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Improvements in Heap Leaching to Recover Silver and Gold from Low- grade Resources.

Authors
McClelland-GE; Eisele-JA
Source
MISSING :26 pages
Link
NIOSHTIC No.
10006329
Abstract
As part of its mission to assure an adequate domestic supply of metals, essential to the nation's welfare, the U.S. Department of the interior, Bureau of Mines, investigated a particle agglomeration technique as a means for improving the flow of leaching solution through heaps of clayey or finely crushed, low-grade, gold-silver ores. Bench- and pilot-scale experiments showed that the percolation rate of cyanide leaching solution was markedly enhanced by mixing the ore with a portland cement binder, moistening the mixture, and mechanically agglomerating and aging the feed prior to heap building and leaching. The rate of gold and silver recovery markedly increased because of the increased, uniform percolation of leaching solution through the agglomerated feed. The use of concentrated cyanide solution instead of water during the aggolomeration procedure decreased the leaching time required to obtain maximum recovery. Results of bench- and pilot-scale experiments are discussed.
Publication Date
19820101
Document Type
IH; Report of Investigations
Fiscal Year
1982
Identifying No.
RI 8612
NIOSH Division
RERC;
Source Name
MISSING
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division