Goldstrike is Barricks largest and most productive mining operation, with gold production of more than 40 million ounces since 1987 It is located on the Carlin Trend, approximately 40 km northwest of Elko, Nevada, USA.
Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.
uranium and gold, and the main techniques employed are heap, dump and in situ leaching. Tank leaching is practised for the treatment of refractory gold ores. Bioleaching has also some potential for metal recovery and detoxification of industrial waste products, sewage sludge and soil contaminated with heavy metals.
This literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold, the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold, as well as the production, oxidation, and stabilization of thiosulfate. The leaching results of different types of gold ores including oxide, sulfide
A Comparison of Cyanide and Thiosulfate Leaching for the Recovery of Gold from a Copper Containing Ore Dai, X. / Chu, C. K. / Jeffrey, M. /er, P. / TMS2003 print version
Within the tanks, the slurry interacts with thiosulfate and a fine, beadlike material called resin that collects the gold. At full capacity, 13,400 tons of ore can be processed daily, with leaching taking place simultaneously in two sets of seven tanks.
Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign.
Of all the noncyanide gold extraction processes, thiosulfate leaching is the most suitable for industrial production because of its many advantages, such as environmental friendliness, a fast
Thiosulfate leaching can be considered a nontoxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leachingplex and carbonaceoustype ores. In addition, thiosulfate can be cheaper than cyanide.
recovery of leachable gold, taking into account the economics of longer leach residency time vs. diminishing gold recovery returns. This KPI in particular has been met with resounding successthe thiosulphate leaching solution led to an . 85 gold recovery rate. Note This project was initiated using vat leaching tanks in the process.