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The Sayak ore district is located in the north-eastern part of the Balkhash region and contains industrial molybdenum-copper and gold mineralization, which is represented mainly by skarn deposits, as well as smaller deposits and ore occurrences of hydrothermal-vein, porphyry and karst types. They are located mainly in the eastern part of the Sayak graben-syncline, which is composed of volcanic-sedimentary rocks of the Middle and Upper Paleozoic age. The Upper Paleozoic complex is accompanied by granitoid intrusion...

At present, more 900 million tons and 630 million tons of crushed tailings of copper ores are accumulated in tailings storages of Jeskasgan and Balkhash ore-processing plants, respectively. Micromineralogical studies of tails in cemented polished sections are showed the following copper minerals: chalcopyrite is the most common among them and the amount of its grains in cemented sections varies from 30 to 50 %; covellite - from 5 to 20 %; chalcocite - from rare grains to 20 %; bornite - from 4 to 25 %. Other miner...