Sample ID

Concentration of Fe2O3 in original samples (%)

Concentration of Fe2O3 in leached samples (ppm)

Certified sample (MA-1a)

5.34

0.50

S1 (carbonate)

9.00

0.80

S3 (carbonate)

8.50

0.65

Pyrite (sulphide)

90.8

10.0

Serpentine (silicate)

5.50

1.00