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Leaching Gold-Bearing Mill Tailings from Mercur, Utah.

Authors
Nichols-IL; Peterson-L
Source
NTIS: PB 192 300 :10 pages
Link
NIOSHTIC No.
10009038
Abstract
Tailings dumps at mercur, Utah, contain about $7 million worth of gold in 3.5 million tons of mill tailings assaying about 0.07 Ounce of gold per ton. Commercial mining and milling at mercur ceased in 1942. To determine whether improved technology was now available that might permit economic reprocessing of the mercur dumps, the Bureau of Mines probed for a low-cost method that would be applicable to these tailings. A composite prepared for laboratory studies assayed 0.062 Ounce gold per ton. About 10 percent of the gold occurred as a water-soluble cyanide. Conventional cyanide leaching dissolved 32 percent of the gold, and hot, strong cyanide solution dissolved 42 percent. Results were not improved by pretreatment with acids, bases, or oxidants. After expensive preroasting, gold recovery by cyanidation was increased to 65 percent. The simple procedures were ineffective, and more effective procedures were too costly for economical processing of mercur tailings.
Publication Date
19700101
Document Type
IH; Report of Investigation;
Fiscal Year
1970
NTIS Accession No.
PB-192300
NTIS Price
A02
Identifying No.
RI 7395
NIOSH Division
SLRC;
Source Name
NTIS: PB 192 300
State
UT;
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