Page 99 - Geochemical Remote Sensing of The Sub-Surface

76 O.F. Putikov and B. Wen
/

/i" 1 /
:
, /:
'5 /
: /./

5

0 -1 -2
cp, V
Fig. 2-51. Cathodic logging polarograms, Karelian isthmus, Russia, with depth investigation in
metres: 1- 100; 2- 160; 3- 240; 4- 260; 5- 300; 6- 320; 7- 340; 8- 360 (reproduced with permission
from Putikov, 1993).

I ~ 850m

lli m MnZ+ 30C~200
m

0 .............................................................

-0.5 -lt.0 .... I , ,,
-1.5
0
q),V
Fig. 2-52. Cathodic logging polarograms in Pechenga ore field, Kola peninsula, Russia, with lines
(arrowed) showing electrochemical reaction potentials for the corresponding ions (reproduced
with permission from Putikov, 1993).

DCDL mode, it is possible to locate the anomalous concentrations of Fe 2§ and Mn 2+. But
only at low dissolved oxygen concentrations (as a rule, at depths of more than 300 m) is
it possible to determine Zn z+, Ni 2+ and other heavy metals (Figs. 2-51, 2-52, 2-53). Use
of the more sensitive PPL mode increases the effectiveness of hydrochemical
prospecting for deep-seated ore deposits.
Laboratory experiments and practical field experience have demonstrated the use of
PL in underground leaching of uranium ores. The method has been shown to be effective
for all phases of a mining operation, i.e., preparation of a section for exploitation,
exploitation itself and subsequent remediation. The main components that need to be
determined during preparation for exploitation of a mineral deposit are O2, Fe 2§ C1- and