.4 375.5 344.6 0.8447 230 375.5 35.2

4 377 1238.9 375.5 893.7 345.2 310.0 0.8222 259 345.2 32.4

5 391 1238.9 345.2 884.9 354.0 321.6 0.8225 250 354.0 33.2

6 390 1238.9 354.0 884.9 354.0 320.8 0.8225 250 354.0 33.2










SAMPLE IDENTITY


PLANT FEED MASTER COMPOSITEA13575



(mm) (g) (%) (%) (mm) (g) (%) (%)

2.800 88.8 13.71 86.29 0.180 42.8 12.09 87.91

2.000 170.8 26.37 59.93 0.150 30.4 8.59 79.32

1.400 122.5 18.91 41.02 0.125 30.4 8.59 70.73

1.000 71.2 10.99 30.02 0.106 21.6 6.10 64.63

0.600 67.0 10.34 19.68 0.075 35.0 9.89 54.74

0.300 51.0 7.87 11.81 -0.075 193.8 54.74

0.212 15.7 2.42 9.39

-0.212 60.8 9.39 TOTAL 354.0 100.00

TOTAL 647.8 100.00 P 80 (µm) : 152

F 80 (µm) : 2609

0

10

20

30

40

50

60

70

80

90

100

10 100 1000 10000

% P

AS

SIN

G

SIZE (MICROMETERS)



APPENDIX XIX


Oxygen Uptake Rate Determination

Details and Results

PROJECT A13575 : MT TODD FEASABILITY STUDY

CLIENT VISTA GOLD CORPORATION

SAMPLE PLANT FEED MASTER COMPOSITE

WATER PERTH TAP WATER

GRIND SIZE P80 P80 : 106 MICRONS

PULP DENSITY 55% SOLIDS (w/w)

STARTING SLURRY pH 11.02 (LIME)

NaCN ADDITION 0.10% (w/v)

DATE JULY 2011

OXYGEN UPTAKE RATE DETERMINATION : AIR WAS UTILISED

DISSOLVED OXYGEN CONCENTRATION (mg/l) @ ELAPSED TIME

Time

[mins] @ 0 Hr * @ 1 Hr @ 2 Hr @ 3 Hr @ 4 Hr @ 5 Hr @ 6 Hr @ 24 Hr

0 7.8 8.6 9.1 8.7 8.7 9.1 9.2 11.9

1 7.5 8.5 9.0 8.7 8.5 8.9 9.1 11.9

2 7.3 8.4 8.9 8.7 8.4 8.8 9.0 11.9

3 7.2 8.4 8.8 8.7 8.4 8.8 9.0 11.9

4 7.2 8.3 8.8 8.7 8.4 8.8 9.0 12.0

5 7.1 8.3 8.8 8.6 8.4 8.8 8.9 12.0

6 7.0 8.3 8.7 8.6 8.4 8.7 8.9 12.0

7 6.9 8.3 8.7 8.6 8.3 8.7 8.9 12.1

8 6.9 8.2 8.7 8.5 8.3 8.7 8.9 12.1

9 6.8 8.2 8.7 8.5 8.3 8.7 8.9 12.1

10 6.8 8.2 8.6 8.5 8.3 8.7 8.9 12.1

11 6.7 8.2 8.6 8.5 8.3 8.6 8.9 12.1

12 6.7 8.2 8.5 8.4 8.3 8.6 8.9 12.1

13 6.7 8.2 8.5 8.4 8.3 8.6 8.9 12.1

14 6.7 8.1 8.4 8.4 8.3 8.6 8.8 12.1

15 6.7 8.1 8.1 8.4 8.3 8.6 8.8 12.1

SLOPE

mg/l/min -0.0641 -0.0269 -0.0475 -0.0246 -0.0178 -0.0254 -0.0185 0.0163

pH 10.7 10.5 10.5 10.6 10.6 10.7 10.7 10.6

* : Baseline data prior to aeration.


APPENDIX XX


Optimisation CIL Cyanidation Leach Testwork

Details and Results

ANALYTE UNIT

Au1 g/t 1.06

Au2 g/t 1.02

Au3 g/t 1.15 / 1.23

Au4 g/t 1.01 / 0.96

Ag g/t 1.1

As ppm 290

Al % 7.24

Ba ppm 500

Be ppm 5.1

Bi ppm < 10

Ctotal % 0.15

Corganic % < 0.03

CO32- % 0.75

Ca % 4000

Cd ppm < 5

Co ppm 30

Cr ppm 60

Cu ppm 482

CN Sol. Cu ppm 204

Fe % 5.50

Hg ppm < 0.1

K % 3.20

Li ppm 20

Mg % 1.28

Mn ppm 400

Mo ppm < 5

Na ppm 2260

Ni ppm 65

P ppm 500

Pb ppm 400

Pd1 ppm < 0.02

Pd2 ppm < 0.02

Pt1 ppm < 0.02

Pt2 ppm < 0.02

Stotal % 1.24 / 1.32 / 1.16

Ssulfide % 1.04

Sb ppm 2.5

SiO2 % 65.4

Sn ppm 50

Sr ppm 14

Te ppm < 0.2

Th ppm 10

Ti ppm 3400

U ppm 3.4

V ppm 88

Y ppm 24

Zn ppm 792

Zr ppm 150

True SG g/mL 3.3491

PLANT FEED MASTER COMPOSITE

VISTA GOLD CORPORATION

A13575 MT TODD PROJECT FEASIBILITY STUDY

COMPREHENSIVE HEAD ANALYSIS

PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH3788

PLANT FEED MASTER COMPOSITEGRIND P80 : 212 µmWATER PERTH TAP WATERDATE JULY 2011

ADDITIONS

TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Au Cu Cu

(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Leach Total Leach Total

Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.36

0 2.45 0.88 5.8 11.01 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 26.0 10.60 0.078 0.720 6.58 0 0 58.81 58.81 1.01 1.01

2 0.00 0.00 20.9 10.75 0.075 0.785 9.44 0 0 64.12 64.12 1.45 1.45

4 72.2 0.00 0.00 18.8 10.64 0.068 0.855 15.6 0 0 69.84 69.84 2.39 2.39

6 61.0 0.00 0.00 16.1 10.63 0.058 0.000 18.1 11.17 30 52 72.05 72.05 3.01 3.01

8 55.2 1.20 0.00 13.4 10.49 0.048 0.000 21.8 5.77 30 78 72.05 72.05 3.68 3.68

12 49.8 0.00 0.00 14.9 10.65 0.070 0.000 29.3 5.41 30 92 72.05 72.05 4.88 4.88

24 49.8 0.00 0.00 11.6 10.40 0.035 0.000 43.5 30 176 72.05 72.05 7.32 7.32

Product Quantity Assay Total Dist'n Assay Total Dist'n

(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.22 (Kg/t)

2. NaCN Consumption : 0.89 (Kg/t)

3000.0 0.28 840 27.95 494.0 1482000 92.68 3. Lime Consumption : 0.29 (Kg/t)

2454.5 0.000 0 0.00 43.500 106773 6.68 4. Perth Tap Water Used : 1.000 (SG)

671 22.31 1529 0.10 5. Water weight to leach: 2454.5 (g)

49.8 30.0 1495 49.74 176.0 8768 0.55 6. Grind Size P 80 : 212 (µm)

7. 72.0 grams of Haycarb Yao activated

72.05 7.32 carbon was added to the slurry after

Total 3005 100.00 1599070 100.00 4 hours residence time.

Calculated Grade 1.00 533 8. Evaporation losses made up prior to

Assay Grade 1.06 / 1.02 482 sampling at each period.

* Carbon samples removed at each sampling interval.

SAMPLE

CIL CYANIDATION TIME LEACH TESTWORK : GRIND OPTIMISATION

SOLUTION DATA PREG. CARBON

GOLD & COPPER EXTRACTION CALCULATIONS

Solids (g)

COPPER

EXTRACTION

Total Extraction

Intermed.Carbon *

Final Carbon (g)

Solution (mls)

COMMENTS :GOLD

0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)

RATE OF GOLD & COPPER EXTRACTION

Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 6.36

0 2.45 0.92 3.7 10.93 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 24.5 10.59 0.078 0.695 6.50 0 0 58.40 58.40 1.04 1.04

2 0.00 0.00 19.1 10.71 0.075 0.765 9.92 0 0 64.28 64.28 1.59 1.59

4 72.0 0.00 0.00 17.2 10.55 0.068 0.855 17.2 0 0 71.84 71.84 2.76 2.76

6 57.4 0.00 0.00 20.2 10.58 0.055 0.000 20.7 14.60 30 50 73.94 73.94 3.56 3.56

8 43.8 1.20 0.00 15.4 10.46 0.050 0.000 24.5 13.59 31 98 75.91 75.91 4.35 4.35

12 34.3 0.00 0.00 12.6 10.39 0.065 0.000 33.1 9.51 32 102 77.41 77.41 5.74 5.74

24 34.3 0.00 0.00 9.9 10.10 0.037 0.000 47.7 32 290 77.41 77.41 8.51 8.51




3000.0 0.22 660 22.59 466 1398000 91.49 3. Lime Consumption : 0.31 (Kg/t)



34.3 32.0 1098 37.57 290.0 9947 0.65 6. Grind Size P 80 : 150 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction


GOLD COPPER COMMENTS :

SAMPLE


SOLUTION DATA PREG. CARBON EXTRACTION

0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.35

0 2.45 0.99 3.7 11.03 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 32.5 10.57 0.080 0.755 8.60 0 0 75.52 75.52 1.35 1.35

2 0.00 0.00 29.6 10.69 0.070 0.785 12.3 0 0 78.52 78.52 1.93 1.93

4 72.0 0.00 0.00 32.5 10.57 0.068 0.790 21.2 0 0 79.02 79.02 3.32 3.32

6 61.0 0.00 0.00 31.5 10.65 0.055 0.000 24.7 11.03 27 68 79.22 79.22 4.18 4.18

8 48.4 1.20 0.00 26.6 10.54 0.050 0.000 28.7 12.57 27 92 79.22 79.22 4.90 4.90

12 39.5 0.00 0.00 15.7 10.67 0.073 0.000 39.7 8.86 27 106 79.22 79.22 6.67 6.67

24 39.5 0.00 0.00 13.8 10.64 0.038 0.000 52.5 27 174 79.22 79.22 8.85 8.85







39.5 27.0 1068 43.50 174.0 6880 0.44 6. Grind Size P 80 : 106 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.37

0 2.45 0.92 2.7 10.90 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 25.9 10.89 0.083 0.800 8.38 0 0 68.61 68.61 1.28 1.28

2 0.00 0.00 24.6 10.91 0.078 0.875 14.0 0 0 75.04 75.04 2.14 2.14

4 72.0 0.00 0.00 25.4 10.78 0.073 0.925 22.1 0 0 79.33 79.33 3.38 3.38

6 59.5 0.00 0.00 20.4 10.78 0.065 0.000 26.6 12.46 32 62 80.50 80.50 4.34 4.34

8 48.4 0.00 0.00 16.3 10.63 0.058 0.000 30.7 11.10 33 88 82.58 82.58 5.07 5.07

12 41.0 1.47 0.00 15.2 10.59 0.040 0.000 38.2 7.42 34 122 84.28 84.28 6.31 6.31

24 41.0 0.00 0.00 14.4 10.74 0.053 0.000 56.3 34 180 84.28 84.28 9.23 9.23







41.0 34.0 1395 48.73 180.0 7384 0.46 6. Grind Size P 80 : 75 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)

RATE OF GOLD & COPPER EXTRACTIONAu-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.37

0 2.45 0.98 1.7 11.13 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 25.5 10.53 0.075 0.880 8.00 0 0 72.58 72.58 1.24 1.24

2 0.00 0.00 24.1 10.62 0.070 0.910 12.9 0 0 75.05 75.05 2.00 2.00

4 72.0 0.00 0.00 22.4 10.51 0.060 0.955 22.4 0 0 78.76 78.76 3.48 3.48

6 60.2 1.23 0.00 20.9 10.60 0.050 0.000 26.8 11.80 34 60 82.25 82.25 4.44 4.44

8 47.9 0.00 0.00 20.1 10.58 0.093 0.000 34.2 12.26 35 84 84.28 84.28 5.68 5.68

12 40.2 0.00 0.00 19.6 10.70 0.065 0.000 47.6 7.71 36 84 85.89 85.89 7.76 7.76

24 40.2 0.00 0.00 19.6 10.76 0.045 0.000 69.9 36 204 85.89 85.89 11.53 11.53







40.2 36.0 1448 48.66 204.0 8207 0.52 6. Grind Size P 80 : 53 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.35

0 2.45 0.97 3.7 11.07 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 24.2 10.68 0.080 0.698 6.32 0 0 56.45 56.45 0.95 0.95

2 0.00 0.00 22.6 10.75 0.078 0.779 9.38 0 0 63.00 63.00 1.41 1.41

4 72.0 0.00 0.00 15.6 10.67 0.068 0.861 16.2 0 0 69.63 69.63 2.44 2.44

6 65.1 0.00 0.00 16.9 10.72 0.060 0.000 19.5 6.89 30 52 71.17 71.17 3.16 3.16

8 56.8 0.00 0.00 19.7 10.59 0.055 0.000 23.1 8.32 31 74 73.31 73.31 3.79 3.79

12 52.5 1.84 0.00 12.8 10.40 0.025 0.000 29.2 4.30 31 106 73.31 73.31 4.82 4.82

24 52.5 0.00 0.00 11.5 10.46 0.057 0.000 46.9 31 156 73.31 73.31 7.65 7.65







52.5 31.0 1627 53.61 156.0 8188 0.50 6. Grind Size P 80 : 212 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.38

0 2.45 0.94 5.6 11.06 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 35.5 10.51 0.080 0.820 8.14 0 0 67.76 67.76 1.33 1.33

2 0.00 0.00 31.8 10.52 0.075 0.860 11.8 0 0 71.07 71.07 1.93 1.93

4 72.0 0.00 0.00 14.3 10.40 0.068 0.901 19.6 0 0 74.45 74.45 3.21 3.21

6 60.3 0.00 0.00 18.3 10.47 0.065 0.000 24.7 11.75 31 82 75.14 75.14 4.44 4.44

8 48.1 0.00 0.00 19.8 10.35 0.058 0.000 26.6 12.12 32 94 77.17 77.17 4.80 4.80

12 39.9 1.64 0.00 18.9 10.37 0.033 0.000 33.1 8.27 33 166 78.79 78.79 6.09 6.09

24 39.9 0.00 0.00 16.9 10.67 0.065 0.000 56.2 33 182 78.79 78.79 9.92 9.92







39.9 33.0 1315 44.28 182.0 7255 0.48 6. Grind Size P 80 : 150 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.37

0 2.45 0.96 2.1 10.91 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 29.7 10.57 0.075 0.905 7.44 0 0 72.18 72.18 1.14 1.14

2 0.00 0.00 26.7 10.65 0.073 0.965 11.5 0 0 76.97 76.97 1.77 1.77

4 72.0 0.00 0.00 21.7 10.55 0.068 0.986 19.3 0 0 78.64 78.64 2.97 2.97

6 59.4 0.00 0.00 24.3 10.61 0.055 0.000 23.0 12.63 34 64 79.55 79.55 3.83 3.83

8 46.9 1.20 0.00 18.4 10.53 0.050 0.000 26.1 12.43 35 120 81.48 81.48 4.51 4.51

12 38.1 0.00 0.00 16.6 10.66 0.070 0.000 34.8 8.84 35 154 81.48 81.48 5.95 5.95

24 38.1 0.00 0.00 13.2 10.59 0.041 0.000 51.3 35 228 81.48 81.48 8.66 8.66







38.1 35.0 1334 43.33 228.0 8687 0.54 6. Grind Size P 80 : 106 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.39

0 2.45 0.90 3.7 10.92 0.100 0.000 0.0 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 30.9 10.37 0.073 0.870 10.8 0 0 74.01 74.01 1.69 1.69

2 0.00 0.00 29.4 10.37 0.073 0.896 13.6 0 0 76.22 76.22 2.13 2.13

4 72.0 0.00 0.00 18.9 10.27 0.068 0.936 23.9 0 0 79.62 79.62 3.75 3.75

6 59.5 0.00 0.00 26.2 10.38 0.058 0.010 26.6 12.50 33 124 83.19 83.19 4.74 4.74

8 49.6 0.00 0.00 27.6 10.27 0.053 0.000 30.4 9.92 34 172 84.40 84.40 5.52 5.52

12 41.0 1.77 0.00 15.5 10.20 0.028 0.000 39.5 8.60 34 196 84.40 84.40 7.02 7.02

24 41.0 0.00 0.00 12.1 10.34 0.059 0.000 57.5 34 214 84.40 84.40 9.90 9.90







41.0 34.0 1393 48.29 214.0 8770 0.56 6. Grind Size P 80 : 75 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 8.41

0 2.45 1.08 5.2 10.99 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 19.4 10.66 0.075 0.885 8.86 0 0 73.34 73.34 1.35 1.35

2 0.00 0.00 20.8 10.73 0.068 0.925 12.5 0 0 76.65 76.65 1.91 1.91

4 72.0 0.00 0.00 19.1 10.69 0.063 0.958 24.3 0 0 79.38 79.38 3.71 3.71

6 64.1 1.35 0.00 17.1 10.71 0.045 0.000 25.8 7.91 34 90 82.64 82.64 4.34 4.34

8 53.0 0.00 0.00 24.3 10.65 0.095 0.000 31.8 11.06 35 100 84.81 84.81 5.30 5.30

12 46.1 0.00 0.00 14.1 10.80 0.065 0.000 43.3 6.93 35 140 84.81 84.81 7.18 7.18

24 46.1 0.00 0.00 11.3 10.60 0.033 0.000 59.4 35 298 84.81 84.81 10.09 10.09







46.1 35.0 1614 54.47 298.0 13738 0.85 6. Grind Size P 80 : 53 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 6.8 8.41

PRE-OXYGENATION 0.97 11.03

1 0.32 37.2 10.13

2 0.23 36.5 10.42

3 0.10 36.8 10.71

4 0.09 28.8 10.65

0 2.45 0.00 28.8 10.65 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 25.1 10.79 0.090 0.780 9.20 0 0 63.28 63.28 1.45 1.45

2 0.00 0.00 19.9 10.71 0.088 0.835 12.3 0 0 67.74 67.74 1.94 1.94

4 72.0 0.00 0.00 13.3 10.46 0.083 0.887 17.3 0 0 71.96 71.96 2.73 2.73

6 61.5 0.00 0.00 14.8 10.35 0.073 0.000 20.7 10.47 32 96 76.15 76.15 3.71 3.71

8 52.9 0.00 0.00 18.6 10.32 0.063 0.000 23.3 8.64 33 136 78.19 78.19 4.28 4.28

12 44.8 1.23 0.00 14.6 10.35 0.050 0.000 27.1 8.14 33 148 78.19 78.19 4.92 4.92

24 44.8 0.00 0.00 10.9 10.33 0.061 0.000 42.2 33 160 78.19 78.19 7.34 7.34







44.8 33.00 1477 48.81 160 7160 0.46 6. Grind Size P 80 : 150 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE

CIL CYANIDATION TIME LEACH TESTWORK : PRE-LEACH OXYGENATION


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

3000.0 2454.5 6.7 8.40

PRE-OXYGENATION 0.96 11.06

1 0.24 26.3 10.10

2 0.2 27.9 10.30

3 0.13 29.6 10.51

4 0.13 23.3 10.54

0 2.45 0.00 23.3 10.54 0.100 0.000 0.00 0 0 0.00 0.00 0.00 0.00

1 0.00 0.00 19.0 10.77 0.090 0.815 8.52 0 0 68.35 68.35 1.33 1.33

2 0.00 0.00 18.8 10.69 0.088 0.860 12.1 0 0 72.12 72.12 1.89 1.89

4 72.0 0.00 0.00 13.4 10.46 0.083 0.885 17.9 0 0 74.22 74.22 2.80 2.80

6 64.9 0.00 0.00 14.2 10.39 0.065 0.000 20.2 7.12 31 102 76.26 76.26 3.63 3.63

8 57.5 0.00 0.00 18.2 10.36 0.058 0.000 22.9 7.38 32 150 78.48 78.48 4.25 4.25

12 48.8 1.28 0.00 14.3 10.35 0.048 0.000 27.3 8.74 32 162 78.48 78.48 4.99 4.99

24 48.8 0.00 0.00 11.5 10.59 0.063 0.000 44.7 32 172 78.48 78.48 7.74 7.74







48.8 32.00 1560 53.31 172 8387 0.54 6. Grind Size P 80 : 150 (µm)







Solids (g)

Solution (mls)

Intermed.Carbon *

Final Carbon (g)

Total Extraction



SAMPLE

CIL CYANIDATION TIME LEACH TESTWORK : PRE-LEACH OXYGENATION


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH3860SAMPLE PLANT FEED MASTER COMPOSITEGRIND P80 : 125 µmWATER PERTH TAP WATERDATE AUGUST 2011

SPARGE OPTIMISATION CYANIDATION TIME LEACH TESTWORK - NO SPARGE

TIME ADDITIONS SOLUTION DATA EXTRACTION (%)

(Hours) Ore Water NaCN Lime Oxygen pH NaCN Au Cu Gold Copper

(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.31

0 2.45 1.38 5.6 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 10.1 10.63 0.085 0.590 5.20 46.52 0.76

2 0.00 0.00 10.0 10.66 0.078 0.675 8.74 53.22 1.28

4 0.00 0.00 9.0 10.74 0.075 0.755 13.8 59.53 2.02

6 0.00 0.00 8.7 10.79 0.070 0.820 17.7 64.65 2.60

8 0.00 0.00 9.0 10.84 0.060 0.850 22.7 67.02 3.33

12 0.00 0.00 9.4 10.81 0.053 0.880 29.1 69.39 4.27

24 0.00 0.00 9.2 10.64 0.030 0.975 48.7 76.88 7.14


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.24 720 23.12 518 1554000 92.86

Solution (mls) 2455.0 0.975 2394 76.88 48.7 119559 7.14

Total 3114 100.00 1673559 100.00

Calculated Head 1.04 558

Assay Head 1.06 / 1.02 482

COMMENTS :

1. NaCN addition : 0.82 (Kg/t)

2. NaCN consumption : 0.51 (Kg/t)

3. Lime Addition : 0.46 (Kg/t)

4. Perth tap water used : 1.000 (SG)

5. Grind Size P 80 : 125 m)

6. Leach test conducted in mechanically stirred,

baffled agitation vat leach.

7. Evaporation losses made up prior to sampling

at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


SPARGE OPTIMISATION CYANIDATION TIME LEACH TESTWORK - AIR SPARGE



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.30

0 2.45 1.39 6.0 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 9.8 10.63 0.088 0.595 4.56 50.91 0.68

2 0.00 0.00 9.7 10.65 0.085 0.725 8.62 62.03 1.28

4 0.00 0.00 9.0 10.66 0.075 0.775 14.9 66.31 2.21

6 0.00 0.00 8.8 10.68 0.070 0.815 19.0 69.73 2.81

8 0.00 0.00 9.3 10.76 0.063 0.850 23.6 72.72 3.50

12 0.00 0.00 9.5 10.75 0.058 0.865 29.7 74.01 4.40

24 0.00 0.00 9.3 10.44 0.028 0.900 49.3 77.00 7.30


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.22 660 23.00 512 1536000 92.70

Solution (mls) 2455.0 0.900 2210 77.00 49.3 121032 7.30

Total 2870 100.00 1657032 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


SPARGE OPTIMISATION CYANIDATION TIME LEACH TESTWORK - OXYGEN SPARGE



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.28

0 2.45 1.35 8.3 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 29.4 10.61 0.083 0.710 7.36 54.90 1.07

2 0.00 0.00 30.1 10.64 0.083 0.775 11.6 59.93 1.68

4 0.00 0.00 24.1 10.68 0.065 0.810 18.3 62.63 2.66

6 0.00 0.00 21.1 10.75 0.063 0.850 24.4 65.72 3.54

8 0.00 0.00 21.5 10.81 0.053 0.870 28.5 67.27 4.14

12 1.35 0.00 20.7 10.80 0.045 0.900 35.2 69.59 5.11

24 0.00 0.00 20.6 11.04 0.065 1.00 65.3 77.32 9.48


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.24 720 22.68 510 1530000 90.52

Solution (mls) 2455.0 1.00 2455 77.32 65.3 160312 9.48

Total 3175 100.00 1690312 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


SPARGE OPTIMISATION CYANIDATION TIME LEACH TESTWORK - NO SPARGE



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.30

0 2.45 1.39 5.5 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 10.6 10.63 0.085 0.590 5.30 48.17 0.79

2 0.00 0.00 10.2 10.67 0.080 0.675 8.74 55.10 1.31

4 0.00 0.00 9.3 10.76 0.075 0.750 14.3 61.23 2.14

6 0.00 0.00 9.8 10.81 0.063 0.770 18.6 62.86 2.78

8 0.00 0.00 9.6 10.87 0.058 0.795 22.6 64.90 3.38

12 1.28 0.00 9.4 10.83 0.048 0.835 30.9 68.17 4.62

24 0.00 0.00 9.6 11.07 0.070 0.950 58.3 77.55 8.71


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.23 675 22.45 500 1500000 91.29

Solution (mls) 2455.0 0.950 2332 77.55 58.3 143127 8.71

Total 3007 100.00 1643127 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


SPARGE OPTIMISATION CYANIDATION TIME LEACH TESTWORK -AIR SPARGE



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.30

0 2.45 1.40 5.7 11.08 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 9.8 10.74 0.088 0.625 5.40 46.88 0.78

2 0.00 0.00 9.7 10.77 0.080 0.755 9.30 56.63 1.34

4 0.00 0.00 9.0 10.81 0.073 0.830 15.2 62.25 2.18

6 0.00 0.00 9.5 10.83 0.065 0.880 20.6 66.00 2.96

8 0.00 0.00 9.4 10.88 0.060 0.910 24.6 68.25 3.53

12 0.00 0.00 9.4 10.81 0.053 0.945 31.2 70.88 4.48

24 0.00 0.00 9.7 10.55 0.018 1.04 53.5 78.00 7.68


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.24 720 22.00 526 1578000 92.32

Solution (mls) 2455.0 1.04 2553 78.00 53.5 131343 7.68

Total 3273 100.00 1709343 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


SPARGE OPTIMISATION CYANIDATION TIME LEACH TESTWORK -OXYGEN SPARGE



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.32

0 2.45 1.40 5.2 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 38.8 10.67 0.085 0.730 8.06 61.66 1.18

2 0.00 0.00 39.5 10.69 0.078 0.770 13.4 65.04 1.96

4 0.00 0.00 31.5 10.75 0.065 0.805 20.4 68.00 2.99

6 0.00 0.00 29.3 10.79 0.063 0.810 25.5 68.42 3.73

8 0.00 0.00 29.9 10.84 0.055 0.825 30.8 69.69 4.51

12 1.23 0.00 32.1 10.81 0.050 0.845 39.7 71.38 5.81

24 0.00 0.00 38.9 10.94 0.075 0.915 69.8 77.29 10.22


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.22 660 22.71 502 1506000 89.78

Solution (mls) 2455.0 0.915 2246 77.29 69.8 171359 10.22

Total 2906 100.00 1677359 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


CYANIDE DOSAGE OPTIMISATION CYANIDATION TIME LEACH TESTWORK - 0.050% NaCN



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.32

0 1.23 1.40 6.9 11.00 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 9.9 10.64 0.040 0.540 2.16 47.51 0.32

2 0.00 0.00 9.6 10.63 0.040 0.645 7.70 56.75 1.13

4 0.00 0.00 8.8 10.59 0.033 0.740 13.5 65.11 1.98

6 0.61 0.00 9.4 10.60 0.025 0.780 16.5 68.62 2.42

8 0.00 0.00 9.6 10.73 0.045 0.805 21.0 70.82 3.08

12 0.00 0.00 9.8 10.70 0.040 0.850 27.1 74.78 3.98

24 0.00 0.00 9.2 10.49 0.020 0.880 47.8 77.42 7.02


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.21 630.00 22.58 518 1554000 92.98

Solution (mls) 2455.0 0.880 2160 77.42 47.8 117349 7.02

Total 2790 100.00 1671349 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.30

0 0.61 1.42 7.4 11.00 0.025 0.000 0.00 0.00 0.00

1 0.00 0.00 9.8 10.65 0.023 0.440 4.70 36.43 0.68

2 0.00 0.00 9.8 10.56 0.018 0.595 8.08 49.27 1.18

4 0.37 0.00 8.9 10.43 0.010 0.680 11.8 56.30 1.72

6 0.00 0.00 9.0 10.47 0.025 0.725 15.7 60.03 2.29

8 0.00 0.00 9.6 10.52 0.018 0.755 20.2 62.51 2.94

12 0.37 0.00 9.4 10.40 0.010 0.795 25.5 65.83 3.71

24 0.00 0.00 9.4 10.30 0.008 0.890 43.9 73.69 6.39


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.26 780 26.31 526 1578000 93.61

Solution (mls) 2455.0 0.890 2185 73.69 43.9 107775 6.39

Total 2965 100.00 1685775 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.32

0 0.37 1.41 8.4 11.00 0.015 0.000 0.00 0.00 0.00

1 0.12 0.00 9.5 10.58 0.010 0.330 5.22 27.49 0.77

2 0.00 0.00 9.6 10.48 0.015 0.485 8.08 40.40 1.19

4 0.12 0.00 8.3 10.33 0.010 0.630 12.8 52.48 1.88

6 0.12 0.00 8.9 10.32 0.010 0.685 15.4 57.06 2.27

8 0.00 0.00 9.6 10.36 0.015 0.700 18.6 58.31 2.74

12 0.12 0.00 9.4 10.22 0.010 0.730 23.5 60.81 3.46

24 0.00 0.00 9.5 9.60 0.008 0.785 39.2 65.39 5.77


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.34 1020 34.61 524 1572000 94.23

Solution (mls) 2455.0 0.785 1927 65.39 39.2 96236 5.77

Total 2947 100.00 1668236 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.32

0 1.23 1.45 6.7 11.00 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 10.6 10.64 0.040 0.495 6.04 43.47 0.88

2 0.00 0.00 10.1 10.57 0.035 0.620 9.00 54.44 1.31

4 0.00 0.00 9.1 10.55 0.030 0.715 14.3 62.78 2.08

6 0.00 0.00 9.1 10.51 0.028 0.765 18.3 67.17 2.66

8 0.73 0.00 9.8 10.51 0.020 0.790 22.5 69.37 3.27

12 0.00 0.00 9.3 10.69 0.038 0.810 28.9 71.13 4.20

24 0.00 0.00 9.0 10.50 0.015 0.870 50.3 76.39 7.31


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.22 660 23.61 522 1566000 92.69

Solution (mls) 2455.0 0.870 2136 76.39 50.3 123487 7.31

Total 2796 100.00 1689487 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.33

0 0.61 1.41 6.3 11.00 0.025 0.000 0.00 0.00 0.00

1 0.00 0.00 10.3 10.58 0.018 0.530 4.72 39.36 0.69

2 0.00 0.00 9.3 10.46 0.018 0.640 7.12 47.53 1.04

4 0.37 0.00 8.8 10.38 0.010 0.725 12.5 53.84 1.83

6 0.00 0.00 8.9 10.43 0.025 0.765 15.6 56.81 2.28

8 0.00 0.00 9.3 10.46 0.023 0.810 19.2 60.15 2.81

12 0.37 0.00 9.5 10.36 0.018 0.860 24.9 63.86 3.64

24 0.00 0.00 9.4 9.83 0.010 0.980 41.0 72.78 6.00


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.30 900 27.22 526 1578000 94.00

Solution (mls) 2455.0 0.980 2406 72.78 41.0 100655 6.00

Total 3306 100.00 1678655 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.33

0 0.37 1.40 7.0 11.00 0.015 0.000 0.00 0.00 0.00

1 0.12 0.00 8.7 10.62 0.010 0.315 4.62 23.39 0.69

2 0.00 0.00 8.9 10.49 0.018 0.495 6.94 36.76 1.04

4 0.12 0.00 8.5 10.37 0.010 0.635 11.6 47.16 1.73

6 0.00 0.00 8.6 10.33 0.013 0.695 14.6 51.61 2.18

8 0.12 0.00 9.2 10.32 0.010 0.735 18.8 54.58 2.81

12 0.00 0.00 9.8 10.23 0.013 0.795 23.4 59.04 3.50

24 0.00 0.00 9.3 9.66 0.008 0.870 38.4 64.61 5.74


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.39 1170 35.39 516 1548000 94.26

Solution (mls) 2455.0 0.870 2136 64.61 38.4 94272 5.74

Total 3306 100.00 1642272 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


PULP DENSITY OPTIMISATION CYANIDATION TIME LEACH TESTWORK - 50% SOLIDS



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 3000.0 8.22

0 3.00 1.55 2.3 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 7.9 10.73 0.090 0.405 5.30 42.63 0.97

2 0.00 0.00 8.6 10.81 0.085 0.550 8.80 57.89 1.61

4 0.00 0.00 8.0 10.80 0.075 0.595 14.1 62.63 2.58

6 0.00 0.00 8.1 10.87 0.070 0.640 18.2 67.37 3.33

8 0.00 0.00 8.8 10.81 0.068 0.660 21.5 69.47 3.93

12 0.00 0.00 8.8 10.75 0.063 0.700 26.6 73.68 4.86

24 0.00 0.00 8.8 10.60 0.035 0.725 41.2 76.32 7.53


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.23 675 23.68 506 1518000 92.47

Solution (mls) 3000.0 0.725 2175 76.32 41.2 123600 7.53

Total 2850 100.00 1641600 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.23

0 2.00 1.54 3.3 11.02 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 7.7 10.81 0.085 0.750 8.76 50.08 1.05

2 0.00 0.00 8.0 10.86 0.078 0.915 14.5 61.10 1.73

4 0.00 0.00 7.9 10.82 0.070 0.980 22.9 65.44 2.73

6 0.00 0.00 8.1 10.86 0.065 1.010 28.7 67.45 3.43

8 0.00 0.00 8.8 10.86 0.063 1.04 33.4 69.45 3.99

12 0.00 0.00 8.2 10.83 0.058 1.08 38.4 72.12 4.58

24 0.00 0.00 8.9 10.64 0.030 1.13 54.9 75.46 6.55


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.25 735 24.54 522 1566000 93.45

Solution (mls) 2000.0 1.13 2260 75.46 54.9 109800 6.55

Total 2995 100.00 1675800 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 1615.0 8.23

0 1.62 1.22 1.3 11.04 0.100 0.00 0.00 0.00 0.00

1 0.00 0.00 8.0 10.55 0.078 0.835 9.08 48.87 0.88

2 0.00 0.00 8.4 10.59 0.073 1.14 15.9 66.72 1.55

4 0.00 0.00 7.8 10.59 0.063 1.19 25.9 69.64 2.52

6 0.00 0.00 7.8 10.66 0.055 1.22 32.6 71.40 3.17

8 0.89 0.00 8.7 10.64 0.045 1.24 39.4 72.57 3.84

12 0.00 0.00 8.7 10.68 0.098 1.28 47.7 74.91 4.64

24 0.00 0.00 8.8 10.36 0.043 1.30 79.9 76.08 7.78


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.22 660 23.92 510 1530000 92.22

Solution (mls) 1615.0 1.30 2100 76.08 79.9 129039 7.78

Total 2760 100.00 1659039 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 3000.0 8.24

0 3.00 1.47 2.0 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 7.3 10.70 0.088 0.425 4.32 48.02 0.80

2 0.00 0.00 8.2 10.74 0.085 0.530 8.44 59.89 1.57

4 0.00 0.00 7.9 10.77 0.078 0.595 13.1 67.23 2.44

6 0.00 0.00 8.0 10.81 0.075 0.620 16.9 70.06 3.14

8 0.00 0.00 8.8 10.85 0.068 0.640 20.2 72.32 3.76

12 0.00 0.00 8.7 10.84 0.063 0.655 24.7 74.01 4.60

24 0.00 0.00 8.8 10.36 0.040 0.665 37.5 75.14 6.98


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.22 660 24.86 500 1500000 93.02

Solution (mls) 3000.0 0.665 1995 75.14 37.5 112500 6.98

Total 2655 100.00 1612500 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.24

0 2.00 1.42 6.2 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 8.7 10.76 0.085 0.700 7.88 46.67 0.93

2 0.00 0.00 8.9 10.78 0.078 0.860 13.3 57.33 1.56

4 0.00 0.00 8.3 10.79 0.073 0.910 21.9 60.67 2.57

6 0.00 0.00 8.3 10.81 0.060 0.955 28.1 63.67 3.30

8 0.00 0.00 8.9 10.81 0.053 0.990 32.9 66.00 3.87

12 1.04 0.00 8.9 10.75 0.048 1.050 39.6 70.00 4.65

24 0.00 0.00 8.9 10.77 0.063 1.14 71.2 76.00 8.36


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.24 720 24.00 520 1560000 91.64

Solution (mls) 2000.0 1.14 2280 76.00 71.2 142400 8.36

Total 3000 100.00 1702400 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 1615.0 8.25

0 1.62 1.37 5.8 11.00 0.100 0.00 0.00 0.00 0.00

1 0.00 0.00 8.6 10.73 0.080 1.09 9.62 52.29 0.93

2 0.00 0.00 8.8 10.74 0.073 1.40 16.4 67.17 1.59

4 0.00 0.00 8.3 10.79 0.063 1.48 27.8 71.00 2.69

6 0.84 0.00 8.3 10.81 0.048 1.54 37.4 73.88 3.62

8 0.00 0.00 8.8 10.91 0.100 1.57 41.1 75.32 3.98

12 0.00 0.00 8.8 10.90 0.095 1.60 53.1 76.76 5.14

24 0.00 0.00 8.8 10.70 0.040 1.62 85.5 77.72 8.28


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.25 750 22.28 510 1530000 91.72

Solution (mls) 1615.0 1.62 2616 77.72 85.5 138083 8.28

Total 3366 100.00 1668083 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


OPTIMISATION CYANIDATION TIME LEACH TESTWORK - 200g/t LEAD NITRATE ADDITION


(Hours) Ore Water NaCN Lime Pb(NO3)2 Oxygen pH NaCN Au Cu Gold Copper

(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.23

0 2.45 1.42 0.60 4.4 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 8.8 10.55 0.083 0.770 4.04 60.85 0.60

2 0.00 0.00 9.0 10.57 0.075 0.815 5.04 64.40 0.75

4 0.00 0.00 8.2 10.59 0.070 0.855 6.32 67.56 0.94

6 0.00 0.00 8.2 10.63 0.068 0.870 6.80 68.75 1.01

8 0.00 0.00 8.8 10.67 0.065 0.885 6.90 69.93 1.03

12 0.00 0.00 8.9 10.63 0.063 0.910 7.46 71.91 1.11

24 0.00 0.00 8.6 10.53 0.043 0.960 10.2 75.86 1.52


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.25 750 24.14 540 1620000 98.48

Solution (mls) 2455.0 0.960 2357 75.86 10.2 25041 1.52

Total 3107 100.00 1645041 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.24

0 2.45 1.47 0.60 5.0 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 8.4 10.65 0.085 0.855 4.30 63.18 0.64

2 0.00 0.00 8.9 10.66 0.078 0.890 5.36 65.77 0.79

4 0.00 0.00 8.3 10.71 0.073 0.935 6.88 69.09 1.02

6 0.00 0.00 8.4 10.78 0.070 0.965 7.02 71.31 1.04

8 0.00 0.00 8.9 10.82 0.068 0.985 7.30 72.79 1.08

12 0.00 0.00 9.0 10.84 0.063 1.03 8.44 76.11 1.25

24 0.00 0.00 8.6 10.67 0.035 1.06 11.9 78.33 1.76


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.24 720 21.67 544 1632000 98.24

Solution (mls) 2455.0 1.06 2602 78.33 11.9 29215 1.76

Total 3322 100.00 1661215 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3878


GRIND P80 : 125 µm


DATE AUGUST 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.23

0 2.45 1.42 0.60 4.4 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 8.8 10.55 0.083 0.770 4.04 60.85 0.60

2 0.00 0.00 9.0 10.57 0.075 0.815 5.04 64.40 0.75

4 0.00 0.00 8.2 10.59 0.070 0.855 6.32 67.56 0.94

6 0.00 0.00 8.2 10.63 0.068 0.870 6.80 68.75 1.01

8 0.00 0.00 8.8 10.67 0.065 0.885 6.90 69.93 1.03

12 0.00 0.00 8.9 10.63 0.063 0.910 7.46 71.91 1.11

24 0.00 0.00 8.6 10.53 0.043 0.960 10.2 75.86 1.52


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.25 750 24.14 540 1620000 98.48

Solution (mls) 2455.0 0.960 2357 75.86 10.2 25041 1.52

Total 3107 100.00 1645041 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :





5. Grind Size P 80 : 125 (mm)




at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3879


GRIND P80 : 125 µm


DATE AUGUST 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2455.0 8.24

0 2.45 1.47 0.60 5.0 11.00 0.100 0.000 0.00 0.00 0.00

1 0.00 0.00 8.4 10.65 0.085 0.855 4.30 63.18 0.64

2 0.00 0.00 8.9 10.66 0.078 0.890 5.36 65.77 0.79

4 0.00 0.00 8.3 10.71 0.073 0.935 6.88 69.09 1.02

6 0.00 0.00 8.4 10.78 0.070 0.965 7.02 71.31 1.04

8 0.00 0.00 8.9 10.82 0.068 0.985 7.30 72.79 1.08

12 0.00 0.00 9.0 10.84 0.063 1.03 8.44 76.11 1.25

24 0.00 0.00 8.6 10.67 0.035 1.06 11.9 78.33 1.76


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.24 720 21.67 544 1632000 98.24

Solution (mls) 2455.0 1.06 2602 78.33 11.9 29215 1.76

Total 3322 100.00 1661215 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3977


GRIND P80 : 125 µm


DATE SEPTEMBER 2011

OPTIMISATION CYANIDATION TIME LEACH TESTWORK - 50g/t LEAD NITRATE ADDN - 4 HRS PRE-CONDITIONING



(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.23

Start of Pre-Conditioning 1.13 0.15 7.6 11.02

1 0.35 7.5 10.22

2 0.23 7.9 10.55

3 0.22 7.8 10.65

4 0.00 7.6 10.72

0 1.00 0.00 7.6 10.72 0.050 0.00 0.0 0.00 0.00

1 0.00 0.00 7.9 10.68 0.040 1.02 10.7 59.13 1.35

2 0.00 0.00 8.3 10.71 0.035 1.11 13.5 64.35 1.70

4 0.00 0.00 7.7 10.66 0.030 1.19 17.7 68.99 2.23

6 0.00 0.00 8.7 10.67 0.028 1.22 20.9 70.72 2.63

8 0.60 0.00 8.9 10.60 0.020 1.24 24.0 71.88 3.02

12 0.00 0.00 8.5 10.71 0.040 1.28 28.1 74.20 3.54

24 0.00 0.00 8.1 10.28 0.010 1.38 38.1 80.00 4.80


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.23 690 20.00 504 1512000 95.20

Solution (mls) 2000.0 1.380 2760 80.00 38.1 76200 4.80

Total 3450 100.00 1588200 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3978


GRIND P80 : 125 µm


DATE SEPTEMBER 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.25


1 0.18 7.8 10.64

2 0.12 7.8 10.70

3 0.15 7.9 10.72

4 0.00 7.8 10.75

0 1.00 0.00 7.8 10.75 0.050 0.000 0.0 0.00 0.00

1 0.00 0.00 8.0 10.72 0.040 0.910 10.1 60.87 1.17

2 0.00 0.00 8.4 10.75 0.040 0.985 13.3 65.89 1.54

4 0.00 0.00 7.8 10.72 0.033 1.05 17.8 70.23 2.05

6 0.50 0.00 8.5 10.68 0.025 1.10 21.5 73.58 2.48

8 0.00 0.00 8.5 10.73 0.050 1.13 24.7 75.59 2.85

12 0.00 0.00 8.6 10.81 0.045 1.16 28.8 77.59 3.32

24 0.00 0.00 7.4 10.78 0.025 1.21 41.2 80.94 4.76


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.19 570 19.06 550 1650000 95.24

Solution (mls) 2000.0 1.210 2420 80.94 41.2 82400 4.76

Total 2990 100.00 1732400 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3979


GRIND P80 : 125 µm


DATE SEPTEMBER 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.27


1 0.39 7.7 9.89

2 0.27 7.4 10.52

3 0.12 8.1 10.71

4 0.00 8.0 10.68

0 1.00 0.00 8.0 10.68 0.050 0.00 0.00 0.00 0.00

1 0.00 0.00 8.5 10.67 0.040 1.00 9.24 57.80 1.12

2 0.00 0.00 8.4 10.69 0.035 1.08 12.1 62.43 1.46

4 0.00 0.00 7.7 10.68 0.030 1.14 16.0 65.90 1.94

6 0.00 0.00 8.3 10.66 0.030 1.19 19.1 68.79 2.31

8 0.54 0.00 8.5 10.68 0.023 1.23 21.8 71.10 2.64

12 0.00 0.00 8.6 10.81 0.080 1.30 24.4 75.14 2.95

24 0.00 0.00 8.2 10.80 0.025 1.37 34.2 79.19 4.14


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.24 720 20.81 528 1584000 95.86

Solution (mls) 2000.0 1.370 2740 79.19 34.2 68400 4.14

Total 3460 100.00 1652400 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3980


GRIND P80 : 125 µm


DATE SEPTEMBER 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.26


1 0.40 7.4 9.84

2 0.20 7.6 10.45

3 0.17 7.9 10.61

4 0.00 7.8 10.63

0 1.00 0.00 7.8 10.63 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 8.2 10.62 0.040 0.895 9.08 60.47 0.91

2 0.00 0.00 8.4 10.63 0.040 0.950 11.2 64.19 1.13

4 0.00 0.00 7.8 10.59 0.033 1.01 15.2 68.24 1.53

6 0.00 0.00 8.1 10.49 0.028 1.05 18.1 70.95 1.82

8 0.50 0.00 8.8 10.56 0.025 1.09 20.0 73.65 2.01

12 0.00 0.00 8.5 10.64 0.050 1.12 22.9 75.68 2.30

24 0.00 0.00 7.9 10.66 0.033 1.15 30.6 77.70 3.08


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.22 660 22.30 642 1926000 96.92

Solution (mls) 2000.0 1.150 2300 77.70 30.6 61200 3.08

Total 2960 100.00 1987200 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3985


GRIND P80 : 125 µm


DATE SEPTEMBER 2011

OPTIMISATION CYANIDATION TIME LEACH TESTWORK - 50g/t LEAD NITRATE ADDN - NO PRE-CONDITIONING



(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.26

0 1.00 1.15 0.15 7.2 10.93 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 6.8 10.47 0.038 0.835 8.36 56.23 0.64

2 0.00 0.00 7.9 10.46 0.035 0.945 11.8 63.64 0.90

4 0.50 0.00 8.2 10.37 0.025 1.02 18.7 68.69 1.42

6 0.00 0.00 8.0 10.47 0.043 1.06 23.7 71.38 1.80

8 0.00 0.00 8.8 10.50 0.033 1.09 28.2 73.40 2.14

12 0.00 0.00 8.7 10.56 0.030 1.11 34.4 74.75 2.61

24 0.00 0.00 8.8 10.38 0.015 1.14 46.5 76.77 3.53


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.23 690 23.23 846 2538000 96.47

Solution (mls) 2000.0 1.140 2280 76.77 46.5 93000 3.53

Total 2970 100.00 2631000 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3986


GRIND P80 : 125 µm


DATE SEPTEMBER 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.28

0 1.00 1.15 0.15 7.8 10.89 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.5 10.46 0.035 0.920 8.70 59.16 0.83

2 0.00 0.00 7.7 10.42 0.033 1.02 12.4 65.59 1.18

4 0.50 0.00 7.9 10.39 0.025 1.10 18.1 70.74 1.72

6 0.00 0.00 8.0 10.49 0.045 1.15 22.6 73.95 2.14

8 0.00 0.00 8.7 10.55 0.035 1.19 28.6 76.53 2.71

12 0.00 0.00 8.8 10.58 0.030 1.20 34.2 77.17 3.24

24 0.00 0.00 8.0 10.28 0.010 1.21 46.4 77.81 4.40


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.23 690 22.19 672 2016000 95.60

Solution (mls) 2000.0 1.210 2420 77.81 46.4 92800 4.40

Total 3110 100.00 2108800 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3987


GRIND P80 : 125 µm


DATE SEPTEMBER 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.26

0 1.00 1.20 0.30 7.6 11.03 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.5 10.41 0.038 0.930 7.38 60.78 0.76

2 0.00 0.00 7.9 10.33 0.030 0.995 9.26 65.03 0.96

4 0.00 0.00 8.0 10.30 0.030 1.09 14.6 71.24 1.51

6 0.50 0.00 8.1 10.28 0.025 1.13 17.4 73.86 1.80

8 0.00 0.00 8.7 10.33 0.045 1.16 19.8 75.82 2.05

12 0.00 0.00 8.5 10.40 0.038 1.19 24.7 77.78 2.56

24 0.00 0.00 8.3 10.27 0.020 1.20 32.3 78.43 3.35


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.22 660 21.57 622 1866000 96.65

Solution (mls) 2000.0 1.200 2400 78.43 32.3 64600 3.35

Total 3060 100.00 1930600 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575


TEST No WH3988


GRIND P80 : 125 µm


DATE SEPTEMBER 2011




(g) (g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.20

0 1.00 1.21 0.30 7.2 10.99 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.0 10.36 0.038 0.870 6.68 60.21 0.55

2 0.00 0.00 7.8 10.33 0.030 0.960 10.1 66.44 0.84

4 0.00 0.00 8.0 10.29 0.030 1.04 12.8 71.97 1.06

6 0.50 0.00 8.2 10.38 0.025 1.07 16.0 74.05 1.32

8 0.00 0.00 9.0 10.49 0.040 1.10 18.3 76.12 1.51

12 0.00 0.00 8.9 10.55 0.038 1.12 21.8 77.51 1.80

24 0.00 0.00 7.7 10.39 0.018 1.13 29.1 78.20 2.41


Gold


(ppm) (mg) (%) (ppm) (mg) (%)

Solids (g) 3000.0 0.21 630 21.80 786 2358000 97.59

Solution (mls) 2000.0 1.130 2260 78.20 29.1 58200 2.41

Total 2890 100.00 2416200 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER

PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH3981SAMPLE PLANT FEED MASTER COMPOSITEGRIND P80 : 125 µmWATER PERTH TAP WATERDATE SEPTEMBER 2011

OPTIMISATION CYANIDATION TIME LEACH TESTWORK - LIME IN MILL - NO-CONDITIONING



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 9.56

0 1.00 0.42 7.5 10.99 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.6 10.57 0.038 0.770 9.38 43.50 0.98

2 0.00 0.00 8.2 10.57 0.033 0.885 13.3 50.00 1.38

4 0.00 0.00 7.8 10.50 0.030 1.04 20.1 58.76 2.09

6 0.60 0.00 8.3 10.53 0.020 1.11 26.6 62.71 2.77

8 0.00 0.00 8.8 10.60 0.048 1.16 30.4 65.54 3.16

12 0.00 0.00 8.5 10.63 0.035 1.19 37.4 67.23 3.89

24 0.70 0.00 8.2 10.43 0.015 1.27 54.5 71.75 5.67

48 0.00 0.00 9.4 10.28 0.015 1.41 85.1 79.66 8.85


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.24 720 20.34 584 1752000 91.15

Solution (mls) 2000.0 1.410 2820 79.66 85.1 170200 8.85

Total 3540 100.00 1922200 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


OPTIMISATION CYANIDATION TIME LEACH TESTWORK - LIME IN MILL - NO-CONDITIONING



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 9.75

0 1.00 0.42 7.2 11.09 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.4 10.59 0.040 0.795 8.16 43.32 1.01

2 0.00 0.00 8.7 10.63 0.033 0.940 12.1 51.23 1.49

4 0.00 0.00 7.7 10.53 0.030 1.10 19.2 59.95 2.37

6 0.50 0.00 8.3 10.53 0.025 1.18 24.9 64.31 3.07

8 0.00 0.00 8.8 10.56 0.040 1.23 30.5 67.03 3.76

12 0.00 0.00 8.6 10.63 0.033 1.29 38.5 70.30 4.74

24 0.74 0.00 7.2 10.30 0.013 1.35 51.8 73.57 6.38

48 0.00 0.00 9.6 10.14 0.010 1.46 76.5 79.56 9.43


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.25 750 20.44 490 1470000 90.57

Solution (mls) 2000.0 1.460 2920 79.56 76.5 153000 9.43

Total 3670 100.00 1623000 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


OPTIMISATION CYANIDATION TIME LEACH TESTWORK - LIME IN MILL - 4 HRS PRE-CONDITIONING



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 9.59

Start of Pre-Conditioning 0.66 5.4 11.22

1 0.24 6.2 10.73

2 0.10 6.8 10.93

3 0.08 7.3 10.89

4 0.00 7.6 10.81

0 1.00 0.00 7.6 10.81 0.050 0.000 0.0 0.00 0.00

1 0.00 0.00 7.7 10.82 0.040 0.850 10.3 50.75 1.18

2 0.00 0.00 8.4 10.82 0.040 0.945 13.7 56.42 1.57

4 0.00 0.00 7.5 10.72 0.033 1.01 19.3 60.30 2.22

6 0.00 0.00 8.2 10.69 0.030 1.06 23.2 63.28 2.67

8 0.00 0.00 7.9 10.68 0.028 1.08 27.1 64.48 3.11

12 0.54 0.00 8.3 10.66 0.023 1.11 32.8 66.27 3.77

24 0.00 0.00 8.3 10.71 0.030 1.18 45.5 70.45 5.23

48 0.00 0.00 9.2 9.59 0.015 1.33 66.4 79.40 7.63


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.23 690 20.60 536 1608000 92.37

Solution (mls) 2000.0 1.330 2660 79.40 66.4 132800 7.63

Total 3350 100.00 1740800 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


OPTIMISATION CYANIDATION TIME LEACH TESTWORK - LIME IN MILL - 4 HRS PRE-CONDITIONING



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 9.56


1 0.40 7.1 10.49

2 0.15 7.8 10.88

3 0.10 7.5 10.89

4 0.00 7.6 10.79

0 1.00 0.00 7.6 10.79 0.050 0.000 0.0 0.00 0.00

1 0.00 0.00 8.0 10.75 0.043 0.820 10.4 51.74 1.22

2 0.00 0.00 8.2 10.78 0.040 0.915 14.3 57.73 1.68

4 0.00 0.00 6.7 10.75 0.038 0.985 19.1 62.15 2.24

6 0.00 0.00 8.0 10.67 0.033 1.01 23.1 63.72 2.71

8 0.00 0.00 7.9 10.67 0.030 1.05 26.4 66.25 3.09

12 0.54 0.00 8.3 10.66 0.023 1.08 31.2 68.14 3.66

24 0.00 0.00 7.1 10.67 0.035 1.15 42.2 72.56 4.95

48 0.00 0.00 9.1 9.96 0.015 1.24 58.3 78.23 6.83


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.23 690 21.77 530 1590000 93.17

Solution (mls) 2000.0 1.240 2480 78.23 58.3 116600 6.83

Total 3170 100.00 1706600 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


OPTIMISATION CYANIDATION TIME LEACH TESTWORK - LIME IN LEACH - 2 HRS PRE-CONDITIONING



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.28


1 0.30 7.2 10.13

2 0.00 8.1 10.38

0 1.00 0.00 8.1 10.38 0.050 0.000 0.0 0.00 0.00

1 0.00 0.00 8.4 10.43 0.040 0.820 9.8 50.00 0.96

2 0.00 0.00 8.2 10.52 0.035 0.955 13.3 58.23 1.30

4 0.00 0.00 6.8 10.49 0.028 1.10 19.4 67.07 1.90

6 0.50 0.00 8.1 10.46 0.025 1.13 24.1 68.90 2.36

8 0.00 0.00 8.2 10.52 0.040 1.15 29.3 70.12 2.87

12 0.00 0.00 8.4 10.58 0.035 1.19 36.6 72.56 3.58

24 0.70 0.00 7.3 10.46 0.015 1.23 52.4 75.00 5.13

48 0.00 0.00 9.3 10.51 0.023 1.28 76.3 78.05 7.47


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.24 720 21.95 630 1890000 92.53

Solution (mls) 2000.0 1.280 2560 78.05 76.3 152600 7.47

Total 3280 100.00 2042600 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.30


1 0.40 6.8 10.02

2 0.00 7.3 10.51

0 1.00 0.00 7.3 10.51 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.0 10.53 0.038 0.770 8.22 42.42 0.91

2 0.00 0.00 8.0 10.56 0.033 0.895 11.9 49.31 1.32

4 0.00 0.00 7.0 10.55 0.028 1.07 18.8 58.95 2.09

6 0.54 0.00 8.1 10.54 0.023 1.14 23.3 62.81 2.59

8 0.00 0.00 8.3 10.64 0.043 1.20 28.2 66.12 3.13

12 0.00 0.00 8.5 10.69 0.030 1.25 36.6 68.87 4.06

24 0.70 0.00 7.4 10.56 0.015 1.32 50.8 72.73 5.64

48 0.00 0.00 9.2 10.67 0.023 1.41 75.5 77.69 8.38


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.27 810 22.31 550 1650000 91.62

Solution (mls) 2000.0 1.410 2820 77.69 75.5 151000 8.38

Total 3630 100.00 1801000 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.24


1 0.27 7.4 10.13

2 0.21 7.6 10.44

3 0.21 7.6 10.60

4 0.00 7.5 10.73

0 1.00 0.00 7.5 10.73 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.4 10.68 0.043 0.870 9.74 53.54 1.15

2 0.00 0.00 8.6 10.74 0.035 0.995 13.5 61.23 1.59

4 0.00 0.00 7.2 10.67 0.030 1.06 18.9 65.23 2.23

6 0.00 0.00 8.1 10.61 0.028 1.10 23.8 67.69 2.81

8 0.60 0.00 8.5 10.60 0.020 1.14 28.4 70.15 3.35

12 0.00 0.00 8.4 10.69 0.050 1.17 33.6 72.00 3.96

24 0.00 0.00 7.8 10.66 0.028 1.23 49.4 75.69 5.82

48 0.00 0.00 9.5 10.04 0.008 1.31 68.3 80.62 8.05


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.21 630 19.38 520 1560000 91.95

Solution (mls) 2000.0 1.310 2620 80.62 68.3 136600 8.05

Total 3250 100.00 1696600 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER





(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.23


1 0.30 6.7 10.22

2 0.16 7.4 10.55

3 0.18 7.5 10.65

4 0.00 7.1 10.72

0 1.00 0.00 7.1 10.72 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.5 10.68 0.040 0.840 9.44 52.17 1.05

2 0.00 0.00 8.4 10.71 0.035 0.960 13.6 59.63 1.51

4 0.00 0.00 7.6 10.66 0.030 1.06 19.8 65.84 2.21

6 0.00 0.00 8.2 10.67 0.028 1.09 24.7 67.70 2.75

8 0.60 0.00 8.5 10.60 0.020 1.11 28.3 68.94 3.15

12 0.00 0.00 8.6 10.71 0.040 1.14 36.8 70.81 4.10

24 0.00 0.00 7.2 10.70 0.033 1.19 49.7 73.91 5.54

48 0.00 0.00 9.4 10.28 0.010 1.28 66.9 79.50 7.45


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.22 660 20.50 554 1662000 92.55

Solution (mls) 2000.0 1.280 2560 79.50 66.9 133800 7.45

Total 3220 100.00 1795800 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


OPTIMISATION CYANIDATION TIME LEACH TESTWORK - LIME IN LEACH - NO-CONDITIONING



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.35

0 1.00 1.10 7.6 11.00 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 7.6 10.32 0.038 0.710 7.16 49.65 0.83

2 0.00 0.00 8.1 10.29 0.035 0.820 10.1 57.34 1.17

4 0.50 0.00 7.8 10.20 0.025 0.930 17.8 65.03 2.07

6 0.00 0.00 8.4 10.27 0.045 1.00 23.9 69.79 2.78

8 0.00 0.00 8.8 10.27 0.035 1.03 30.5 72.03 3.54

12 0.00 0.00 8.6 10.33 0.028 1.07 36.8 74.83 4.28

24 0.74 0.00 7.8 10.22 0.013 1.09 52.6 76.22 6.11

48 0.00 0.00 9.9 10.38 0.015 1.13 74.5 79.02 8.66


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.20 600 20.98 524 1572000 91.34

Solution (mls) 2000.0 1.130 2260 79.02 74.5 149000 8.66

Total 2860 100.00 1721000 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


OPTIMISATION CYANIDATION TIME LEACH TESTWORK - LIME IN LEACH - NO-CONDITIONING



(g) (g) (g) (g) (ppm) (%) (ppm) (ppm)

3000.0 2000.0 8.36

0 1.00 1.11 6.6 11.04 0.050 0.000 0.00 0.00 0.00

1 0.00 0.00 6.9 10.46 0.038 0.715 6.70 42.18 0.57

2 0.00 0.00 8.1 10.44 0.033 0.845 9.76 49.85 0.84

4 0.00 0.00 7.8 10.41 0.028 1.00 17.8 59.00 1.53

6 0.54 0.00 8.0 10.42 0.023 1.07 23.6 63.13 2.02

8 0.00 0.00 8.7 10.49 0.040 1.12 31.3 66.08 2.68

12 0.00 0.00 8.6 10.54 0.030 1.16 38.6 68.44 3.31

24 0.80 0.00 8.2 10.36 0.010 1.23 56.0 72.57 4.80

48 0.00 0.00 9.8 10.46 0.015 1.35 90.0 79.65 7.71


Gold


(ppm) (g) (%) (ppm) (g) (%)

Solids (g) 3000.0 0.23 690 20.35 718 2154000 92.29

Solution (mls) 2000.0 1.350 2700 79.65 90.0 180000 7.71

Total 3390 100.00 2334000 100.00


Assay Head 1.06 / 1.02 482

COMMENTS :









at each period.

Copper

0

10

20

30

40

50

60

70

80

90

100

0 4 8 12 16 20 24 28 32 36 40 44 48 52

EX

TR

AC

TIO

N (

%)

TIME (Hours)


GOLD

COPPER


APPENDIX XXI


CIL Cyanidation Leach Testwork Under Optimum Conditions

Details and Results

PROJECT A 13575 MT. TODD PROJECT


TEST No WH 4156

OVERALL MASTER COMP NEW MASTER COMPOSITE

GRIND P80 : 125 MICRONS


DATE

ADDITIONS

TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu

(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total

Yao (g) (%) (%)

3000.0 2000.0 2.4 8.2

0 63.1 1.00 1.27 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00

1 55.3 0.00 0.00 5.1 10.3 0.040 0.030 6.8 7.83 24 38 55.46 0.93

2 50.3 0.00 0.00 7.0 10.3 0.033 0.010 9.3 4.95 33 66 71.57 1.32

4 44.5 0.50 0.00 8.5 10.3 0.025 0.003 11.0 5.82 35 110 74.59 1.64

6 39.1 0.00 0.00 8.8 10.2 0.040 0.003 14.3 5.39 36 142 76.16 2.11

8 33.8 0.00 0.00 8.7 10.3 0.030 0.003 15.8 5.32 37 142 77.53 2.29

12 28.7 0.64 0.00 9.0 10.0 0.018 0.003 18.6 5.09 39 156 79.91 2.64

24 28.7 0.00 0.00 9.5 10.1 0.013 0.003 25.8 39 270 79.91 3.67


(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.71 (Kg/t)



2000.0 0.003 5 0.18 26 51600 3.01 4. Perth Tap Water Used : 1.000 (SG)


28.7 39.0 1119 39.41 270.0 7744 0.45 6. Grind Size P 80 : 125 (µm)

7. 63.08 grams of Haycarb Yao activated carbon was added

79.91 3.67 to the slurry at the start of cyanidation.

Total 2838 100.00 1712923 100.00 8. Evaporation losses made up prior to sampling at each period.

Calculated Grade 0.95 571 9. At start of the leach 100 g/t Pb(NO3)2 added.

Assay Grade 0.93 / 0.90 488


SAMPLE

Oct-11

CIL CYANIDATION TIME LEACH TESTWORK : LEAD NITRATE, AIR SPARGE



Final Carbon (g)

Total Extraction


Solids (g)

Solution (mls)

Intermed.Carbon *

0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



TEST No WH 4157

OVERALL MASTER COMP NEW MASTER COMPOSITE

GRIND P80 : 125 MICRONS


DATE

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 2.6 8.2

0 63.1 1.00 1.28 11.0 0.050 0.010 0.0 0.00 0 0 0.00 0.00

1 55.5 0.00 0.00 7.7 10.2 0.040 0.003 7.1 7.61 23 74 55.30 1.07

2 49.2 0.00 0.00 7.6 10.3 0.033 0.003 8.7 6.26 30 84 70.05 1.29

4 43.1 0.54 0.00 8.8 10.3 0.023 0.003 10.5 6.16 32 100 73.79 1.53

6 38.5 0.00 0.00 8.6 10.4 0.040 0.003 12.2 4.54 33 140 75.42 1.82

8 34.3 0.00 0.00 8.4 10.4 0.035 0.003 14.3 4.25 34 160 76.89 2.10

12 30.2 0.74 0.00 9.0 10.0 0.013 0.003 13.6 4.08 36 214 79.49 2.13

24 30.2 0.00 0.00 9.1 10.1 0.015 0.003 26.6 36 370 79.49 3.87







30.2 36.0 1086 41.27 370 11167 0.63 6. Grind Size P 80 : 125 (µm)





Assay Grade 0.93 / 0.90 488


COPPER COMMENTS :

Solids (g)

Solution (mls)

SAMPLE

Oct-11



Intermed.Carbon *

Final Carbon (g)

Total Extraction


GOLD

0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A 13575 MT. TODD PROJECTCLIENT VISTA GOLD CORPORATIONTEST No WH 4158

OVERALL MASTER COMP NEW MASTER COMPOSITEGRIND P80 : 125 MICRONSWATER PERTH TAP WATERDATE


(Hours) Ore Water NaCN Lime Oxygen pH NaCN Au Cu Total Total

(g) (g) (g) (g) (ppm) (%) (ppm) (ppm) Au Cu

9000.0 6000.0 4.0 8.2

0 3.00 3.92 11.0 0.050 0.00 0.0 0.00 0.00

1 0.00 0.00 7.6 10.4 0.038 0.94 7.4 66.79 0.89

2 0.00 0.00 7.8 10.3 0.035 1.06 9.9 75.31 1.20

4 0.00 0.00 8.2 10.3 0.033 1.10 12.7 78.15 1.53

6 0.00 0.00 8.2 10.3 0.033 1.15 15.2 81.71 1.83

8 1.62 0.00 8.7 10.3 0.023 1.18 18.2 83.84 2.19

12 1.50 0.00 8.5 10.3 0.025 1.19 21.5 84.55 2.59

24 0.00 0.00 9.4 10.5 0.033 1.19 27.5 84.55 3.31


Gold COMMENTS :


(ppm) (g) (%) (ppm) (g) (%) 1. NaCN addition : 0.68 (Kg/t)


Solids (g) 9000.0 0.15 1305 15.45 536 4824000 96.69 3. Lime consumption : 0.44 (Kg/t)

Solution (mls) 6000.0 1.19 7140 84.55 27.5 165000 3.31 4. Perth Tap Water used : 1.000 (SG)

5. Grind Size P 80 : 125 (µm)

6. Leach test conducted in mechanically

Total Extraction 84.55 3.31 stirred, baffled agitation vat leach.

Total 8445 100.00 4989000 100.00 8. Evaporation losses made up prior to sampling

Calculated Head 0.94 554 at each period

Assay Head 0.93 / 0.90 488 9. At start of the leach 100 g/t Pb(NO3)2 added.

BULK CYANIDATION TIME LEACH TESTWORK : AIR SPARGE

Copper

SAMPLE

Oct-11

0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26

EX

TR

AC

TIO

N (

%)

TIME (Hours)


Total Au

Total Cu


OVERALL MASTER COMP NEW MASTER COMPOSITEGRIND P80 : 125 MICRONSWATER PERTH TAP WATER HIGH REAGENT MAINTENANCE TESTDATE

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 2.4 8.0

0 63.1 1.00 1.36 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00

1 55.2 0.30 0.30 8.5 10.3 0.035 0.010 8.8 7.85 27 86 65.19 1.43

2 48.2 0.10 0.19 8.8 10.6 0.045 0.003 11.7 7.02 30 114 70.89 1.90

4 41.2 0.10 0.18 9.2 10.6 0.045 0.003 14.9 6.97 32 134 74.54 2.36

6 35.8 0.20 0.20 9.2 10.5 0.040 0.003 17.9 5.43 33 150 76.10 2.77

8 29.9 0.10 0.16 8.3 10.6 0.045 0.003 20.7 5.88 33 164 76.10 3.15

12 21.3 0.14 0.15 8.5 10.7 0.043 0.003 23.5 8.66 33 184 76.10 3.54

24 21.3 0.00 0.00 9.0 10.3 0.023 0.003 30.0 35 226 77.30 4.41

1.94 2.54







21.3 34.5 734 27.76 226.0 4807 0.30 6. Grind Size P 80 : 125 (µm)





Assay Grade 0.93 / 0.90 488


Final Carbon (g)

Total Extraction


Solids (g)

Solution (mls)

Intermed.Carbon *


SAMPLE

Dec-11



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total


OVERALL MASTER COMP NEW MASTER COMPOSITEGRIND P80 : 125 MICRONSWATER PERTH TAP WATER HIGH REAGENT MAINTENANCE TESTDATE

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 2.4 8.0

0 63.1 1.00 1.37 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00

1 54.3 0.30 0.30 7.1 10.4 0.035 0.010 9.4 8.74 27 134 63.23 1.67

2 46.4 0.04 0.15 8.5 8.7 0.048 0.003 12.3 7.98 33 148 74.64 2.07

4 40.4 0.14 0.14 9.2 10.7 0.043 0.003 15.0 5.99 34 160 76.34 2.44

6 34.3 0.14 0.15 9.3 10.7 0.043 0.003 17.7 6.09 35 194 77.83 2.85

8 28.7 0.14 0.14 8.5 10.7 0.043 0.003 20.4 5.54 36 216 79.08 3.23

12 18.7 0.14 0.15 8.6 10.7 0.043 0.003 24.1 10.00 36 238 79.08 3.72

24 18.7 0.00 0.00 9.2 10.2 0.020 0.003 30.1 36 248 79.08 4.47

1.90 2.40







18.7 36.0 675 24.76 248.0 4648 0.28 6. Grind Size P 80 : 125 (µm)





Assay Grade 0.93 / 0.90 488


Final Carbon (g)

Total Extraction


Solids (g)

Solution (mls)

Intermed.Carbon *


SAMPLE

Dec-11



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575


TEST No WH4455 TEST 1

MASTER COMPOSITE SAMPLE

GRIND P80 : 150 µm


DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 5.9 8.1

0 63.1 1.00 1.27 11.0 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 57.6 0.00 0.00 7.0 10.3 0.033 0.020 8.20 5.50 27 140 65.76 1.55

2 52.8 0.00 0.00 7.3 10.3 0.033 0.003 9.30 4.80 28 118 66.61 1.61

4 46.4 0.60 0.00 8.0 10.2 0.020 0.003 11.50 6.40 30 168 70.59 2.04

6 40.8 0.00 0.00 8.2 10.2 0.040 0.003 13.30 5.60 32 136 74.09 2.17

8 35.1 0.00 0.00 9.0 10.2 0.033 0.003 14.00 5.70 33 158 75.63 2.31

12 30.7 0.80 0.00 8.0 10.2 0.010 0.003 17.80 4.40 33 150 75.63 2.76

24 26.8 0.00 0.00 8.4 10.3 0.030 0.003 28.70 3.90 33 144 75.63 4.09

36 23.1 0.70 0.00 8.2 10.1 0.015 0.003 35.60 3.70 33 230 75.63 5.08

48 23.1 0.00 0.00 9.5 10.5 0.020 0.003 43.50 35 200 77.37 6.01






40.0 1238 46.69 6146 0.38 5. Water weight to leach: 2000.0 (g)

23.1 35.0 809 30.49 200 4620 0.28 6. Grind Size P 80 : 150 (µm)

7. 63.1 g carbon was added to the slurry at the

77.37 6.01 start of cyanidation.


Calculated Grade 0.88 543 9. 100 g/t of PbNO3 added at the start of leach.

Assay Grade 0.90/0.93 488


Solution (mls)

Solids (g)


SAMPLE

GRIND OPTIMATIZATION, DUPLICATE CIL CYANIDATION LEACH TESTWORK : AIR SPARGED, LEAD NITRATE


Intermed.Carbon * (g)

Final Carbon (g)

Total Extraction


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575


TEST No WH4456 TEST 1 - DUPLICATE

MASTER COMPOSITE SAMPLEGRIND P80 : 150 µm


DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 6.1 8.0

0 63.1 1.00 1.33 11.1 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 57.2 0.00 0.00 7.2 10.3 0.030 0.020 8.34 5.90 27 70 65.65 1.25

2 50.9 0.00 0.00 7.5 10.3 0.030 0.003 9.30 6.30 28 66 66.49 1.35

4 44.7 0.60 0.00 9.8 10.2 0.020 0.003 11.40 6.20 30 98 70.32 1.69

6 40.1 0.00 0.00 9.4 10.4 0.040 0.003 13.50 4.60 32 130 73.69 2.02

8 32.6 0.00 0.00 8.7 10.3 0.028 0.003 14.00 7.50 33 116 75.20 2.05

12 29.2 0.00 0.00 8.1 10.3 0.028 0.003 17.50 3.40 33 116 75.20 2.46

24 24.4 0.90 0.94 8.5 9.6 0.005 0.003 17.10 4.80 33 384 75.20 2.88

36 19.6 0.00 0.00 8.1 11.0 0.048 0.003 37.90 4.80 33 198 75.20 5.07

48 19.6 0.00 0.00 9.5 10.6 0.018 0.003 45.50 36 236 77.41 6.01







19.6 36.0 706 26.57 236 4626 0.27 6. Grind Size P 80 : 150 (µm)








SAMPLE



Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575




GRIND P80 : 125 µm


DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 4.9 8.0

0 63.1 1.00 1.27 11.0 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 56.9 0.00 0.00 6.8 10.2 0.035 0.025 8.20 6.20 27 116 68.22 1.41

2 52.0 0.00 0.00 7.0 10.2 0.035 0.005 9.22 4.90 30 70 73.30 1.37

4 47.4 0.60 0.00 9.0 10.2 0.020 0.003 12.00 4.60 32 80 77.15 1.74

6 42.0 0.00 0.00 12.7 10.3 0.033 0.003 14.20 5.40 33 102 78.99 2.06

8 33.8 0.50 0.00 8.7 10.2 0.025 0.003 15.60 8.20 33 104 78.99 2.23

12 29.3 0.00 0.00 8.1 10.7 0.043 0.003 22.10 4.50 33 80 78.99 2.95

24 24.4 0.00 0.00 8.5 10.5 0.028 0.003 37.60 4.90 33 92 78.99 4.82

36 18.7 0.60 0.00 8.1 10.4 0.020 0.003 50.90 5.70 33 224 78.99 6.59

48 18.7 0.00 0.00 9.5 10.6 0.025 0.003 71.80 33 258 78.99 9.11







18.7 33.0 617 24.00 258 4825 0.29 6. Grind Size P 80 : 125 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575





DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 6.6 8.0

0 63.1 1.00 1.25 11.0 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 59.6 0.00 0.00 6.4 10.2 0.033 0.015 7.90 3.50 24 64 61.03 1.20

2 54.0 0.00 0.00 6.9 10.2 0.030 0.003 9.78 5.60 28 70 69.47 1.45

4 46.5 0.64 0.00 9.5 10.2 0.018 0.003 11.90 7.50 30 114 73.74 1.85

6 41.1 0.00 0.00 12.3 10.9 0.040 0.003 14.20 5.40 31 128 75.57 2.17

8 37.0 0.00 0.00 8.6 10.4 0.033 0.003 15.40 4.10 32 124 77.20 2.31

12 32.8 0.50 0.00 8.2 10.4 0.025 0.003 20.30 4.20 33 160 78.66 2.98

24 27.9 0.64 0.00 8.5 10.6 0.018 0.003 32.60 4.90 33 248 78.66 4.65

36 23.1 0.00 0.00 8.4 10.2 0.028 0.003 52.60 4.80 33 322 78.66 7.19

48 23.1 0.00 0.00 9.4 10.5 0.010 0.003 52.60 33 400 78.66 7.30







23.1 33.0 762 30.13 400 9240 0.56 6. Grind Size P 80 : 125 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575




GRIND P80 : 106 µm


DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 5.4 8.1

0 63.1 1.00 1.36 11.1 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 59.6 0.00 0.00 7.3 10.3 0.038 0.020 9.04 3.50 27 196 68.96 1.73

2 54.0 0.00 0.00 6.6 10.2 0.030 0.003 10.90 5.60 30 70 74.64 1.52

4 46.5 0.60 0.00 9.4 10.3 0.020 0.003 13.90 7.50 31 88 76.78 1.91

6 41.1 0.00 0.00 9.4 10.3 0.043 0.003 16.40 5.40 32 106 78.62 2.24

8 37.0 0.00 0.00 8.6 10.3 0.033 0.003 16.80 4.10 33 136 80.24 2.36

12 32.8 0.54 0.00 8.2 10.4 0.023 0.003 22.90 4.20 33 158 80.24 3.10

24 27.9 0.74 0.00 8.6 10.3 0.013 0.003 33.30 4.90 33 242 80.24 4.44

36 23.1 0.00 0.00 8.6 10.3 0.028 0.003 54.50 4.80 33 242 80.24 6.85

48 23.1 0.00 0.00 9.5 10.5 0.015 0.010 63.50 35 268 82.20 7.91







23.1 34.5 797 31.52 268 6191 0.35 6. Grind Size P 80 : 106 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575





DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.3 5.4 8.1

0 63.3 1.00 1.00 11.1 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 59.2 0.00 0.00 5.2 10.3 0.035 0.020 9.78 4.10 27 78 67.22 1.48

2 55.6 0.00 0.00 6.7 10.3 0.033 0.015 12.00 3.60 30 82 73.66 1.77

4 51.2 0.64 0.00 9.0 10.3 0.018 0.003 15.60 4.40 32 112 76.97 2.31

6 43.5 0.00 0.00 9.6 10.4 0.040 0.003 18.20 7.70 33 142 78.94 2.71

8 38.2 0.00 0.00 7.5 10.4 0.030 0.003 18.50 5.30 33 160 78.94 2.80

12 34.1 0.53 0.00 8.2 10.5 0.023 0.003 24.90 4.10 33 208 78.94 3.68

24 27.1 0.64 0.00 8.4 10.5 0.018 0.003 38.10 7.00 33 250 78.94 5.37

36 22.7 0.00 0.00 8.6 10.7 0.033 0.003 55.30 4.40 33 212 78.94 7.39

48 22.7 0.00 0.00 9.5 10.3 0.005 0.003 49.90 36 594 81.56 7.27







22.7 36.0 818 31.41 594 13490 0.82 6. Grind Size P 80 : 106 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575




GRIND P80 : 90 µm


DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 6.1 8.0

0 63.1 1.00 1.36 11.0 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 59.2 0.00 0.00 6.3 10.3 0.035 0.055 9.78 3.90 27 118 72.25 1.62

2 55.3 0.00 0.00 5.6 10.2 0.030 0.005 12.70 3.90 30 126 75.34 2.00

4 47.4 0.60 0.00 9.0 10.3 0.020 0.010 17.90 7.90 31 190 77.94 2.84

6 40.5 0.00 0.00 9.2 10.3 0.043 0.003 20.70 6.90 32 206 79.23 3.23

8 36.0 0.00 0.00 7.4 10.4 0.035 0.003 23.20 4.50 33 196 80.84 3.50

12 31.5 0.00 0.00 8.2 10.4 0.028 0.003 30.20 4.50 33 216 80.84 4.39

24 26.8 0.84 0.00 8.5 10.2 0.008 0.003 36.70 4.70 33 396 80.84 5.51

36 20.6 0.00 0.00 8.1 10.6 0.028 0.003 62.70 6.20 33 294 80.84 8.47

48 20.6 0.00 0.00 9.6 10.4 0.010 0.003 56.20 35 516 82.07 7.97







20.6 34.5 711 28.31 516 10630 0.64 6. Grind Size P 80 : 90 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575





DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 1.6 8.0

0 63.1 1.00 1.51 11.1 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 59.4 0.00 0.00 6.5 10.4 0.033 0.025 9.32 3.70 30 110 69.64 1.48

2 53.2 0.00 0.00 7.7 10.3 0.028 0.005 12.50 6.20 34 140 76.72 1.95

4 45.3 0.60 0.00 8.2 10.2 0.020 0.003 16.00 7.90 36 178 80.36 2.48

6 38.8 0.00 0.00 8.4 10.4 0.043 0.003 20.10 6.50 36 190 80.36 2.98

8 32.5 0.00 0.00 8.8 10.3 0.033 0.003 23.70 6.26 37 242 81.75 3.52

12 26.7 0.70 0.00 8.2 10.3 0.015 0.003 28.20 5.80 38 286 82.91 4.12

24 22.1 0.64 0.00 9.1 10.3 0.018 0.003 47.50 4.60 39 330 83.87 6.43

36 18.0 0.00 0.00 8.6 10.4 0.028 0.003 65.10 4.10 39 314 83.87 8.45

48 18.0 0.00 0.00 8.8 9.9 0.008 0.003 84.30 39 948 83.87 11.34







18.0 39.0 704 25.22 948 17102 0.99 6. Grind Size P 80 : 90 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575




GRIND P80 : 75 µm


DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 1.5 8.0

0 63.1 1.00 1.48 11.0 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 58.1 0.00 0.00 6.2 10.3 0.033 0.015 9.70 5.00 30 96 73.82 1.51

2 51.0 0.54 0.00 8.2 10.3 0.023 0.003 13.40 7.15 33 138 79.56 2.09

4 43.5 0.00 0.00 7.6 10.3 0.038 0.003 18.80 7.50 33 154 79.56 2.78

6 37.4 0.00 0.00 8.4 10.3 0.030 0.003 23.30 6.07 33 196 79.56 3.42

8 30.8 0.50 0.00 8.4 10.3 0.025 0.003 26.50 6.54 33 252 79.56 3.92

12 25.9 0.00 0.00 8.2 10.5 0.030 0.003 34.20 4.98 34 242 80.74 4.81

24 22.0 0.84 0.00 9.2 10.1 0.008 0.003 46.00 3.90 36 552 82.72 6.68

36 18.1 0.00 0.00 8.6 10.5 0.028 0.003 75.20 3.90 36 366 82.72 9.90

48 18.1 0.00 0.00 8.6 10.0 0.008 0.003 111.00 36 974 82.72 14.78







18.1 36.0 650 24.96 974 17590 1.04 6. Grind Size P 80 : 75 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

PROJECT A13575





DATE Dec-11

ADDITIONS



Yao (g) (%) (%)

3000.0 2000.0 63.1 3.7 8.0

0 63.1 1.00 1.56 11.0 0.050 0.000 0.00 0.00 0 0 0.00 0.00

1 59.1 0.00 0.00 6.4 10.4 0.033 0.035 11.70 4.02 30 86 71.70 1.69

2 56.6 0.00 0.00 6.5 10.4 0.030 0.010 14.80 2.51 33 102 76.35 2.10

4 48.5 0.64 0.00 8.5 10.4 0.018 0.005 21.30 8.07 35 146 80.11 3.01

6 41.4 0.00 0.00 8.9 10.5 0.040 0.003 24.50 7.13 36 162 81.70 3.43

8 37.2 0.00 0.00 7.5 10.5 0.035 0.003 26.80 4.18 36 184 81.70 3.75

12 32.5 0.53 0.00 8.2 10.5 0.023 0.003 35.10 4.72 36 216 81.70 4.79

24 26.5 0.90 0.00 8.6 10.3 0.005 0.003 60.60 5.98 37 360 82.89 8.05

36 22.0 0.00 0.00 8.7 10.9 0.038 0.003 77.30 4.45 38 284 83.85 9.89

48 22.0 0.00 0.00 9.5 10.6 0.015 0.003 80.90 39 408 84.66 10.47







22.0 39.0 860 31.40 408 8992 0.53 6. Grind Size P 80 : 75 (µm)







Solids (g)

Solution (mls)


Final Carbon (g)

Total Extraction



SAMPLE



0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total


APPENDIX XXII


Sequential Triple Contact CIP

Details and Results

TEST No. : A13575 WH4158 : OVERALL MASTER COMP

CARBON TYPE : HAYCARB YAO 6x12

CARBON WEIGHT (g) : 2.30

SLURRY % SOLIDS (%) : 60.0

SOLUTION WEIGHT (g) : 1738.0 (PER CONTACT) Eqv Vol (ml) : 1738.0

SLURRY SAMPLE VOLUME (mls) : 80.0 Eqv Vol (ml) : 51.4

ORE SG : 2.70

SOLUTION SG : 1.000

SEQUENTIAL BATCH CIP TEST : WH3923 - GOLD RESULTS

TEST RESULTS

CYCLE SOLUTION ELAPSED TIME SOLUTION CARBON CARBON FINAL

VOLUME Cycle Cumulative GOLD CALC'd CALC'd CARBON

LOADING LOADING ASSAY

Incremental Cumulative

Au Au Au Au

(mls) (Hours) (Hours) (ppm) (ppm) (ppm) (ppm)

1 1738 0.00 0.00 1.19 0 0

1687 0.50 0.50 0.95 181 181

1635 1.00 1.00 0.74 154 335

1584 2.00 2.00 0.62 85 421

2 1738 0.00 2.00 1.19 0 421

1687 0.50 2.50 0.97 166 587

1635 1.00 3.00 0.77 147 734

1584 2.00 4.00 0.69 57 790

3 1738 0.00 4.00 1.19 0 790

1687 0.50 4.50 0.99 151 942

1635 1.00 5.00 0.95 29 971

1584 2.00 6.00 0.86 64 1035

1532 3.00 7.00 0.78 55 1090

1481 4.00 8.00 0.74 27 1117

1429 20.00 24.00 0.09 419 1535

FLEMING KINETIC CONSTANTS, REGRESSION OVER FIRST 6 HOURS

Fleming k (hr-1

) : 164.54 Fleming n : 0.710

100

1000

10000

0.00 4.00 8.00 12.00 16.00 20.00 24.00

CO

PP

ER

LO

AD

ING

ON

CA

RB

ON

(g

/t)

TIME (Hours)

GOLD LOADING ON CARBON

TEST No. : A13575 WH4158 : OVERALL MASTER COMP

CARBON TYPE : HAYCARB YAO 6x12

CARBON WEIGHT (g) : 2.30

SLURRY % SOLIDS (%) : 60.0

SOLUTION WEIGHT (g) : 1738.0 (PER CONTACT) Eqv Vol (ml) : 1738.0

SLURRY SAMPLE VOLUME (mls) : 80.0 Eqv Vol (ml) : 51.4

ORE SG : 2.70

SOLUTION SG : 1.000

SEQUENTIAL BATCH CIP TEST : WH3923 - COPPER RESULTS

TEST RESULTS

CYCLE SOLUTION ELAPSED TIME SOLUTION CARBON CARBON FINAL

VOLUME Cycle Cumulative COPPER CALC'd CALC'd CARBON

LOADING LOADING ASSAY

Incremental Cumulative

Cu Cu Cu Cu

(mls) (Hours) (Hours) (ppm) (ppm) (ppm) (ppm)

1 1738 0.00 0.00 27.5 0 0

1687 0.50 0.50 27.4 76 76

1635 1.00 1.00 27.3 73 149

1584 2.00 2.00 27.2 71 220

2 1738 0.00 2.00 27.5 0 220

1687 0.50 2.50 27.4 76 296

1635 1.00 3.00 27.3 73 369

1584 2.00 4.00 27.2 71 440

3 1738 0.00 4.00 27.5 0 440

1687 0.50 4.50 27.4 76 516

1635 1.00 5.00 27.3 73 589

1584 2.00 6.00 27.2 71 660

1532 3.00 7.00 27.1 69 729

1481 4.00 8.00 26.8 200 929

1429 20.00 24.00 26.3 322 1251 1152

FLEMING KINETIC CONSTANTS, REGRESSION OVER FIRST 6 HOURS

Fleming k (hr-1

) : 2.51 Fleming n : 0.868

100

1000

10000

0 4 8 12 16 20 24CO

PP

ER

LO

AD

ING

ON

CA

RB

ON

(g

/t)

TIME (Hours)

COPPER LOADING ON CARBON



TEST No COMPREHENSIVE ANALYSIS ON LOADED CARBON

OVERALL MASTER COMP

GRIND P80 : 125


DATE Oct-11

LOADED CARBON

ANALYTE UNIT WH 4158

Au1 ppm -

Ag ppm 320

Al ppm 2700

Ba ppm 60

Bi ppm <10

Ca ppm 1900

Cd ppm <5

Co ppm <5

Cr ppm 30

Cu ppm 1152

Fe % 2970

K ppm 1300

Li ppm <5

Mg ppm 880

Mn ppm 25

Mo ppm 5

Na ppm 1600

Ni ppm 440

P ppm <100

Pb ppm 80

Sr ppm 18

Ti ppm 150

V ppm 10

Y ppm <5

Zn ppm 108

Zr ppm 5

SAMPLE


APPENDIX XXIII


Cyanide Detoxification and Detoxification Product Geochemical Analysis

Details and Results



ADDITIONS



Yao (g) (%) (%) (%) (%)

15000.0 10000.0 4.3 8.0

0 315.4 5.00 6.77 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00 0.00 0.00

1 312.4 0.00 0.00 3.1 10.3 0.038 0.030 7.1 3.00 24 34 58.43 58.43 0.95 1.09

2 310.1 0.00 0.00 3.6 10.2 0.030 0.010 9.5 2.27 29 54 68.00 68.00 1.28 1.51

4 306.9 2.50 0.00 4.8 10.2 0.025 0.005 12.6 3.20 31 94 72.24 72.24 2.09 2.09

6 305.0 0.00 0.00 5.5 10.3 0.043 0.003 15.5 1.94 32 118 74.33 74.33 2.58 2.58

8 302.5 0.00 0.00 6.1 10.3 0.035 0.003 17.6 2.51 33 128 76.59 76.59 2.90 2.90

12 284.5 0.00 0.00 6.8 10.4 0.028 0.003 20.7 17.99 34 160 78.84 78.84 3.45 3.45

24 284.5 0.00 0.00 7.5 10.4 0.013 0.003 24.2 284.47 34 246 78.84 78.84 4.24 4.24







284.5 34.0 9672 71.81 246 69980 0.94 6. Grind Size P 80 : 125 (µm)





Assay Grade 0.93 / 0.90 488


Final Carbon (g)

Total Extraction


Solids (g)

Solution (mls)

Intermed.Carbon *


SAMPLE

Oct-11

CIL CYANIDATION TIME LEACH TESTWORK : LEAD NITRATE, AIR SPARGE FOR DETOX


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total



ADDITIONS



Yao (g) (%) (%) (%) (%)

15000.0 10000.0 2.6 8.1

0 315.4 5.00 7.01 11.2 0.050 0.000 0.0 0.00 0 0 0.00 0.00 0.00 0.00

1 312.2 0.00 0.00 3.1 10.3 0.035 0.040 7.6 3.17 24 66 60.52 60.52 0.96 1.22

2 309.2 0.00 0.00 3.8 10.2 0.030 0.015 9.8 3.01 30 74 72.27 72.27 1.23 1.52

4 307.5 2.50 0.00 4.9 10.3 0.025 0.003 13.6 1.71 32 108 76.02 76.02 2.13 2.13

6 305.1 0.00 0.00 5.7 10.4 0.045 0.003 17.0 2.35 33 134 78.36 78.36 2.65 2.65

8 303.4 0.00 0.00 6.1 10.4 0.040 0.003 19.7 1.79 33 156 78.36 78.36 3.08 3.08

12 283.0 0.00 0.00 7.1 10.5 0.033 0.003 23.8 20.39 33 196 78.36 78.36 3.74 3.74

24 283.0 0.00 0.00 7.3 10.5 0.013 0.003 30.8 282.96 33 288 78.36 78.36 5.97 5.97







283.0 33.0 9338 70.92 288 81492 1.02 6. Grind Size P 80 : 125 (µm)





Assay Grade 0.93 / 0.90 488


Intermed.Carbon *

Final Carbon (g)

Total Extraction



Solids (g)

Solution (mls)

SAMPLE

Oct-11

CIL CYANIDATION TIME LEACH TESTWORK : LEAD NITRATE, AIR SPARGE FOR DETOX


0

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 14 16 18 20 22 24

EX

TR

AC

TIO

N

(%)

TIME (Hours)


Au-Total

Cu-Total

TABLE SO2/Air Cyanide Detoxification Test D1Sample: WH4270

Operating Conditions Client: Vista Gold Corporation Date: 21 Oct 2011Project: Mt Todd Project Test: A13575 D1

Time pH KG Temp D.O Meta Cu Feed Lime CN load SO2 Ratio CuSO4.5H2O Ca(OH)2 Ret Time SolutionRatio

min mVoC ppm mL/hr mL/hr mL/hr mL/hr g/hr gSO2/gCN ppm gCa(OH)2/gSO2 min L/hr

0 8.50 -79 22 4.7 10.0 10.0 440 5.0 0.05 2.76 26 0.72 61.94 0.2815 8.56 -175 4.5 10.0 10.0 440 5.0 0.05 2.76 26 0.72 61.94 0.2830 8.58 -225 4.6 10.0 10.0 440 5.0 0.05 2.76 26 0.72 61.94 0.2845 8.48 -263 4.8 10.0 10.0 440 5.0 0.05 2.76 26 0.72 61.94 0.2860 8.72 -318 4.8 10.0 10.0 440 5.0 0.05 2.76 26 0.72 61.94 0.2875 8.77 -335 4.9 10.0 10.0 460 5.0 0.05 2.64 25 0.72 59.38 0.2990 8.85 -345 4.9 10.0 10.0 460 5.0 0.05 2.64 25 0.72 59.38 0.29105 8.91 -358 4.9 10.0 10.0 460 5.0 0.05 2.64 25 0.72 59.38 0.29120 8.94 -363 4.9 10.0 10.0 460 5.0 0.05 2.64 25 0.72 59.38 0.29135 8.99 -373 4.9 10.0 10.0 470 0.0 0.05 2.58 25 0.00 58.78 0.29150 8.68 -377 4.9 10.0 10.0 470 0.0 0.05 2.58 25 0.00 58.78 0.29165 8.70 -374 4.9 10.0 10.0 470 0.0 0.05 2.58 25 0.00 58.78 0.29180 8.69 -377 4.9 10.0 10.0 470 0.0 0.05 2.58 25 0.00 58.78 0.29AVG 8.72 -305 22.0 4.8 10.00 10.00 455 3.46 0.05 2.67 26 0.50 60.14 0.29

Reactor Size 480 COMMENTS: 3.23 3.23 1.12 92.41CuSO4.5H2O Conc (gpl) 0.73 Feed, Meta, Copper and Lime flowrates determined from hourly average.Meta Conc (gpl) 20.52 20.52g/L Na2S2O5Ca(OH)2 (gpl) 20.00 20g/L LimeAgitator (rpm) 1100Air Flow (L/min/L) MaxSolids (S.G.) 2.61 Estimated solids s.gSolids (% wt) 60.74Soln (S.G.) 0.999 CNp determined by Picric Acid method (CNp is equivalent to CN(wad))Slurry (S.G.) 1.598

Sample Time CNFREE CNp Cu Fe Ni Zn Calculated COMMENTSmin ppm ppm ppm ppm ppm ppm CN total

FEED 0 132.7 181.6 34.10 11.40 0.65 5.30 213.4DISP 1A 0-30 30 N/a 13.85 22.70 1.10 0.55 0.02 16.92DISP 1B 30-60 60 N/a 41.68 31.30 1.20 0.65 0.02 45.03DISP 2A 60-90 90 N/a 49.52 28.00 0.60 0.70 0.04 51.20DISP 2B 90-120 120 N/a 54.20 26.60 0.70 0.75 0.02 56.16DISP 3A 120-150 150 N/a 41.68 24.20 0.40 0.75 0.02 42.80DISP 3B 150-180 180 N/a 36.24 22.10 0.50 0.80 0.02 37.64

AVERAGE SOLN ASSAYS 39.53 25.82 0.75 0.70 0.02 41.62AVERAGE SOLN ASSAYS (LAST 2 SAMPLES) 38.96 23.15 0.45 0.78 0.02 40.22

0

10

20

30

40

50

60

30 60 90 120 150 180

CN(w

ad) (mg/L)

Time (min)

CN(wad) vs Time

0

5

10

15

20

25

30

35

0 10 20 30 40 50 60

[M] (m

g/L)

CN(wad) (mg/L)

[M] vs CN(wad)

Cu

Ni

Zn

Linear (Cu)

Linear (Ni)

Linear (Zn)





0 8.61 -121 22 3.9 10.0 10.0 460 10.0 0.05 3.17 25 1.21 58.78 0.2915 8.50 -189 4.5 10.0 10.0 460 10.0 0.05 3.17 25 1.21 58.78 0.2930 8.54 -266 4.8 10.0 10.0 460 10.0 0.05 3.17 25 1.21 58.78 0.2945 8.48 -231 5.0 10.0 10.0 460 10.0 0.05 3.17 25 1.21 58.78 0.2960 8.47 -332 5.0 10.0 10.0 460 10.0 0.05 3.17 25 1.21 58.78 0.2975 8.50 -342 5.0 10.0 10.0 410 5.0 0.05 3.55 28 0.60 66.21 0.2690 8.50 -341 5.0 10.0 10.0 410 5.0 0.05 3.55 28 0.60 66.21 0.26105 8.49 -343 5.0 10.0 10.0 410 5.0 0.05 3.55 28 0.60 66.21 0.26120 8.48 -344 5.0 10.0 10.0 410 5.0 0.05 3.55 28 0.60 66.21 0.26135 8.50 -342 5.0 10.0 10.0 430 5.0 0.05 3.39 27 0.60 63.30 0.27150 8.48 -344 5.0 10.0 10.0 430 5.0 0.05 3.39 27 0.60 63.30 0.27165 8.50 -341 5.0 10.0 10.0 430 5.0 0.05 3.39 27 0.60 63.30 0.27180 8.52 -345 5.0 10.0 10.0 430 5.0 0.05 3.39 27 0.60 63.30 0.27AVG 8.51 -299 22.0 4.9 10.00 10.00 435 6.92 0.05 3.35 27 0.83 62.30 0.27





0

10

20

30

40

50

60

30 60 90 120 150 180

CN(w

ad) (mg/L)

Time (min)

CN(wad) vs Time

‐5

0

5

10

15

20

25

30

35

0 10 20 30 40 50 60

[M] (m

g/L)

CN(wad) (mg/L)

[M] vs CN(wad)

Cu

Ni

Zn

Linear (Cu)

Linear (Ni)

Linear (Zn)





0 8.58 -158 22 4.2 10.0 10.5 450 25.0 0.05 3.78 27 2.58 58.12 0.2815 8.50 -167 3.8 10.0 10.5 450 25.0 0.05 3.78 27 2.58 58.12 0.2830 8.47 -170 4.4 10.0 10.5 450 25.0 0.05 3.78 27 2.58 58.12 0.2845 8.47 -183 4.6 10.0 10.5 450 25.0 0.05 3.78 27 2.58 58.12 0.2860 8.46 -228 4.8 10.0 10.5 450 25.0 0.05 3.78 27 2.58 58.12 0.2875 8.47 -266 4.9 10.0 10.0 490 25.0 0.06 3.47 24 2.58 53.83 0.3190 8.47 -309 5.0 10.0 10.0 490 25.0 0.06 3.47 24 2.58 53.83 0.31105 8.47 -334 5.1 10.0 10.0 490 25.0 0.06 3.47 24 2.58 53.83 0.31120 8.48 -336 5.1 10.0 10.0 490 25.0 0.06 3.47 24 2.58 53.83 0.31135 8.49 -338 5.1 10.0 10.0 530 18.0 0.06 3.21 22 1.86 50.70 0.33150 8.48 -335 5.1 10.0 10.0 530 18.0 0.06 3.21 22 1.86 50.70 0.33165 8.48 -332 5.1 10.0 10.0 530 18.0 0.06 3.21 22 1.86 50.70 0.33180 8.52 -327 5.1 10.0 10.0 530 18.0 0.06 3.21 22 1.86 50.70 0.33AVG 8.49 -268 22.0 4.8 10.00 10.19 487 22.85 0.06 3.49 24 2.36 54.34 0.31





0

5

10

15

20

25

30

35

30 60 90 120 150 180

CN(w

ad) (mg/L)

Time (min)

CN(wad) vs Time

‐5

0

5

10

15

20

0 5 10 15 20 25 30 35

[M] (m

g/L)

CN(wad) (mg/L)

[M] vs CN(wad)

Cu

Ni

Zn

Linear (Cu)

Linear (Ni)

Linear (Zn)





0 8.52 -133 22 4.5 10.0 10.0 470 15.0 0.05 5.17 25 1.08 57.03 0.2915 8.58 -132 4.4 10.0 10.0 470 15.0 0.05 5.17 25 1.08 57.03 0.2930 8.50 -130 4.3 10.0 10.0 470 15.0 0.05 5.17 25 1.08 57.03 0.2945 8.48 -127 4.5 10.0 10.0 470 15.0 0.05 5.17 25 1.08 57.03 0.2960 8.51 -126 4.4 10.0 10.0 470 15.0 0.05 5.17 25 1.08 57.03 0.2975 8.48 -123 4.5 10.0 10.0 480 30.0 0.05 5.06 24 2.17 54.34 0.3090 8.53 -121 4.4 10.0 10.0 480 30.0 0.05 5.06 24 2.17 54.34 0.30105 8.51 -119 4.4 10.0 10.0 480 30.0 0.05 5.06 24 2.17 54.34 0.30120 8.50 -117 4.4 10.0 10.0 480 30.0 0.05 5.06 24 2.17 54.34 0.30135 8.77 -114 4.4 10.0 10.0 500 25.0 0.06 4.86 23 1.81 52.84 0.31150 8.50 -113 4.4 10.0 10.0 500 25.0 0.06 4.86 23 1.81 52.84 0.31165 8.51 -110 4.4 10.0 10.0 500 25.0 0.06 4.86 23 1.81 52.84 0.31180 8.49 -108 4.4 10.0 10.0 500 25.0 0.06 4.86 23 1.81 52.84 0.31AVG 8.53 -121 22.0 4.4 10.00 10.00 482 22.69 0.05 5.03 24 1.64 54.86 0.30





0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

30 60 90 120 150 180

CN(w

ad) (mg/L)

Time (min)

CN(wad) vs Time

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

[M] (m

g/L)

CN(wad) (mg/L)

[M] vs CN(wad)

Cu

Ni

Zn

Linear (Cu)

Linear (Ni)

Linear (Zn)

Documents

SAMPLE IDENTITY VARIABILITY COMPOSITE #56 CLIENT VISTA ... AMMTEC FS... · bond ball mill closed circuit grindability : 212 micrometers variability composite #56 client vista gold