Page 91 - Geochemical Remote Sensing of The Sub-Surface

68 O.F. Putikov and B. Wen

mineral tg,V ,V mineral
Chalcopyrite +0.17 -0.32 Pentlandite
Pentlandite +0.4 -0.5 Chalcoowite
-0.5 P~hotite
-1.14 Penflandite
I, A

n~t,A .0

1.0 0 -1.0 ~o,V

Fig. 2-44. The CPC polarisation curves of a copper-nickel sulphide ore body, Kola peninsula,
Russia (reproduced with permission from Ryss, 1973).

the cathodic reactions and with k~oo = 100 m2/A for the anodic reactions for calculation
of the total ore body surface So and the masses of pentlandite, Mpnt, chalcopyrite, Moo,
and the combined mass of pentlandite, chalcopyrite and pyrrhotite, My. The results of
the calculation are Mpnt = 1.3 x 106 kg, Mcp = 0.65 x 106 kg and My = 4.5 x 106 kg. The
ore body surface values So for different electrochemical reactions are approximately
equal to the average value, S0av = 12.8 x 103 m 2.

TABLE 2-III
Interpretation of CPC polarisation curves from Kola peninsula (Ryss, 1973)

q~, V Mineral llim, A So, 103m 2

0.17 Chalcopyrite 1.8] 12.0]
5.5 ~ 12.2
0.40 Pentlandite 3.7 J 12.3J
-0.32 Pentlandite 1.01 ] 16.8 ]
2.54 ~ 12.7
-0.50 Chalcopyrite ] 1.53 J 11.0 J

-0.50 Pyrrhotite J
- 1.14 Pentlandite