Quadrangle map, 1:250,000-scale | MG |
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Quadrangle map, 1:63,360-scale | B-2 |
Latitude | 62.413 |
Longitude | -153.868 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This unnamed occurrence is located in a steep canyon of the west fork of Sheep Creek, on its east bank, at an elevation of 2,450 feet (746 m) in the SW1/4 sec. 23, T. 27 N., R. 25 W., of the Seward Meridian. The reporter visited the site in 1998 at station no. 98BT448. |
Geologic descriptionThis occurrence is a highly sulfidized, alteration zone in a rhyodacite unit of the Paleocene to Eocene, Sheep Creek Volcanic Field (Bundtzen, Harris, and Gilbert, 1997). A very distinct, ferricrete gossan occurs in a cliff wall on the east side of Sheep Creek; the incompetent, mineralized walls have partially caved into the creek channel. The mineralization consists of disseminated to massive pyrite-quartz veins and stockworks up to 2 meters in width. Strike lengths were not determined. The mineralized area averages about 25 percent pyrite. Grab samples of massive pyrite-quartz veins contained an average 15.5 percent iron, 255 ppm copper, and 0.45 ppm silver (T.K. Bundtzen and G.M. Laird, written communication, 1998). | |
Geologic map unit | (-153.870223454612, 62.4123883088346) |
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Mineral deposit model | Polymetallic veins (Cox and Singer, 1986; model 22c). |
Mineral deposit model number | 22c |
Age of mineralization | Mineralization is undated. |
Alteration of deposit | Strong silicification and sericite zones. |
Workings or exploration | The reporter investigated the site in 1981. Grab samples that contained massive pyrite-quartz stockwork veins yielded an average 255 ppm copper, 15.5 percent iron, and 0.45 ppm silver (T.K. Bundtzen and G.M. Laird, written communication, 1998). |
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Indication of production | None |
Reserve estimates | None. |
MRDS Number | 10307854 |
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References | |
Reporters | T.K. Bundtzen (Pacific Rim Geological Consulting) |
Last report date | 12/4/1998 |