The three most commonly used processes for gold ore separation are: gravity separation flotation and cyanidation. Among them gravity separation is a commonly used process in placer gold mines flotation is mostly used in rock gold mines and cyanidation is suitable for refractory gold ores such as oxide ore and flotation concentrate.
The most common method is to roast gold-bearing minerals at temperatures of 450° to 750° C (840° to 1380° F) to destroy the interfering sulfides.
during gold ore processing. Steadily rising gold prices are also stimulating the need for gold process mineralogy due to the increasing demand for and production of the yellow metal. At SGS Lakefield Research gold process mineralogy studies are conducted routinely on all types of gold ores and mill products to assist in a wide variety
in gold ores may range from less than 1 ppm to several hundred times the level of the gold present in an ore. Generally silver is also dissolved by the cyanide solution and follows the gold through the process sequence. Iron sul- fide minerals which are common constituents of gold ores are oxidized to
The Mereur ore as well as containing Processing of refractory gold ores 1033 carbon has a significant carbonate content and this allows the process to be operated in the alkaline pH range. First Miss Gold Inc. Getchell project achieved commercial production during 1989.
The principal gold minerals that affect the processing of gold ores are native gold electrum Au-Ag tellurides aurostibite maldonite and auricupride. In addition submicroscopic (solid solution) gold principally in arsenopyrite and pyrite is also important. The main causes of refractory gold ores are submicroscopic gold the Au-Ag tellurides and very fine-grained gold (<10 µm) locked .