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In order to characterize the petrological and chemical effects of illuviation, we collected 14 samples from an ~6.7m high tonalitic corestone (tor) and 17 samples of saprock from an adjacent ~65cm deep trench extending laterally ~1.5m. Based on thin section observations, all saprock samples are characterized by a network of transgranular and intergranular cracks filled or lined with illuviated clay...
A method has been developed to optimise the cyanide:oxygen ratio in gold CIP/CIL circuits. A gold (96%)/silver (4%) alloy disc electrode is placed in the leaching pulp and its corrosion potential measured against a reference electrode. The electrode is then rotated in the pulp to increase the diffusion rate of cyanide and/or oxygen to the electrode surface, and the electrode's corrosion potential...
Hydrogen cyanide gas (HCN (g) ) is released from CIP/CIL slurries through either entrainment in the air/oxygen injected into the tanks, or through direct evolution from the pulp surface.The HCN (g) released by entrainment has been measured by placing capped pipes over aerated/oxygenated tanks to collect the evolved gas. The collected gas was passed through a scrubber...
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