Main commodities | Cu |
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Other commodities | Au; Cu; Zn |
Ore minerals | chalcopyrite; pyrite; pyrrhotite; sphalerite |
Gangue minerals | clay shear gouge |
Quadrangle map, 1:250,000-scale | SR |
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Quadrangle map, 1:63,360-scale | D-2 |
Latitude | 60.867 |
Longitude | -147.4248 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | The occurrence is located on southeastern Fairmount Island in the S1/2 section 13, T. 9 N., R. 11 E., of the Seward Meridian. This is location 194 of Tysdal (1978) and location S-113 of Jansons and others (1984). This location is accurate to within half a mile. |
Geologic descriptionThe country rock in the area of this occurrence is sedimentary strata of the Tertiary Orca Group (Cobb and Tysdal, 1980). The occurrence is in graywacke and consists of a 2-foot-wide clay-rich shear zone containing a lens of massive chalcopyrite, pyrite, pyrrhotite, and sphalerite (Jansons and others, 1984). The U.S. Bureau of Mines sampled this occurrence and collected a chip sample that contained 1.7 percent zinc, 0.1 percent copper, and 1.59 ppm gold (Jansons and others, 1984). | |
Geologic map unit | (-147.42686120322, 60.866469062502) |
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Mineral deposit model | Besshi massive sulfide (Cox and Singer, 1986; model 24b) |
Mineral deposit model number | 24b |
Age of mineralization | Tertiary or younger; the deposit is in graywacke of the Tertiary Orca Group. |
Workings or exploration | The U.S. Bureau of Mines sampled this occurrence; a chip sample contained 1.7 percent zinc, 0.1 percent copper, and 1.59 ppm gold (Jansons and others, 1984). |
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Indication of production | None |
MRDS Number | A010356 |
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References | |
Reporters | Jeff A. Huber (Anchorage) |
Last report date | 1/31/2000 |