Depending on all the other variables and costs associated, some projects can be viable with a gold grade as low as 0.5 g Au per tonne of ore, with sufficient tonnages. With lower gold grades beneficiation is often used ahead of leaching to increase the grade of Au and reduce the quantity of ore to be leached.
Telluride Gold Ore Processing Solubility of Tellurides. In Bul. C.I.M, and M. June, 1933, under the heading Gold Tellurides Are Soluble in Cyanide, W. E. Johnston wrote: The gold bearing tellurides behave very much as does gold itself. Finely divided particles are dissolved fairly rapidly; coarser particles more slowly.
Gold cyanidation is a hydrometallurgical technique for extracting gold from low grade ore by converting the gold to a water soluble coordination complex. It is the most commonly used leaching process for gold extraction.
The invention relates to a method for extracting gold through potassium ferricyanide. The method is characterized in that the gold is extracted from the auriferous ores under an alkaline environment at normal temperature and pressure with nontoxic ferricyanide serving as a gold leaching agent and calcium peroxide serving as a leaching adding agent; and the method is a completely novel cyanide ...
On high grade ore the process was equally successful. Some 15,000 tons from the Brown Hill Extended mine, averaging about 4 ozs. gold per ton, and containing telluride, were treated by Mr. O. B,. Ward in 1903 for an average extraction of 95 per cent. On Hannans Star ore the average cost for bromo cyanide, extending over a period of twelve ...