Main commodities | Ag; Cu |
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Other commodities | Zn |
Ore minerals | chalcopyrite; pyrrhotite; sphalerite |
Quadrangle map, 1:250,000-scale | MG |
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Quadrangle map, 1:63,360-scale | A-2 |
Latitude | 62.01 |
Longitude | -153.88 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | The West Fork-Post River occurrence is located on an east facing bluff of the west fork of Post River; it is at an elevation of approximately 4,000 feet (1,220 m) in the NE1/4 sec. 8, T. 22 N., R. 25 W., of the Seward Meridian. The occurrence, which corresponds to locality number 19 in Cobb (1972), is located to within 460 m. |
Geologic descriptionThe West Fork-Post River occurrence consists of small lenses and disseminations of pyrrhotite associated with a swarm of northwest-trending mafic dikes that cut argillite of the Early to Late Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen and others, 1988; Bundtzen, Harris, and Gilbert, 1997). Samples collected by Reed and Elliott (1968, C 596) contained semi-massive pyrrhotite and minor chalcopyrite and sphalerite. Values from selected grab samples on the surface run up to 45.7 grams/tonne silver, 1.50 percent copper, and 0.07 percent zinc. | |
Geologic map unit | (-153.882230476209, 62.0093690663369) |
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Mineral deposit model | Polymetallic vein (Cox and Singer, 1986; model 22c). |
Mineral deposit model number | 22c |
Workings or exploration | The West Fork-Post River was discovered by the late Bruce Reed during mineral investigations for the U.S. Geological Survey in the 1960s (Reed and Elliott, 1968, C 596). Values from selected grab samples collected by Reed and Elliott (1968, C 596) contain up to 45.7 grams/tonne silver, 1.50 percent copper, and 0.07 percent zinc. |
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Indication of production | None |
Reserve estimates | None. |
Additional commentsSimilar to Veleska-South prospect (MG050) in McGrath B-2 quadrangle. |
MRDS Number | A015041 |
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References | |
Reporters | T.K. Bundtzen (Pacific Rim Geological Consulting) |
Last report date | 10/30/1998 |