Oxides (%) determined by XRF analysis^a

Al₂O₃

SiO₂

Fe₂O₃

PbO

SO₃

K₂O

MnO

As₂O₃

TiO₂

CaO

P₂O₅

MgO

Cr₂O₃

4.55

66.81

17.42

2.41

3.08

1.33

0.56

0.27

0.23

0.19

0.20

0.10

0.10

Metals (ppm) determined by Fire Assay/AAS and ICP-AES analysis

Zn

Zr

V

Cu

Mo

Ni

Rb

Tl

Zn

Sr

Ba

Au

194

27

71

280

40

82

25

25

194

75

195

4.42

Rare earth elements (ppm) determined by ICP-AES analysis

Ce

Gd

Hf

La

Nd

Pr

Sm

U

Yb

18

1.45

1.32

9.50

7.90

2.21

1.10

1.10

0.90