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Tin and silver recovery from Coal Creek, AK.

Authors
Johnson-JL; Parker-T
Source
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9356, 1991 Jan; :1-21
Link
NIOSHTIC No.
10009152
Abstract
The U.S. Bureau of Mines investigated the recovery of tin and silver from the Coal Creek deposit in the Talkeetna Mountains, Alaska. Approximately 5 million st of reserves grading 0.2 pct Sn with silver credits of 0.2 Tr oz/st have been delineated by drilling. A 10- to 25-pct-Sn gravity concentrate was produced by treating the minus 20-mesh ore with a spiral, then regrinding to minus 65 mesh and tabling. Sulfide contamination in the gravity concentrate was as high as 60 pct. Sulfide flotation of this concentrate produced tailings containing 40 to 50 pct Sn. Overall recovery was 76 pct for tin but only 5 to 10 pct for silver because of losses during sulfide flotation. Other methods tested to clean the concentrate included cassiterite flotation, gangue flotation, nitric acid leaching, and wet and dry magnetic separation. Tin beneficiation tests on the minus 325-mesh fraction included cassiterite flotation, vanning, sulfide flotation, and fuming. The bench-scale and locked- cycle tests were used to estimate the mass flows for a 1,000-st/d plant.
Keywords
Flotation; Coal-mining; Leaching; Extraction; Separation; Coal-preparation; Talkeetna-Mountains; Alaska; Materials-recovery; Tin; Silver; Coal-deposits; Beneficiation
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
PB91-230326
NTIS Price
A03
Identifying No.
RI-9356
NIOSH Division
SLRC
Source Name
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9356
State
AK; UT
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