East Kazakhstan State Technical University named after D. Serikbayev:

Zimanovskaya N. A., Doctoral PhD, Engineer-geologist, e-mail: Nata_Zim@mail.ru

Gavrilenko O. D., Vice-Rector on Science and International Cooperation, e-mail: ogavrilenko@inbox.ru

The objective of the paper is determining forms of fine-dispersed gold presence and peculiarities of its localization in the minerals of different ore types. Ore samples from Bakyrchik and Ridder-Sokolnoе deposits are being examined. The examination has been done with scanning, transmission microscopy and ICPMS. Invisible Au occurrences are closely linked to As distribution. The gold in the examined ore types is in arsenopyrite and arsenious pyrite. The electronic analysis well shows it. The gold in minerals is located to the grains edge or to their boundary. The presence and dimension of gold in pyrite-complex Ridder-Sokolnoе deposit and gold deposit Bakyrchik is not identical. Major part of gold from Bakyrchik deposit is super dispersed. This gives stiff properties to the ores and makes gold extraction more difficult.

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