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Evaluation of Tin-tungsten Greisen Mineralization and Associated Granite At Sleitat Mountain, Southwestern Alaska.

Authors
Burleigh-RE
Source
NTIS: PB 91-191734 Available for Reference At Bureau Libraries :41 pages
Link
NIOSHTIC No.
10011613
Abstract
In June 1989, the U.S. Bureau of Mines undertook a 9-day evaluation of the tin resource potential of the Sleitat Mountain tin deposit. Significant tin-tungsten mineralization is associated with quartz- topaz-white mica-tourmaline greisen alteration of a multiunit, 57- ma, peraluminous, granite stock which intrudes Cretaceous kuskokwim group flysch deposits. The granite comprises marginal biotite-, intermediate biotite-muscovite-, and central zinnwaldite-granite units, interpreted as a zoned alteration system. Major vein mineralization is confined to two east-west-trending zones of steeply oriented tabular lenses of greisen interleaved with mildly altered granite. Cassiterite is the dominant ore mineral while arsenopyrite, loellingite, wolframite, pyrite, sphalerite, chalcopyrite, and bismuth oxides are present in minor to trace amounts. The north and south greisen zones are estimated to contain an inferred resource of 128 to 212 million lb sn in 28.6 million st of mineralized rock. An 1,800-lb representative bulk sample contained 0.37 pct sn, 0.04 pct w, and 17 ppm ag and is considered an average grade estimate for the deposit. Drill testing by cominco Alaska exploration indicates that substantial widths of high-grade tin mineralization are included within the lower grade disseminated mineralization. Depth of deposit erosion is substantial and there exists a high probability for placer tin deposits.
Publication Date
19910101
Document Type
CP;
Fiscal Year
1991
NTIS Accession No.
PB91-191734
NTIS Price
A04
Identifying No.
OFR 35-91
NIOSH Division
AFOC;
Source Name
NTIS: PB 91-191734; Available for Reference At Bureau Libraries
State
AK;
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