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Reger Pyrrhotite

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Ni
Other commodities Fe
Ore minerals pyrrhotite
Gangue minerals limonite

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale A-3
Latitude 62.159
Longitude -154.399
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Reger Pyrrhotite occurrence is located on the west side of Straight Creek Valley about one kilometer southwest of the Chip Loy deposit (MG032)) at an elevation of 3,460 feet (1,055 m) in the NW1/4 sec. 22, T. 24 N., R. 28 W., of the Seward Meridian. Location is based on a description and map provided by Herreid (1968).

Geologic setting

Geologic description

The Reger Pyrrhotite occurrence is in a limestone-slate thermal aureole 760 meters north of the contact of the Middle Fork Plutonic complex (Solie, 1983). A steeply dipping mafic dike of Tertiary (?) age is covered by limonite and contains abundant disseminated pyrrhotite. The sulfide-bearing dike continues upward to an elevation of at least 3,750 feet (1,143 m). Azurite and malachite staining was noted. A sample collected in the mineralized area contains 230 ppm copper and 600 ppm nickel (Herreid, 1968).
Geologic map unit (-154.401237372794, 62.1583649788567)
Mineral deposit model Disseminated Ni-Cu-PGE type? (Cox and Singer, 1986; model 5b?).
Mineral deposit model number 5b?
Age of mineralization Unknown; dike rock is undated.
Alteration of deposit Copper bearing sulfides oxidized to azurite and malachite.

Production and reserves

Workings or exploration The Reger Pyrrhotite occurrence was found by R.D. Reger during field investigations by the Alaska Department of Natural Resources in 1967 (Herreid, 1968). A sample collected in the mineralized aureole contains 230 ppm copper and 600 ppm nickel.
Indication of production None
Reserve estimates None.

Additional comments

See Chip Loy deposit (MG032).

References

MRDS Number 10307845

References

Gilbert, W.G., Solie, D.N., and Kline, J.T., 1988, Geologic map of the McGrath A-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 92, 2 sheets, scale 1:63,360.
Herreid, G.H., 1968, Geological and geochemical investigations southwest of Farewell, Alaska: Alaska Division of Mines and Geology Geologic Report 26, 24 p., 1 sheet, scale 1:75,000.
Solie, D.N., 1983, The Middle Fork plutonic complex, McGrath A-3 quadrangle, southwest Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 83-16, 17 p.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting)
Last report date 11/25/1998