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Calcite

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; malachite; pyrite
Gangue minerals serpentine

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.545
Longitude -143.723
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at the head of MacDougal Creek. It is at an elevation of about 4,950 feet, 2,500 feet north-northwest of elevation 5975, and 1,700 feet southeast of the center of section 2, T. 4 S. R. 9 E. of the Copper River Meridian. This is locality 106 of MacKevett (1976) and locality 37 of MacKevett and others, 1978). The location is accurate to within about 100 feet. This prospect was included by Cobb and MacKevett (1980) under the name 'Calcite'.

Geologic setting

Geologic description

This prospect consists of a brecciated fault zone along the contact of altered Triassic limestone and granodiorite; the fault zone contains sparse amounts of pyrite, chalcopyrite, and malachite (Moffit and Mertie, 1923; Van Alstine and Black, 1946; MacKevett, 1976). The altered limestone is bleached and contains magnesite, dolomite, and seams of calcite. The fault zone also contains abundant serpentine minerals, and pods and veins of serpentine occur in the limestone (Van Alstine and Black, 1946; MacKevett, 1976).
Geologic map unit (-143.72508401705, 61.5445412003272)
Mineral deposit model Vein
Alteration of deposit Dolomitization(?); serpentine veining and replacement.

Production and reserves

Workings or exploration The deposit was explored by a short adit.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011724

References

Cobb, E.H., and MacKevett, E.M., Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the McCarthy quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-885, 156 p.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, 1 sheet, scale 1:63,360.
Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.
Van Alstine, R.E., and Black, R.F., 1946, Copper deposits of the Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 947-G, p. 121-141.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003