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Main characteristics of American gold heap leaching producti

2020-06-29 15:03

Introduction:In 1971, Carlin Gold Mining Co., an American gold mining company, used heap leaching for the first time to processthe low grade oxidized ore of Cortez gold deposit, which brought about a great change in gold production technology in 70s. S

 In 1971, Carlin Gold Mining Co., an American gold mining company, used heap leaching for the first time to process the low grade oxidized ore of Cortez gold deposit, which brought about a great change in gold production technology in 70s. Subsequently, Nevada was the center of the United States. Dozens of heap leaching sites have been established in many areas, and the heap leaching technology has developed rapidly. In 1980, the United States applied granulation technology to heap leaching industrial production on the basis of small-scale and semi-industrial tests. The application of heap leaching gold extraction technology to many gold producing countries in the world has greatly promoted the development of gold production in the world.
Main characteristics of American gold heap leaching production is:
1、Low head grade  The head grade of heap leaching is generally 0.55 ~ 3g/t, and the boundary grade is 0.3g/t.. According to the statistics of 10 large heap leaching mines built in the past 1986~1988 years, the average grade of ore is 1.78g/t.
2、Large scale  The annual ore treatment capacity of heap leaching mines ranges from several hundred thousand tons to several million tons. The amount of single heap ore can reach more than one million tons at most. The largest heap leaching mines have an annual output of gold 10 tons. Large scale of heap leaching can reduce head grade and processing cost as much as possible.
3、Mechanization and automation  Heap leaching mining from geological exploration, mining, crushing, transportation, stacking, spray, carbon adsorption, desorption and electrolysis to the process of each procedure, have all realized mechanization. Such as geological exploration has been widely used in mobile type reverse circulation rotary percussion drilling, the drilling efficiency is increased. The United States has the design and manufacture of large mobile transport special cloth machine heap. Granulating equipment, spray equipment, carbon adsorption high pressure desorption electrolytic equipment has large scale, standardization and seriation.
    Electronic technology has been applied to engineering design, trial and test, project management, etc., which ensures the monitoring and prediction of heap leaching process and strengthens the modern management of heap leaching mine.
4、Scientific The construction of heap leaching mines strictly follows the scientific procedures of small scale tests (roll bottle test), column leaching test, semi-industrial production trial, etc.. In order to avoid failure, special attention is paid to feasibility studies; according to the nature of the ore, reserves, Grade and construction funds to select the best economic benefits of the project.





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