Justification of application field and technological parameters of selective heap gold leaching in open pit mining of complex-structure deposits

The article presents the theoretical and experimental research connected with actual problem of geotechnology, namely, processing of low-grade copper–porphyry ore containing disperse gold. The process flow diagram is substantiated for stage-by-stage heap leaching of gold and copper from low-grade oxidation ore of the Malmyzh copper–porphyry deposit. The experimental results of advance activation leaching of gold from coarse ore and from postcrushing slimy fraction using chloride–hypochlorite solutions are given to prove profitable gold recoverability. Gold leaching is followed by copper leaching using sulfuric acid–peroxide and cycling sulfuric acid solutions. Cycling sulfuric acid solutions are enriched with sulfates from oxidation of sulfur of accessory sulfide minerals in additional layer of primary ore placed in the main pile, and with a natural oxidizer represented by ferric iron resulted from additional oxidation of iron in oxide, hydroxide and residual sulfide minerals. The use of the proposed process flow diagram ensures profitable recovery of gold (93–94%) and additional extraction of copper (to 50%) without capital inputs and at minimum operating expenses.

Keywords: standard-quality and low-grade ore, mining advance, heap leaching parameters, oxidation zone, activation solutions, stage-by-stage heap leaching, disperse gold, copper leaching, oxidation preparation, sulfuric acid–peroxide solutions, chloride–hypochlorite leaching.
For citation:

Rasskazov I. Yu., Sekisov A. G., Rasskazova A. V., Sobolev A.A. Justification of application field and technological parameters of selective heap gold leaching in open pit mining of complex-structure deposits. MIAB. Mining Inf. Anal. Bull. 2020;(10):106-114. [In Russ]. DOI: 10.25018/0236-1493-2020-10-0-106-114.

Acknowledgements:
Issue number: 10
Year: 2020
Page number: 106-114
ISBN: 0236-1493
UDK: 622.775
DOI: 10.25018/0236-1493-2020-10-0-106-114
Article receipt date: 10.06.2020
Date of review receipt: 11.08.2020
Date of the editorial board′s decision on the article′s publishing: 20.09.2020
About authors:

I.Yu. Rasskazov1, member of Russian Academy of Sciences, Dr. Sci. (Eng.), Scientific Adviser, e-mail: rasskazov@igd.khv.ru,
A.G. Sekisov1, Dr. Sci. (Eng.), Acting Director,
A.V. Rasskazova1, Cand. Sci. (Eng.), Leading Researcher,
A.A. Sobolev1, Cand. Sci. (Eng.), Senior Researcher,
1 Mining Institute, Far Eastern Branch of Russian Academy of Sciences, 680000, Khabarovsk, Russia.

 

For contacts:

I.Yu. Rasskazov, e-mail: rasskazov@igd.khv.ru.

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