Supergene sulfide ores rich in native copper minerals are refractory to treatment with sulfuric acid leaching on all practicable time scales, and the dense metal particles do not react with froth flotation media.
12.
The mine output was 970, 000 tonnes of 0.09-0.13 % ore and the ore concentrate produced a mix of about 150, 000 tonnes of yellowcake which was then processed at Port Pirie where it was subjected to hot acid leaching, producing about 860 tons of U 3 O 8 worth more than ?15 million.
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