Fundão Tailings Dam Review Panel Report on the Immediate Causes of the Failure of the Fundão Dam Appendix C – Field Geotechnical Data and Interpretation

August 25, 2016

ATTACHMENT C6 Field Laboratory Test Data

Figure C.C6-1 Germano Slimes – Particle Size Distribution

Figure C.C6-2 Germano Slimes – Sensitivity vs. Depth

Figure C.C6-3 Germano Slimes – Calibration of CPT Soundings with Nilcon Field Vane

Figure C.C6-4 Germano Pit Dam – Sand - Northeast – Particle Size Distribution

Figure C.C6-5 Germano Pit Dam – Sand - Southwest – Particle Size Distribution

Fundão Tailings Dam Review Panel

Germano SlimesParticle Size Distribution

C.C6-1FIG. No.

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PROJECT

0

10

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80

90

100

0.0010.010.11101001000

Perc

ent F

iner

by

Wei

ght (

%)

Grain Size (mm)

SIEVE OPENINGS IN INCHES U.S. SIEVE NUMBERSl

COBBLESGRAVEL SAND

CLA

Y

coarse fine coarse finemediumSILT

8 6 3 1.5 3/4 3/8 4 10 20 40 60 100 20016 12

Note: Done in Brazil.

Fundão Tailings Dam Review Panel

Germano SlimesSensitivity vs. Depth

C.C6-2FIG. No.

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PROJECT

0

5

10

15

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25

30

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Dept

h (m

)

Sensitivity

Slimes (2016 Data) Slimes (Historical Data)

FIG. No.

Note: Done in Brazil.

Fundão Tailings Dam Review Panel

Germano SlimesCalibration of CPT Soundings with Nilcon Field Vane

C.C6-3

Notes:1. CPT values are averaged over the height of field vane.2. Nkt = 20 was adopted for purposes of this study.

FIG. No.

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PROJECT

0

10

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0 10 20 30 40 50 60 70 80 90 100

s u Fi

eld

Vane

(kPa

)

su CPT (kPa)

Nkt = 20

Slimes (2016 Data) Slimes (Historical Data)

Fundão Tailings Dam Review Panel

Germano Pit DamSand - Northeast

Particle Size Distribution

C.C6-4FIG. No.

TITLE

PROJECT

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0.0010.010.11101001000

Perc

ent F

iner

by

Wei

ght

SIEVE OPENINGS IN INCHES U.S. SIEVE NUMBERSl

COBBLESGRAVEL SAND

CLA

Y

coarse fine coarse finemediumSILT

8 6 3 1.5 3/4 3/8 4 10 20 40 60 100 20016 12

Note: Done in Brazil.

Grain Size (mm)

Fundão Tailings Dam Review Panel

Germano Pit DamSand - Southwest

Particle Size Distribution

C.C6-5FIG. No.

TITLE

PROJECT

0

10

20

30

40

50

60

70

80

90

100

0.0010.010.11101001000

Perc

ent F

iner

by

Wei

ght (

%)

Grain Size (mm)

SIEVE OPENINGS IN INCHES U.S. SIEVE NUMBERSl

COBBLESGRAVEL SAND

CLA

Y

coarse fine coarse finemediumSILT

8 6 3 1.5 3/4 3/8 4 10 20 40 60 100 20016 12

Note: Done in Brazil.