| Quadrangle map, 1:250,000-scale | GU |
|---|---|
| Quadrangle map, 1:63,360-scale | C-1 |
| Latitude | 62.736 |
| Longitude | -144.008 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | The Gold-Quartz prospect (Cobb, 1979 [ OF 79-1247]) is in Ahtell Creek. about one mile below the junction of Silver Creek. It is in NE1/4 section 13, T. 11 N., R. 7 E., Copper River Meridian. The location of the prospect is shown correctly as location 9 in Richter (1966). It is shown incorrectly as number 13 in Richter and Matson (1972), and is approximately located as number 12 of MacKevett and Holloway (1977). The location given here is accurate within 500 feet. |
Geologic descriptionA quartz-carbonate vein occurs in Pennsylvanian volcanic rocks that trends N5-8W and dips 67 West. It occurs between a hanging wall of serpentinized basalt or gabbro with chrysotile-calcite veinlets, and a footwall of tuff(?). Both walls of the vein are brecciated and iron stained. Slickensides and clay gouge with fragments of vein material indicate post-mineralization movement. The vein varies from 3 to 5 feet thick and is composed of locally brecciated, milky quartz with pods of ankerite; sphalerite, and smaller amounts of chalcopyrite, galena, pyrite and precious metals. Samples of vein assayed up to 0.9 ounce of gold per ton and 0.76 ounce of silver per ton, (Richter, 1964, 1966). The volcanic host rocks are part of Pennsylvanian and Permian, Slana Spur Formation. The description is summarized from Richter, 1964, 1966; Cobb, 1979 [OF 79-1247]; and Nokleberg and others, 1994. | |
| Geologic map unit | (-144.010183337134, 62.7356097475589) |
|---|---|
| Mineral deposit model | Polymetallic vein (Cox and Singer, 1986; model 22c) |
| Mineral deposit model number | 22c |
| Age of mineralization | Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton. |
| Workings or exploration | An adit driven on the vein in 1955 and 1956 encountered glacial material 55 feet from the portal. |
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| Indication of production | None |
| MRDS Number | A011843 |
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ReferencesNokleberg, W.J., and (seven) others, 1994, Metallogeny and major mineral deposits of Alaska and Metallogenic map of significant metalliferous lode deposits and placer districts of Alaska, in Plafker, G. and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, Vol.. G1, p. 855-904, Plate 11, scale 1:2,500,000.
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| Reporters | W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey) |
| Last report date | 12/4/2000 |