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Unnamed (south of valley of lower Butte Creek))

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; malachite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-2
Latitude 63.039
Longitude -147.63
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of approximately 3,800 feet in the mountains south of the valley of lower Butte Creek. The map site is 0.75 miles north of VABM 5896 (Way), in the NW1/4 of sec. 6, T. 22 S., R. 1 E., of the Fairbanks Meridian. The location is accurate to within 1,000 feet. This is location 41 of Clark and Cobb (1972).

Geologic setting

Geologic description

The area of this occurrence is underlain by Middle Triassic to Upper Pennsylvanian interbedded black argillite and volcanic sandstone. The upper part of sequence contains about 100 of radiolarian chert. The sequence is cut by numerous diabasic and gabbroic dikes (Wilson and others, 1998). The occurrence consists of pyrite and chalcopyrite disseminated in the bedded rocks, and of secondary malachite.
Geologic map unit (-147.632254755776, 63.0385477387469)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization The sulfide minerals probably are syngenetic with their Triassic-Upper Pennsylvanian host rocks.
Alteration of deposit Oxidation of copper minerals.

Production and reserves

Workings or exploration Surface sampling only.
Indication of production None

References

MRDS Number 10307584

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Healy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-394, 1 sheet, scale 1:250,000.
Kaufman, M.A., 1964, Geology and mineral deposits of the Denali-Maclaren River area, Alaska: Alaska Division of Mines and Minerals Geologic Report 4, 15 p., 1 sheet, scale 1:125,000.
Saunders, R.H., 1961, Susitna-MacClaren area in Williams, J.A., 1961, Report of the Division of Mines and Minerals for the year 1961: Alaska Division of Mines and Minerals Annual Report 1961, pp. 37-40.
Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 76 p., 3 sheets, scale 1:500,000.
Reporters N. Van Wyck (Stevens Exploration Management Corporation)
Last report date 4/7/2000