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Tin Occurrences Associated With the Ohio Creek Pluton, Chulitna Region, South-Central Alaska.

Authors
Warner-JD; Dahlin-DC
Source
NTIS: PB 89-148431 :29 pages
Link
NIOSHTIC No.
10006575
Abstract
In 1984 and 1985, as part of its Alaskan critical and strategic minerals project, the Bureau of Mines mapped and sampled reported tin occurrences associated with the Ohio Creek Pluton, in the central Alaska range, south-central Alaska. The pluton is a composite intrusion with a core of moderately coarse-grained biotite granite and an outer zone of finer grained leucocratic muscovite granite. Tin mineralization, associated with silver, base metal, and tungsten values, occurs within the muscovite granite as cassiterite (sNO2) within both quartz-muscovite greisen and arsenopyrite veins. Silver occurs within argentiferous galena and argentite (ag2s); tungsten is present in the mn-rich wolframite mineral huebnerite (mnwo4). Samples of arsenopyrite veins average 0.7 pct sn over 0.5 Ft, whereas samples of muscovite or quartz- muscovite greisen average 0.17 pct sn over 1.0 Ft. Metallurgical testing of three large samples of tin-mineralized greisen showed tin recoveries of 27 to 64 pct in table concentrates; respective grades of concentrates range from 39.4 to 72.1 pct sn. A low-grade (0.06 pct sn) zone near the pluton's upper contact containing numerous relatively closely spaced greisen-bordered arsenopyrite veins is inferred to contain a resource of approximately 1,250,000 lb sn.
Publication Date
19890101
Document Type
CP;
Fiscal Year
1989
NTIS Accession No.
PB89-148431
NTIS Price
A03
Identifying No.
OFR 5-89
NIOSH Division
AFOC;
Source Name
NTIS: PB 89-148431
State
AK; OH;
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