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Laboratory evaluation of some factors in cyaniding gold placers.

Authors
Nichols-IL; Salisbury-HB; Shibler-BK
Source
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 7559, 1971 Jan; :1-12
Link
NIOSHTIC No.
10008793
Abstract
The in-place cyanidation leaching of gold from placer deposits is a potential method for treating gravels too deeply buried and too low in gold content to be processed economically by conventional dredging methods. Laboratory experiments were made to evaluate those placer cyanidation factors adaptable to small-scale studies. The variables investigated included gold particle size and location in sand beds, cyanide solution flow rate, and cyanide solution strength as factors affecting gold solubility rates. The solution flow rate, in turn, was influenced by variables such as bed slope, solution head pressure, and sand size, and the effects of these factors were studied. Free gold, minus 150-mesh and finer in size, is rapidly dissolved by dilute cyanide solutions from mixtures of gold and silica and prepared to simulate placer deposits. About 94 percent of minus 325-mesh free gold was extracted in 5 hours from silica sand mixtures, and 94 percent extraction of minus 150-mesh gold was obtained in 21 hours with 0.1 percent NaCn solutions. Moving solutions were almost twice as effective in leaching free gold from silica sand mixtures than stagnant solutions.
Keywords
Mineral-deposits; Mineral-processing; Laboratory-testing; Mining-industry; Metal-mining; Cyanide-compounds
Publication Date
19710101
Document Type
IH; Report of Investigations
Fiscal Year
1971
NTIS Accession No.
PB-203668
NTIS Price
A03
Identifying No.
RI-7559
NIOSH Division
SLRC
Source Name
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 7559
State
UT
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