Page 88 - Geochemical Remote Sensing of The Sub-Surface

Geoelectrochemistry and stream dispersion 65

I,A q),V mineral
, -0,44 ,Pyrite
-0,58 Chaleopyrite
-0,78 Galena
15 -1,20 Sphalerite

1o

5

o
0,5 1.0 %

1[ xr-z'] 2["~ 3 ~ 4[~ 5["#~ 6['V'] 7~
Fig. 2-43. The CPC polarisation curves of a zoned polymetallic ore body at Rudny Altay, Russia,
with current electrode in borehole 2012: 1- unconsolidated overburden; 2- acidic tuffites; 3-
sericite-quartz slates; 4- dacitic porphyrites; 5- limonitisation; 6- polymetallic ore; 7- pyrite ore.

where, So' is the total physical surface of the ore body as an electronic conductor.
Comparison of expressions (2.41) and (2.42) gives,

1 [ lira i
S~ '- J li~ 9 C (2.43)

But it is difficult to use equation (2.43) in practice because of difficulty in
determining values of So' and j~m. TO avoid this difficulty, Ryss suggested the analogue
empirical correlation,

limi
S~176176 C~ (2.44)

where So is the square of the conventional (geological) surface which bounds the
calculated mineral reserves of an ore body, and kl0o is an empirical coefficient (the
transient coefficient). If the conventional surface So coincides with the physical surface
So', from equations (2.43) and (2.44) we obtain,