Modeling the cyanide heap leaching of cupriferous gold ores

Leaching of gold ores with high cyanicides: a physico-chemical modeling approach

Processing of gold ores with high sulfide minerals is problematic as they consume cyanide and reduce gold leaching. Optimization of gold leaching and cyanide consumption requires a methodology to estimate the amount of exposed cyanicides, their leaching kinetics, and speciation of cyanide complexes that consume the free cyanide and compete with gold. In this paper, a physico-chemical approach i...

Intensification Behavior of Mercury Ions on Gold Cyanide Leaching

Cyanidation is the main method used to extract gold from gold raw materials; however, a serious problem with this method is the low leaching rate. In order to improve gold leaching, the intensification behavior of mercury ions on gold cyanide leaching, for two types of materials, sulphide gold concentrate and oxide gold ore, was investigated. The results showed that mercury ions, with only a 10...

Case Study: Bacterial Cyanide Detoxification during Closure of the Green Springs Gold Heap Leach Operation

The U.S. Bureau of Mines, U . S . Department of the Interior, demonstrated the viability of using bacterial cyanide oxidation for decommissioning a heap leach operation. The field demonstration was conducted under a CRADA with USMX during the decommissioning of USMX's Green Springs gold operation near Ely, NV. The test objective was to bacterially oxidize the cyanide in the process solution usi...

A Combined Chemical and Biological Heap Leaching of an Oxide Gold-bearing Ore

Stability Analysis and Stabilization of Miduk Heap Leaching Structure, Iran

To construct copper heap leaching structures, a stepped heap of ore is placed over an isolated sloping surface and then washed with sulphuric acid. The isolated bed of such a heap consists of some natural and geosynthetic layers. Shear strength parameters between these layers are low, so they form the possible sliding surfaces of the heaps. Economic and environmental considerations call for stu...