The Technology of Opening and Mining Sites of Complex Occurrence of Placer Deposits in Permafrost Conditions

Abstract

The article presents technical solutions for the opening and development of sites of the placer deposits with upper «hanging blocks» in the conditions of the «Obryv-Razvalisty-Promezhutochnyj» placer deposit. According to the experience of the opening workings in placer deposits of the North-East of the Russian Federation, a scheme has been adopted for opening mine fields by inclined conveyor and scraper inclines using access drifts. The choice of the most rational scheme of mine field preparation in the conditions of the «Obryv-Razvalisty-Promezhutochnyj» deposit is based on many years of experience in underground mining of placer deposits in the North-East of the Russian Federation. According to the results of the analysis, a chamber-longwall method was selected. The peculiarity of the field, the presence of “upper hanging blocks” and lower blocks on the placer rock bed, determines the interposition and parameters of stopes and inter-chamber pillar.

Methodological principles of the selection of a resource-saving technology while developing water-bearing placer deposits

“…Papers [25], [26] consider the issues of secondary recovery of heavy minerals from tailing dumps of ore placer deposits; nevertheless, a problem of handling the enclosing rocks being accumulated repeatedly in the recycled tailing dumps is still unsolved. Papers [27], [28] deal with the development of technological schemes of placer deposit development; however, while analyzing, the main efficiency criterion is minimization of costs for mineral mining that does not take into consideration a problem of modern placer deposit development in terms of limited land resources.…”