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Peak 2710

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Zn
Other commodities Ag; Mo; Pb; Sn; Th; U
Ore minerals bornite; chalcopyrite; galena; malachite; sphalerite
Gangue minerals magnetite; manganese oxides

Geographic location

Quadrangle map, 1:250,000-scale CO
Quadrangle map, 1:63,360-scale B-1
Latitude 67.49
Longitude -141.27
Nearby scientific data Find additional scientific data near this location
Location and accuracy Located about 2 mi (3.2 km) southwest of hill 2710, midway between Rapid River and Sunaghun Creek, between two localities shown in Barker (1981, p.65 and 76); located to within 3000 ft (915 m).

Geologic setting

Geologic description

Locally high-grade lenses of Cu sulfides, sphalerite, galena and magnetite in thermally altered calcareous argillite intruded by rhyolite porphyry dikes and sills. Fe and Ma staining are abundant in contact zone. Mineralization can be traced 75 ft (23 m) in rubble. Nearby rocks include Paleozoic? black phyllite, maroon and green argillite, calc argillite, quartzite and limestone (Neruokpuk Fm.?), and are locally malachite or manganiferous stained (Barker, 1981, p. 64-68, 75-9).
Geologic map unit (-141.27270812725, 67.4897514456408)
Mineral deposit model Lode; hornfels and sulfide mineralization related to emplacement of rhyolite porphyry.

Production and reserves

Workings or exploration 'Manganiferous' granite contains <300 ppm Cu, 2.0% Zn, 1500 ppm Pb and 6 ppm Ag (Brosge and Reiser, 1968). Skarn with quartz, magnetite and sulfides contains 8.6% Cu, 8700 ppm Pb, 3800 ppm Zn, 43 ppm Ag. Gossan with malachite contains 8 ppm Mo, 767 ppm Sn, 102 ppm Be, 5500 ppm Cu, 1.1% Pb, 1.2% Zn, 84 ppm Ag and 160 ppm U. Hornfelsed argillite contains 55.6 ppm Th, 14.4 ppm U. Soils contain up to 290 ppm Cu, 4100 ppm Pb, 6400 ppm Zn, 0.9 ppm Ag (Barker, 1981, p. 78).
Indication of production None

Additional comments

See MAS/MILS Sequence number 0020330006 (USBM, 1995).

References

MRDS Number A106080

References

Barker, J.C., 1981, Mineral investigations in the Porcupine River drainage, Alaska: U.S. Bureau of Mines Open-File Report 27-81, 189 p., 2 sheets.
Barker, J.C., and Clautice, K.H., 1978, Mineral reconnaissance of the Porcupine River region--A summary report: U.S. Bureau of Mines Open-File Report 87-78, 20 p.
Grybeck, Donald, 1977, Map showing known mineral deposits of the Brooks Range, Alaska: U.S. Geological Survey Open-File Report 77-166-C, 45 p., 1 sheet, scale 1:1,000,000.
Reporters J.M. Schmidt
Last report date 10/15/1992