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Certificate of Analysis, ROCKLABS Reference Material OxJ47, 13 March 2006. Page 1 of 6.

Certificate of Analysis

Reference Material OxJ47

Recommended Gold Concentration: 2.384 µg/g

95% Confidence Interval: +/- 0.020 µg/g

The above values apply only to product in jars or sachets which have an identification number

within the following range: 109 952 – 111 272.

Prepared and Certified By: Malcolm Smith BSc, FNZIC

Malcolm Smith Reference Materials Ltd

40 Oakford Park Crescent, Greenhithe,

Auckland 1311

NEW ZEALAND

Email: [email protected]

Telephone: +64 9 444 3534

Fax: +64 9 444 7739

Date of Certification: 13 March 2006

Certificate Status: Original

Available Packaging: This reference material has been packed in wide-

mouthed jars that contain 2.5 kg of product. The

contents of some jars may be subsequently

repacked into sealed polyethylene sachets.

Origin of Reference Material: Feldspars with minor quantities of finely divided

gold-containing minerals that have been screened

to ensure there is no gold nugget effect.

Supplier of Reference Material: ROCKLABS Ltd

P O Box 18 142

Auckland

NEW ZEALAND


Website: www.rocklabs.com

Telephone: +64 9 634 7696


Description: The component minerals have been well mixed and a

homogeneity test carried out after the entire batch was

packaged into wide-mouthed jars to ascertain that the gold is

evenly distributed throughout the reference material. There is

no soil component. The product contains crystalline quartz

and therefore dust from it should not be inhaled.

The approximate chemical composition is:

(Uncertified Values)

%

SiO2 66.63

Al2O3 19.13

Na2O 8.38

K2O 3.84

CaO 0.22

MgO 0.18

TiO2 0.03

MnO 0.00

P2O5 0.09

Fe2O3 0.53

L O I 0.39

Intended Use: This reference material is designed to be included with every

batch of samples analysed and the results plotted for quality

monitoring purposes.

Stability: The container (jar or sachet) and its contents should not be

heated to temperatures higher than 50 °C. The reference

material is stable, with weight changes of less than 0.5 % at

extremes of naturally occurring temperature and humidity

conditions.

Method of Preparation: Pulverized feldspar minerals were blended with finely

pulverized and screened, gold-containing minerals. Once the

powders were uniformly mixed the composite was placed into

1321 wide-mouthed jars, each bearing a unique number. 40

jars were randomly selected from the packaging run and

material from these jars was used for both homogeneity and

consensus testing.


Homogeneity Assessment:

An independent laboratory carried out all gold analyses by fire assay of 30 g portions,

using a gravimetric finish with a balance capable of reading to one microgram. Steps

were taken to minimize laboratory method variation in order to better detect any

variation in the candidate reference material.

Homogeneity Assessment After Packaging

The contents of five randomly selected jars were compacted by vibration (to simulate

the effect of freighting) and five samples removed successively from top to bottom

from each jar. In addition, five samples were removed from the last jar in the series.

A sample was removed from the top of each of the 40 jars randomly selected from the

1321 jars in the batch. The results of analysis of the 70 samples (randomly ordered

and then consecutively numbered before being sent to the laboratory) produced a

coefficient of variation of 1.2 %.

Analytical Methodology:

Once homogeneity had been established, two sub-samples were submitted to a

number of well-recognized laboratories in order to assign a gold value by consensus

testing. The sub-samples were drawn from the 40 randomly selected jars and each

laboratory received samples from two different jars. Indicative concentration ranges

were given. All laboratories used fire assay for the gold analysis.

Calculation of Certified Value:

Results for gold were returned from 29 laboratories. Statistical analysis to identify

outliers was carried out using the principles detailed in sections 7.3.2 – 7.3.4, ISO

5725-2: 1994. Assessment of each laboratory’s performance was carried out on the

basis of z-scores, partly based on the concept described in ISO/IEC Guide 43-1.

Details of the criteria used in these examinations are available on request. As a result

of these statistical analyses, five sets of results were excluded for the purpose of

assigning a gold concentration value to this reference material. A recommended

value was thus calculated from the average of the remaining n = 24 sets of replicate

results. The 95 % confidence interval was estimated using the formula:-

X ts/√n

(where X is the estimated average, s is the estimated standard deviation of the

laboratory averages, and t is the 0.025 tail-value from Student’s t-distribution with n-

1 degrees of freedom). The recommended value is provided at the beginning of the

certificate in µg/g (ppm) units. A summary of the results used to calculate the

recommended value is listed on page 4 and the names of the laboratories that

submitted results are listed on page 5.


Summary of Results Used to Calculate Gold Value (not related to order of laboratories listed on page 5)

Gold (ppm)

Sample 1 Sample 2 Average

2.245 2.250 2.248

2.318 2.294 2.306

2.33 2.34 2.333

2.31 2.37 2.340

2.33 2.37 2.349

2.345 2.355 2.350

2.370 2.355 2.363

2.39 2.36 2.373

2.360 2.385 2.373

2.37 2.39 2.380

2.374 2.395 2.385

2.42 2.35 2.385

2.36 2.42 2.390

2.41 2.37 2.390

2.40 2.40 2.400

2.390 2.414 2.402

2.41 2.40 2.405

2.40 2.41 2.405

2.42 2.42 2.420

2.38 2.48 2.430

2.417 2.463 2.440

2.42 2.47 2.445

2.45 2.44 2.445

2.445 2.460 2.453

Average of 24 sets = 2.384 ppm

Standard deviation of 24 sets = 0.048 ppm

Coefficient of variation = 2.0 %

95% Confidence interval for average = 0.020 ppm

Statistical analysis of both homogeneity and consensus test results has been carried

out by independent statistician, Tim Ball.


Participating Laboratories

Australia ALS Chemex, Perth

Amdel Ltd, Adelaide

Amdel Laboratories Ltd, Perth

Amdel Ltd, Kalgoorlie

Genalysis Laboratory Services Pty Ltd, Perth

SGS Australia Pty Ltd, Perth

SGS Australia Pty Ltd, Townsville

Standard and Reference Laboratories, Perth

Ultra Trace Analytical Laboratories, Perth

Canada Accurassay Laboratories, Ontario

Acme Analytical Laboratories Ltd, British Columbia

ALS Chemex, British Columbia

ALS Chemex, Quebec

Assayers Canada, British Columbia

Bourlamaque Assay Laboratories Ltd, Quebec

International Plasma Labs Ltd, British Columbia

Loring Laboratories Ltd, Alberta

TSL Laboratories Inc, Saskatchewan

Kyrgyzstan Alex Stewart Assay and Environmental Laboratories Ltd

New Zealand Amdel Ltd, Otago

SGS New Zealand Ltd, Waihi

Russia Irgiredmet, Irkutsk

Norilsk Nickel, Trans-Polar Division

Russian Academy of Science, Karelia

South Africa MINTEK, Analytical Science Division

SGS Lakefield Research Africa (Pty) Ltd

United States of America ALS Chemex, Nevada

Barrick Goldstrike Mines Inc, Nevada

Newmont Mining Corporation, Nevada


Instructions and Recommendations for Use:

Weigh out quantity usually used for analysis and analyze for total gold by normal

procedure. Homogeneity testing has shown that consistent results are obtainable for gold

when 30g portions are taken for analysis.

We quote a 95% confidence interval for our estimate of the declared value. This

confidence interval reflects our uncertainty in estimating the true value for the gold

content of the reference material. The interval is chosen such that, if the same procedure as

used here to estimate the declared value were used again and again, then 95% of the trials

would give intervals that contained the true value. It is a reflection of how precise the trial

has been in estimating the declared value. It does not reflect the variability any particular

laboratory will experience in its own repetitive testing.

Some users in the past have misinterpreted this confidence interval as a guide as to how

different an individual test result should be from the declared value. Some mistakenly use

this interval to set limits for control charts on their own routine test results using the

reference material. Such use inevitably leads to many apparent out-of-control points,

leading to doubts about the laboratory’s testing, or of the reference material itself.

A much better way of determining the laboratory performance for testing the reference

material is to accumulate a history of the test results obtained, and plot them on a control

chart. The appropriate centre line and control limits for this chart should be based on the

average level and variability exhibited in the laboratory’s own data. This chart will

provide a clear picture of the long-term stability or otherwise of the laboratory testing

process, providing good clues as to the causes of any problems. To help our customers do

this more simply for themselves, we can provide a free Excel template that will produce

sensible graphs, with intelligently chosen limits, from the customer’s own data.

Legal Notice:

This certificate and the reference material described in it have been prepared with due care

and attention. However ROCKLABS Ltd, Malcolm Smith Reference Materials Ltd and

Tim Ball Ltd accept no liability for any decisions or actions taken following the use of the

reference material.

References:

For further information on the preparation and validation of this reference material please

contact Malcolm Smith.

Certifying Officer Independent Statistician

M G Smith BSc, FNZIC Tim Ball BSc (Hons)

Certificate of Analysis, ROCKLABS Reference Material OxJ64, 23 October 2007. Page 1 of 6.

161 Neilson Street, Auckland, New Zealand Email: [email protected]

Tel: +64 9 634 7696 Fax: +64 9 634 6896 Website: www.rocklabs.com Certificate of Analysis








40 Oakford Park Crescent, Greenhithe

North Shore City 0632

NEW ZEALAND


Telephone: +64 9 444 3534

Date of Certification: 23 October 2007






Origin of Reference Material: Basalt and feldspar minerals with minor

quantities of finely divided gold-containing

minerals that have been screened to ensure there

is no gold nugget effect.


P O Box 18 142

Auckland

NEW ZEALAND



Telephone: +64 9 634 7696


Description: The reference material is a light grey powder that has been

well mixed and a homogeneity test carried out after the entire

batch was packaged into wide-mouthed jars. There is no soil

component. The product contains crystalline quartz and

therefore dust from it should not be inhaled.



%

SiO2 61.68

Al2O3 17.60

Na2O 6.78

K2O 3.36

CaO 2.51

MgO 2.68

TiO2 0.73

MnO 0.06

P2O5 0.23

Fe2O3 3.88

L O I 0.31








conditions.

Method of Preparation: Pulverized basalt rock and feldspar minerals were blended

with finely pulverized and screened, gold-containing

minerals. Once the powders were uniformly mixed the

composite was placed into 1539 wide-mouthed jars, each

bearing a unique number. 48 jars were randomly selected

from the packaging run and material from these jars was used

for both homogeneity and consensus testing.




using a gravimetric finish. Steps were taken to minimize laboratory method variation

in order to better detect any variation in the candidate reference material.


The contents of six randomly selected jars were compacted by vibration (to simulate



A sample was also removed from the top of each of the 48 jars randomly selected

from the 1539 jars in the batch. The results of analysis of the 83 samples (randomly

ordered and then consecutively numbered before being sent to the laboratory)

produced a coefficient of variation (COV) of 3.2 %. This unexpectedly high CoV

was due to one spuriously high result. Further samples were subsequently analyzed

from the jar that produced the high result as well as from adjacent jars, with no other

high results being obtained. The cause of this single high result is unknown. If the

one high result is omitted, the coefficient of variation of the remaining 82 results is

1.0%.













of these statistical analyses, four sets of results were excluded for the purpose of




X ± ts/√n











Gold (ppm)


2.22 2.18 2.200

2.22 2.23 2.225

2.221 2.262 2.2415

2.31 2.29 2.300

2.293 2.310 2.3015

2.31 2.32 2.315

2.36 2.29 2.325

2.34 2.31 2.325

2.350 2.325 2.3375

2.33 2.36 2.345

2.369 2.324 2.3465

2.361 2.362 2.3615

2.40 2.34 2.370

2.34 2.40 2.370

2.36 2.38 2.370

2.314 2.434 2.3740

2.34 2.41 2.375

2.39 2.38 2.385

2.41 2.37 2.390

2.41 2.39 2.400

2.383 2.434 2.4085

2.43 2.39 2.410

2.455 2.465 2.4600

2.46 2.47 2.465

2.449 2.485 2.4670

2.417 2.520 2.4685

2.550 2.567 2.5585





Note: this standard deviation should not be used as

a basis to set control limits when plotting results

from an individual laboratory.



Australia ALS Chemex, Perth

Amdel Ltd, Adelaide


Amdel Laboratories Ltd, Kalgoorlie


SGS Welshpool Minerals, Perth

SGS Townsville Minerals, Townsville



Canada ALS Chemex, British Columbia

ALS Chemex, Quebec




Loring Laboratories, Alberta

SGS Minerals Services, Ontario


Chile ACME Analytical Laboratories Ltda


New Zealand SGS Minerals, Waihi

Peru Minera Yanacocha SRL – Newmont

Russia Irgiredmet, Irkutsk


South Africa Anglo Research

MINTEK: Analytical Services Division

SGS Lakefield Research Africa



Newmont Mining Corporation, Carlin Laboratory

Newmont Mining Corporation, Lone Tree Laboratory

Newmont Mining Corporation, Twin Creeks Laboratory















this interval, or the standard deviation from the consensus test, to set limits for control

charts on their own routine test results using the reference material. Such use inevitably

leads to many apparent out-of-control points, leading to doubts about the laboratory’s

testing, or of the reference material itself.

A much better way of determining the laboratory performance when analysing the

reference material is to accumulate a history of the test results obtained, and plot them on a

control chart. The appropriate centre line and control limits for this chart should be based

on the average level and variability exhibited in the laboratory’s own data. This chart will





Legal Notice:




reference material.

References:





Certificate of Analysis, ROCKLABS Reference Material OxJ120. 26 November 2013. Page 1 of 6

P.O Box 18-142, Glen Innes 1743 Auckland, New Zealand.

P 64 9 634 7696 F 64 9 634 6896 E [email protected]

www.rocklabs.com

World Leaders in Sample Preparation Equipment,

Automated Systems and Certified Reference Materials






within the following range: 352 342– 356 598.

Prepared and Certified By: Brett Coombridge, M.Phil. Chemistry

Rocklabs Reference Materials

P.O. Box 316056

Wairau Valley Post Centre

Auckland 0760

NEW ZEALAND


Telephone: +64 9 444 3534

Date of Certification: 26 November 2013










Supplier of Reference Material: ROCKLABS

P O Box 18 142

Glen Innes

Auckland 1743

NEW ZEALAND



http://www.rocklabs.com/









%

SiO2 59.36

Al2O3 17.11

Na2O 4.97

K2O 5.59

CaO 3.33

MgO 3.18

TiO2 0.88

MnO 0.06

P2O5 0.23

Fe2O3 4.71

L O I 0.24



monitoring and assessment purposes.

Stability: The container (jar or sachet) should not be heated to

temperatures higher than 50 °C. The reference material is

stable, with weight changes of less than 0.5 % at extremes of

naturally occurring temperature and humidity conditions.


with finely pulverized and screened gold-containing minerals.

Once the powders were uniformly mixed the composite was

placed into 4257 wide-mouthed jars, each bearing a unique

number. 75 jars were randomly selected from the packaging

run and material from these jars was used for both

homogeneity and consensus testing.


Sampling (described below) was performed by Rocklabs Reference Materials and an

independent laboratory carried out gold analysis of the samples by fire assay of 30 g

portions, using an ICP finish. Steps were taken to minimize laboratory method

variation to better detect any variation in the candidate reference material.


Homogeneity: A sample was removed from the top of each of the 75 jars randomly

selected from the 4257 jars in the batch. The results of analysis of the 75 samples

(randomly ordered then consecutively numbered before being sent to the laboratory)

produced a relative standard deviation of 1.1%.

Settling: The contents of 6 randomly selected jars were compacted by vibration (to

simulate the effect of freighting) and 5 samples were removed successively from top

to bottom from each jar. In addition, 5 samples were removed from the last jar in the

series. No top to bottom gradation in the gold values was observed neither was there

a significant difference between the last jar and the other jars.




testing. The sub-samples were drawn from 75 randomly selected jars and each

laboratory received samples from two different jars.

Participating laboratories analysed the samples by fire assay followed by either

gravimetric or instrument finish (AAS or ICP). Indicative concentration ranges were

provided. Some laboratories analysed the samples twice using both methods. In this

situation both sets of results were presented separately, and included in the statistical

analysis. The amount of sample used in the analyses varied between laboratories

(range 15 - 50g).


As some laboratories returned results for two different methods, 58 sets of gold

results were returned from 54 laboratories. Statistical analysis to identify outliers was

carried out using the principles detailed in sections 7.3.2 – 7.3.4, ISO 5725-2: 1994.

Assessment of each laboratory’s performance was carried out on the basis of z-scores,

partly based on the concept described in ISO/IEC Guide 43-1. Details of the criteria

used in these examinations are available on request. As a result of these statistical

analyses, 5 sets of results were excluded for the purpose of assigning a gold

concentration value to this reference material. A recommended value was thus

calculated from the average of the remaining n = 53 sets of replicate results. The

95% confidence interval was estimated using the formula:-

X ts/√n






submitted results are listed on page 5. The results are listed in increasing order of the

individual laboratory averages.

Statistical analysis of the consensus test results has been carried out by independent

statistician, Tim Ball.


Summary of Results Used to Calculate Gold Value (Listed in increasing order of individual laboratory averages)

Note: Neither the Standard deviation nor the Confidence interval should be

used as a basis to set control limits when plotting individual laboratory results.

See notes under "Instructions and Recommendations for Use" (pg 6)

Sample 1 Sample 2 Set Average2.256 2.258 2.257

2.27 2.25 2.26

2.28 2.24 2.26

2.26 2.29 2.275

2.333 2.225 2.279

2.28 2.31 2.295

2.32 2.28 2.3

2.31 2.29 2.3

2.27 2.34 2.305

2.28 2.33 2.305

2.255 2.363 2.309

2.350 2.270 2.31

2.35 2.32 2.335

2.32 2.35 2.335

2.35 2.32 2.335

2.340 2.335 2.3375

2.26 2.42 2.34

2.328 2.361 2.3445

2.32 2.37 2.345

2.389 2.312 2.3505

2.357 2.345 2.351

2.37 2.34 2.355

2.254 2.458 2.356

2.374 2.340 2.357

2.360 2.355 2.3575

2.36 2.36 2.36

2.34 2.38 2.36

2.350 2.371 2.3605

2.36 2.37 2.365

2.34 2.39 2.365

2.348 2.385 2.3665

2.385 2.350 2.3675

2.36 2.38 2.37

2.346 2.404 2.375

2.31 2.44 2.375

2.330 2.425 2.3775

2.410 2.345 2.3775

2.43 2.33 2.38

2.37 2.40 2.385

2.38 2.40 2.39

2.42 2.36 2.39

2.41 2.38 2.395

2.37 2.42 2.395

2.40 2.41 2.405

2.422 2.414 2.418

2.47 2.37 2.42

2.40 2.45 2.425

2.44 2.42 2.43

2.50 2.42 2.46

2.46 2.47 2.465

2.52 2.51 2.515

2.518 2.527 2.5225

2.59 2.54 2.565


Standard deviation of 53 sets = 0.063 ppmRelative standard deviation = 2.7 %95% Confidence interval for average: = +/- 0.017 ppm

Gold (ppm)



Australia ALS Minerals, Burnie

ALS Minerals, Kalgoorlie

ALS Minerals, Orange

ALS Minerals, Perth

ALS Minerals, Townsville

Bureau Veritas Amdel, Adelaide

Bureau Veritas Amdel, Kalgoorlie

Intertek Genalysis Laboratory Services, Perth

Burkina Faso ALS Minerals, Burkina Faso

SEMAFO Burkina Faso S.A.

Canada Acme Analytical Laboratories, Vancouver

ALS Minerals, Val-d’Or

ALS Minerals, Vancouver

Bourlamaque, Quebec

Loring Laboratories (Alberta) Ltd, Calgary

SGS Minerals Services, Lakefield, Ontario

SGS Minerals Services, Vancouver

Techni-Lab S.G.B. Abitibi Inc/Actlabs, Val d’Or

Techni-Lab S.G.B. Abitibi Inc/Actlabs, Ste-Germaine-Boule

TSL Laboratories Inc, Saskatoon

Chile Acme Analytical Laboratories, Santiago

Côte d’Ivoire Bureau Veritas Mineral Laboratories, Abidjan

Ghana ALS Minerals, Kumasi

SGS Performance Lab, Obuasi AngloGold

Ireland ALS Minerals, Loughrea

Kyrgyz Republic Stewart Assay and Environmental Laboratories LLC, Kara-Balta

Laos ALS Geochemistry, Vientiane

Mali ALS Minerals, Bamako

Mongolia ALS Minerals, Ulaanbaatar

Namibia Bureau Veritas- Mineral Laboratories, Swakopmund

New Zealand SGS New Zealand Ltd, Otago

SGS New Zealand Ltd, Reefton


Peru ALS Minerals, Lima

Inspectorate Services Perú S.A.C., Callao

Minera Yanacocha SRL – Newmont, Lima

Romania ALS Minerals, Rosia Montana

Russia Irgiredmet Analytical Centre, Irkutsk

South Africa AB Analytical Laboratory Services, Boksburg

Acme, Inspectorate M & M, Rustenburg

ALS Minerals, Edenvale

SibanyeGold, Driefontein Operations

Performance Laboratories, Barberton

Performance Laboratories, Randfontein

Performance Laboratories, Allanridge

Turkey Acme Analitik Laboratuar Hizmetleri Ltd, Sirketi

ALS Minerals, Izmir

USA ALS Minerals, Reno

Barrick Goldstrike – Met Services, Nevada

Inspectorate, Sparks

Newmont Mining Corporation, Carlin

Newmont Mining Corporation, Lone Tree

Newmont Mining Corporation, Twin Creeks

Zimbabwe Performance Laboratories, Ruwa



Weigh out quantity usually used for analysis, and analyse for total gold by normal






















this, we can provide a free Excel template that will produce sensible graphs, with

intelligently chosen limits, from the customer’s own data.

Legal Notice:


and attention. However ROCKLABS Ltd, Scott Technology Ltd and Tim Ball Ltd accept

no liability for any decisions or actions taken following the use of the reference material.

References:


contact Brett Coombridge.


Brett Coombridge (M.Phil. Chemistry) Tim Ball BSc (Hons)


P.O Box 18-142, Glen Innes 1743 Auckland, New Zealand.

P 64 9 634 7696 F 64 9 634 6896 E [email protected]

www.rocklabs.com

World Leaders in Sample Preparation Equipment,

Automated Systems and Certified Reference Materials








Rocklabs Reference Materials


Auckland 0632

NEW ZEALAND


Telephone: +64 9 444 3534











Supplier of Reference Material: ROCKLABS

P O Box 18 142

Glen Innes

Auckland 1743

NEW ZEALAND











%

SiO2 58.18

Al2O3 17.17

Na2O 5.08

K2O 4.66

CaO 3.94

MgO 3.63

TiO2 1.01

MnO 0.07

P2O5 0.25

Fe2O3 5.33

L O I 0.51




Stability: The container (jar or sachet) should not be heated to

temperatures higher than 50 °C. The reference material is

stable, with weight changes of less than 0.5 % at extremes of

naturally occurring temperature and humidity conditions.










An independent laboratory carried out gold analysis by fire assay of 30 g portions,









produced a relative standard deviation of 1.0 %.






were given. All laboratories used fire assay for the gold analysis, with most using an

instrument finish and 3 using a gravimetric finish.







of these statistical analyses, eight sets of results were excluded for the purpose of




X ± ts/√n












Sample 1 Sample 2 Average2.07 2.22 2.145

2.190 2.210 2.2002.27 2.26 2.265

2.28 2.25 2.2652.30 2.29 2.2952.24 2.35 2.295

2.283 2.312 2.2982.33 2.27 2.300

2.31 2.29 2.3002.314 2.314 2.3142.29 2.34 2.315

2.360 2.271 2.3152.285 2.360 2.323

2.283 2.364 2.3242.315 2.332 2.3242.35 2.30 2.325

2.28 2.37 2.3252.33 2.33 2.330

2.33 2.33 2.3302.348 2.317 2.3332.320 2.348 2.334

2.35 2.32 2.3352.32 2.36 2.3402.350 2.335 2.343

2.342 2.347 2.3442.343 2.353 2.348

2.345 2.36 2.3532.351 2.357 2.3542.357 2.357 2.357

2.37 2.36 2.3652.360 2.375 2.368

2.38 2.36 2.3702.461 2.288 2.3752.42 2.34 2.380

2.480 2.2855 2.3832.410 2.365 2.388

2.40 2.39 2.3952.39 2.40 2.3952.40 2.42 2.410

2.420 2.404 2.4122.46 2.44 2.450

2.46 2.45 2.455Average of 42 sets = 2.337 ppm


Relative standard deviation = 2.4 %95% Confidence interval for average = 0.018 ppm

Gold (ppm)

Note: this standard deviation should not be used as a

basis to set control limits when plotting results from an

individual laboratory.



Australia ALS Minerals, Kalgoorlie

ALS Minerals, Perth

ALS Minerals, Townsville

Bureau Veritas Amdel, Adelaide

Bureau Veritas Amdel, Kalgoorlie

Intertek Genalysis Laboratory Services, Perth

SGS Minerals Services, Perth

Ultra Trace – Bureau Veritas, Perth

Burkina Faso ALS Minerals, Burkina Faso

Semafo Burkina Faso S.A.

Canada Acme Analytical Laboratories, Vancouver

ALS Minerals, Val d’Or

ALS Minerals, Vancouver

Loring Laboratories (Alberta) Ltd, Calgary

SGS Minerals Services, Lakefield

SGS Minerals Services, Vancouver

Techni-Lab S.G.B. Abitibi Inc/Actlabs, Québec


Chile Acme Analytical Laboratories, Santiago

ALS Minerals, La Serena

Côte d’Ivoire Bureau Veritas Mineral Laboratories, Abidjan

Ireland OMAC Laboratories Ltd

Kyrgyz Republic Stewart Assay and Environmental Laboratories LLC, Kara-Balta

Mali ALS Minerals, Bamako

Namibia Bureau Veritas- Mineral Laboratories, Swakopmund

New Zealand SGS New Zealand Ltd, Otago

SGS New Zealand Ltd, Reefton


Peru ALS Minerals, Lima

Inspectorate Services Perú S.A.C., Callao


Romania ALS Minerals, Rosia Montana

Russia Irgiredmet Analytical Centre, Irkutsk


ALS Minerals, Modderfontein

AngloGold Ashanti, Vaal River Chemical Laboratory - Metallurgy

Gold Fields West Wits Analytical Laboratory


Performance Laboratories, Barberton


SGS South Africa (Pty) Ltd, Johannesburg

Turkey Acme Analitik Laboratuar Hizmetleri Ltd, Sirketi

ALS Minerals, Izmir

United Kingdom Inspectorate International, Essex

USA Acme Analytical Laboratories, Alaska

ALS Minerals, Reno

Barrick Goldstrike – Met Services

Inspectorate, Sparks


Zimbabwe Performance Laboratories, Ruwa

























this, we can provide a free Excel template that will produce sensible graphs, with

intelligently chosen limits, from the customer’s own data.

Legal Notice:


and attention. However ROCKLABS Ltd, Scott Technology Ltd and Tim Ball Ltd accept

no liability for any decisions or actions taken following the use of the reference material.

References:





Certificate of Analysis, ROCKLABS Reference Material OxJ80, 19 April, 2010. Page 1 of 6.











NEW ZEALAND


Telephone: +64 9 444 3534

Date of Certification: 19 April 2010











P O Box 18 142

Auckland 1743

NEW ZEALAND



Telephone: +64 9 634 7696









%

SiO2 58.31

Al2O3 16.98

Na2O 4.32

K2O 6.04

CaO 4.43

MgO 2.61

TiO2 0.78

MnO 0.06

P2O5 0.23

Fe2O3 4.15

L O I 1.65








conditions.









An independent laboratory carried out gold analysis by fire assay of 30 g portions,




Homogeneity Assessment continued:







produced a relative standard deviation of 1.2 %.






were given. All laboratories used fire assay for the gold analysis, with most using an

instrument finish and some a gravimetric finish.







of these statistical analyses, seven sets of results were excluded for the purpose of




X ± ts/√n












Gold (ppm)


2.270 2.240 2.255

2.27 2.27 2.270

2.244 2.302 2.273

2.27 2.28 2.275

2.290 2.267 2.279

2.29 2.27 2.280

2.28 2.29 2.285

2.314 2.268 2.291

2.30 2.31 2.305

2.31 2.30 2.305

2.30 2.31 2.305

2.32 2.30 2.310

2.326 2.295 2.311

2.31 2.32 2.315

2.33 2.31 2.320

2.321 2.323 2.322

2.342 2.305 2.324

2.32 2.33 2.325

2.34 2.31 2.325

2.336 2.321 2.329

2.31 2.35 2.330

2.34 2.32 2.330

2.33 2.34 2.335

2.34 2.35 2.345

2.36 2.35 2.355

2.390 2.325 2.358

2.38 2.340 2.360

2.36 2.37 2.365

2.38 2.37 2.375

2.37 2.38 2.375

2.39 2.38 2.385

2.41 2.36 2.385

2.38 2.40 2.390

2.40 2.40 2.400

2.410 2.390 2.400

2.41 2.43 2.420



Relative standard deviation = 1.8 %







Australia ALS Mineral, Kalgoorlie

ALS Mineral, Orange

ALS Mineral, Perth

ALS Mineral, Townsville

Amdel Ltd, Adelaide

Amdel Ltd, Kalgoorlie

Genalysis Laboratory Services, Perth

Independent Assay Laboratories, Perth



Ultra Trace Pty Ltd, Perth

Burkina Faso ALS Mineral, Burkina Faso

Canada Acme Analytical Laboratories Ltd, Vancouver

ALS Mineral, Val d’Or

ALS Mineral, Vancouver

Assayers Canada, Vancouver

International Plasma Labs Ltd, Richmond

Loring Laboratories Ltd, Calgary

SGS Mineral Services, Lakefield

Techni-Lab S.G.B. Abitibi Inc, Quebec


Chile Acme Analytical Laboratories Ltd, Santiago

ALS Mineral, La Serena

Kyrgyzstan Stewart Assay and Environmental Laboratories LLC, Kara-Balta

Malaysia Performance Laboratories, Raub

Mali ALS Mineral, Bamako

New Zealand Amdel Ltd, Reefton

SGS Minerals Services, Waihi

Peru ALS Mineral, Lima

Inspectorate Services Peru S.A.C., Callao



ALS Mineral, Johannesburg

Anglo Research, Johannesburg

Goldfields West Wits Analytical Laboratory



SGS South Africa (Pty) Ltd, Johannesburg

UK Inspectorate International Ltd, Essex

USA ALS Mineral, Reno

Barrick Goldstrike – Met Services





























Legal Notice:




reference material.

References:






161 Neilson Street, Auckland, New Zealand Email: [email protected]

Tel: +64 9 634 7696 Fax: +64 9 634 6896 Website: www.rocklabs.com Certificate of Analysis










NEW ZEALAND


Telephone: +64 9 444 3534












P O Box 18 142

Auckland

NEW ZEALAND



Telephone: +64 9 634 7696









%

SiO2 60.82

Al2O3 17.72

Na2O 6.18

K2O 4.43

CaO 2.75

MgO 2.65

TiO2 0.75

MnO 0.06

P2O5 0.25

Fe2O3 3.93

L O I 0.36








conditions.




















produced a coefficient of variation (COV) of 1.1 %.













of these statistical analyses, four sets of results were excluded for the purpose of




X ± ts/√n









Gold (ppm)


2.19 2.20 2.195

2.270 2.205 2.2375

2.27 2.27 2.270

2.30 2.25 2.275

2.297 2.275 2.2860

2.309 2.294 2.3015

2.31 2.30 2.305

2.320 2.295 2.3073

2.315 2.300 2.3075

2.310 2.315 2.3125

2.290 2.340 2.3150

2.26 2.37 2.315

2.32 2.34 2.330

2.30 2.37 2.335

2.340 2.350 2.3450

2.34 2.35 2.345

2.338 2.357 2.3475

2.345 2.380 2.3625

2.335 2.405 2.3700

2.343 2.398 2.3705

2.3590 2.3915 2.3753

2.37 2.39 2.380

2.37 2.42 2.395

2.42 2.41 2.415

2.45 2.39 2.420

2.47 2.38 2.425

2.4330 2.4495 2.4413

2.462 2.522 2.4920












Australia Amdel Ltd, Adelaide


Amdel Laboratories Ltd, Kalgoorlie



SGS Townsville Minerals, Townsville



Canada Accurassay Laboratories, Ontario

Acme Analytical Laboratories Ltd, British Columbia

ALS Chemex, British Columbia

ALS Chemex, Quebec




Loring Laboratories Ltd, Alberta

SGS Minerals Services, Ontario


Chile Acme Analytical Laboratories S.A.


New Zealand Amdel NZ Ltd, Macraes, Otago

SGS Minerals, Waihi

Peru Minera Yanacocha SRL – Newmont

Russia Irgiredmet JSC, Irkutsk


South Africa Anglo Research, Johannesburg

SGS South Africa Pty Ltd, Johannesburg

MINTEK: Analytical Services Division, Randburg































Legal Notice:




reference material.

References:





Certificate of Analysis, ROCKLABS Reference Material OxJ36, 29 July 2004. Page 1 of 5.



Recommended Gold Concentration: 2.398 µg/g 95% Confidence Interval: +/- 0.031 µg/g

The above values apply only to product in jars or sachets which have an identification number within the following range: (The unique number range is not published on website)

Prepared and Certified By: Malcolm Smith BSc, FNZIC Malcolm Smith Reference Materials Ltd 40 Oakford Park Crescent, Greenhithe, Auckland 1311 NEW ZEALAND Email: [email protected] Telephone: +64 9 444 3534 Fax: +64 9 444 7739

Date of Certification: 29 July 2004


Available Packaging: This reference material has been packed in wide-mouthed jars that contain 2.5kg of product. The contents of some jars may be subsequently repacked into sealed polyethylene sachets.

Origin of Reference Material: Feldspars with minor quantities of finely divided gold-containing minerals that have been screened to ensure there is no gold nugget effect.

Supplier of Reference Material: ROCKLABS Ltd P O Box 18 142 Auckland NEW ZEALAND Email: [email protected] Telephone: +64 9 634 7696 Fax: +64 9 634 6896

Description: The component minerals have been well mixed and a homogeneity test carried out after the entire batch was packaged into wide-mouthed jars to ascertain that the gold is


evenly distributed throughout the reference material. There is no soil component. The product contains crystalline quartz and therefore dust from it should not be inhaled.


(Uncertified Values) % SiO2 67.84

Al2O3 19.42

Na2O 10.89

K2O 0.29

CaO 0.33

MgO 0.14

TiO2 0.04

MnO 0.01

P2O5 0.08

Fe2O3 0.56

L O I 0.40

Intended Use: This reference material is designed to be included with every batch of samples analysed and the results plotted for quality monitoring purposes.

Stability: The container (jar or sachet) and its contents should not be heated to temperatures higher than 50 °C. The reference material is stable, with weight changes of less than 0.5% at extremes of naturally occurring temperature and humidity conditions.

Instructions for Use: Weigh out quantity usually used for analysis and analyze for total gold by normal procedure. Homogeneity testing has shown that consistent results are obtainable for gold when 30g portions are taken for analysis. Homogeneity cannot be guaranteed if smaller weights are taken for analysis.

Method of Preparation: Pulverized feldspar minerals were blended with finely pulverized and screened, gold-containing minerals. Once the powders were uniformly mixed the composite was placed into 749 wide-mouthed jars, each bearing a unique number. 30 jars were randomly selected from the packaging run and material from these jars was used for both homogeneity and consensus testing.

Homogeneity Assessment: An independent laboratory carried out all gold analyses by fire assay of 30g portions, using a gravimetric finish with a balance capable of reading to one microgram. Steps were taken to minimize laboratory method variation in order to better detect any variation in the reference material. Homogeneity Assessment Prior to Packaging


30 samples were removed at regular intervals from the prepared candidate reference material prior to packaging into 2.5 kg jars. The results of analysis of the 30 samples produced a coefficient of variation of 0.6%. Homogeneity Assessment After Packaging The contents of three randomly selected jars were compacted by vibration (to simulate the effect of freighting) and five samples removed successively from top to bottom from each of the three jars. In addition, five samples were removed from the last jar in the series. 30 samples were removed from the top of 30 jars randomly selected from the 749 jars in the batch. The results of analysis of the 50 samples produced a coefficient of variation of 0.7%. As the homogeneity testing was carried out using 30g analytical portions, the same degree of homogeneity cannot be guaranteed if smaller weights are taken for analysis.

Analytical Methodology: Once homogeneity had been established, two sub-samples were submitted to a number of well-recognized laboratories in order to assign a gold value by consensus testing. The sub-samples were drawn from the 30 randomly selected jars and each laboratory received samples from two different jars. Indicative concentration ranges were given. All laboratories used fire assay for the gold analysis.


27 sets of results for gold were returned from 27 laboratories. Statistical analysis to identify outliers was carried out using the principles detailed in sections 7.3.2 – 7.3.4, ISO 5725-2: 1994. Assessment of each laboratory’s performance was carried out on the basis of z-scores, partly based on the concept described in ISO/IEC Guide 43-1. Details of the criteria used in these examinations are available on request. As a result of these statistical analyses, three sets of results were excluded for the purpose of assigning a gold concentration value to this reference material. A recommended value was thus calculated from the average of the remaining n = 24 sets of replicate results. The 95% confidence interval was estimated using the formula:-

X ± ts/�n (where X is the estimated average, s is the estimated standard deviation of the laboratory averages, and t is the 0.025 tail-value from Student’s t-distribution with n-1 degrees of freedom). The recommended value is provided at the beginning of the certificate in µg/g (ppm) units. A summary of the results used to calculate the recommended value is listed on page 4 and the names of the laboratories that submitted results are listed on page 5.

Legal Notice:

This certificate and the reference material described in it have been prepared with due care and attention. However ROCKLABS Ltd, Malcolm Smith Reference Materials Ltd and Tim Ball Ltd accept no liability for any decisions or actions taken following the use of the reference material.



Statistical analysis of both homogeneity and consensus test results has been carried out by an independent statistician.


Australia Amdel Laboratories Ltd, Adelaide Amdel Ltd, Perth

Amdel Ltd, Kalgoorlie Genalysis Laboratory Services Pty Ltd, Perth SGS Australia Pty Ltd, Perth SGS Australia Pty Ltd, Townsville

Gold (ppm)Sample 1 Sample 2 Average

2.217 2.273 2.2452.195 2.325 2.2602.342 2.279 2.3112.33 2.34 2.3352.33 2.37 2.3502.35 2.35 2.3502.35 2.35 2.350

2.320 2.390 2.3552.379 2.351 2.3652.30 2.46 2.3802.40 2.40 2.4002.40 2.40 2.4002.37 2.43 2.4002.40 2.43 2.4152.41 2.43 2.4202.40 2.45 2.4252.54 2.33 2.435

2.441 2.449 2.4452.45 2.46 2.455

2.467 2.456 2.4622.47 2.46 2.465

2.475 2.480 2.4782.466 2.495 2.4812.580 2.548 2.564

Average of 24 sets = 2.398 ppmStandard deviation of 24 sets = 0.073 ppm

Coefficient of variation = 3.0 %95% Confidence interval for average = 0.031 ppm



Brazil Lakefield Geosol Laboratorios Ltda

Canada Acme Analytical Laboratories Ltd, British Columbia Activation Laboratories Ltd, Ontario ALS Chemex, British Columbia ALS Chemex Chimitec, Quebec Bourlamaque Assay Laboratories Ltd, Quebec SGS Lakefield Research Limited, Ontario

Ireland OMAC Laboratories Ltd

New Zealand Amdel NZ Ltd, Otago SGS New Zealand Ltd, Waihi

Russia Irgiredmet, Irkutsk Magadangeologia, Magadan Norilsk Nickel, Trans-Polar division Russian Academy of Science, Karelia Tsnigri, Moscow

South Africa Anglo American Research Laboratories AngloGold Ashanti West Wits SGS Lakefield Research Africa

United States of America Barrick Goldstrike Mines Inc, Nevada Newmont Mining Corporation, Nevada

References: For further information on the preparation and validation of this reference material please contact Malcolm Smith.



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