Gold and silver heap leaching began with the first Cortez heap leach in 1969. While many projects have come and gone, Cortez is still going their new 63,000 tonne/day South Area leach is scheduled to start up in 2002. The largest U.S. precious metal heap leach is the Round Mountain, Nevada, operation with
gold bearing ore with hydrogen peroxide during heap leaching of gold increases gold recovery by 1.2% and amounts to 55.89%, without treatment 54.69%. This increases the consumption of sodium cyanide by 0.04 kg/t. Keywords: heap leaching gold, heap leaching intensification, gold leaching, hydrogen peroxide, oxidizer, gold.
Type of Cyanide Heap Leaching. The industrial cyanide heap leaching method can be divided into two types, one is short term heap leaching and the other is long term heap leaching. In the short term heap leaching method, the ore is usually crushed to less than 20 mm. When processing gold bearing quartz veins, it is often crushed to less than 6 mm.
The initial redox potential was remarkably low at the beginning; however, in situ leaching of the oxidant resulted in an increase of 100 mV in the redox potential within 4 h, after which the redox behavior was very similar to test 14, Fig. 8A. Final gold extraction in pure calcium chloride solution was shown ...
The potential for technology change in the recovery of gold from cyanide heap leach solution is high. This change coud be via developments in conventional technology. In the case of the carbon in column process, improved reactor design and improved rate/selectivity of the adsorption/desorption reactions may provide for ...
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Gold Cyanidation. The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established. Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows: 4 Au + 8 NaCN + O2 + 2 H20 = 4 NaAu 2 + 4 NaOH.