Table 2 Means values of the modal mineralogy of the deposits 1 (**N = 130), 2 (N = 207), 3 (N = 400), 4 (N = 229) and 5 (N = 193).

Quartz

SiO₂

36.65

31.57

37.83

55.8

15.6

Feldspar group

 Albite

NaAlSi₃O₈

2.81

5.33

7.56

0.37

1.5

 Anorthite

CaAl₂Si₂O₈

0.010

–

0.030

0.010

0.053

 K-feldspar

KAlSi₃O₈

1.22

0.120

0.730

0.390

–

Phyllosilicates

 Muscovite group

KAl₃Si₃O₁₀(OH)_1.9F_0.1

27.0

9.08

32.7

112.0

17.1

Oxides

 Fe oxide/hydroxide

Fe₂O₃/FeOOH

8.95

–

9.06

8.86

56.8

 Rutile

TiO₂

0.560

0.190

0.600

0.490

0.599

Carbonates

 Ankerite

Ca(Fe,Mg,Mn)(CO₃)O₂

0.850

16.8

1.49

11.2

1.00

 Siderite

FeCO₃

8.94

2.92

0.010

7.25

–

 Calcite

CaCO₃

–

0.020

0.230

2.25

0.200

Sulfates

 Gypsum

CaSO₄ 2H₂O

–

–

–

0.030

7.00

Sulfides

 Pyrite

Fe²⁺S₂

0.220

0.310

0.060

0.500

0.002

 Pyrrhotite

Fe^2+0.95S

4.70

0.060

0.148

0.790

0.004

 Arsenopyrite

Fe³⁺AsS

1.71

0.520

0.022

0.240

0.056

 Chalcopyrite

CaMg(CO₃)₂

0.210

0.010

–

–

–

 Gersdorffite

NiAsS

–

0.020

–

–

0.010

 Covellite

CuS

0.010

–

–

0.070

0.100

 Sphalerite

ZnS

–

–

–

0.010

–

Au minerals*

 Native Au

Au > 80%, Ag, Cu, Hg

60

45

2

364

526

 Electrum

Au = 80%, Ag = 20%

5

8

1

10

42