Mineralogical examinations of the samples including microprobe analyses of selected pyrite grains returning 0.5% to 2.1% Co supported that cobalt was present only in the pyrite lattice as cobaltiferous
Results from metallurgical studies indicate that cobalt occurs predominantly as cobaltiferous
pyrite which preferentially reports to the copper tailings.
The drilling shows that cobaltiferous
carbonates, native copper and carrolite are common at depth, but it will be a while before we get there.
Bioleaching of cobaltiferous
pyrite using mixed cultures of T.
Cobalt, however, can replace copper, calcium and perhaps also magnesium to a limited degree in such minerals as cobaltiferous
malachite and cobaltoan calcite and dolomite.
The process to be employed by the plant involves the bacterial leaching of cobaltiferous
pyrite, technology from Signet, neutralisation with limestone to remove acid and iron, removal of copper and nickel as saleable hydroxides with the purification of cobalt by solvent extraction (Krebs technology) and electrowinning.
Beck (1905), in his book on the nature of ore deposits, placed Kruisrivier in a class of its own, calling it a cobaltiferous
gold quartz vein deposit.
Although Kilembe was exclusively a copper mine, there was 1.1 Mt of by-product cobaltiferous
pyrite concentrates stockpiled at the nearby town of Kasese.