Main commodities | Cu |
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Other commodities | Au |
Ore minerals | chalcopyrite; pyrrhotite |
Gangue minerals | chlorite; epidote; garnet |
Quadrangle map, 1:250,000-scale | MH |
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Quadrangle map, 1:63,360-scale | B-4 |
Latitude | 63.2783 |
Longitude | -145.8714 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | The approximate location of this prospect is at an elevation of 3,300 feet on the northwest flank of Rainy Mountain. It in the SE1/4SW1/4 section 8, T. 19 S., R. 10 E., Fairbanks Meridian. The location is within a mile of Cobb's locality 8 (1979 [OFR-79-238]) and locality S80 in table 2 of Nokleberg and others (1991). Martin (1920) described copper deposits 7 miles from Millers Roadhouse, and the Copter lode claims are also in the area (Brooks, 1918; Mulligan, 1974). No evidence of surface workings or mineralization was found at these claims in 1993 (W.T. Ellis, oral communication, 1996). |
Geologic descriptionChalcopyrite- and pyrrhotite-bearing diorite and altered limestone (skarn) reportedly were collect in this area by A.H. McNeer (Brooks, 1918). The Copter lode prospect consists of sparse chalcopyrite and pyrrhotite and minor gold in garnet-epidote-chlorite skarn hosted in limestone of the Eagle Creek Formation of Pennsylvanian age and in adjacent Triassic gabbro (Nokleberg and others, 1991). | |
Geologic map unit | (-145.873653587087, 63.2778826503655) |
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Mineral deposit model | Cu skarn (Cox and Singer, 1986; model 18b). |
Mineral deposit model number | 18b |
Age of mineralization | Late Paleozoic or Triassic. |
Alteration of deposit | A specimen from the prospect was an altered limestone skarn made up of garnet, epidote, and chlorite and disseminated sulfides. |
Workings or exploration |
Surface workings with 'considerable crosscutting' were reported by Martin (1920). The occurrence is on active claims of MAN Resources. |
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Indication of production | None |
MRDS Number | A011790 |
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References | |
Reporters | W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS) |
Last report date | 6/7/2002 |