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South Currant Creek

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Zn
Other commodities Au
Ore minerals chalcopyrite; gold
Gangue minerals biotite; chlorite; hornblende; magnetite; pyrite; quartz

Geographic location

Quadrangle map, 1:250,000-scale LC
Quadrangle map, 1:63,360-scale A-2
Latitude 60.24
Longitude -153.68
Nearby scientific data Find additional scientific data near this location
Location and accuracy Locality on a slope about 1,200 m north of South Currant Creek, west of Chigmit Mountains. This is locality 27 of Nelson and others (1985) and locality 29 of MacKevett and Holloway (1977). Sec. 30, T. 2 N., R. 25 W., of the Seward Meridian. Location is accurate to within 2.4 km.

Geologic setting

Geologic description

Limestone and diorite float boulders contain disseminated pyrite, magnetite, and chalcopyrite. Limestone has been slightly altered to skarn, calc-silicate veins cut diorite and granodiorite. Stream sediment samples yielded up to 220 ppm Cu, 500 ppm Zn, 0.4 ppm Au (Resource Associates of Alaska, 1976). The locality is in the vicinity of a contact between Tertiary medium-grained biotite-hornblende granodiorite unit (with some granite and quartz monzodiorite) and a Cretaceous granodiorite unit which ranges in composition from mafic tonalite to quartz diorite (Nelson and others, 1983; units Ti11 and Ki9).
Geologic map unit (-153.682206426218, 60.2393465243287)
Mineral deposit model Cu skarn (Cox and Singer, 1986; model 18b)
Mineral deposit model number 18b
Age of mineralization Intrusives associated with the skarn are Cretaceous to Tertiary.
Alteration of deposit Limestone partially altered to skarn, chlorite alteration in diorite.

Production and reserves

Workings or exploration Stream sediment samples yielded up to 220 ppm Cu, 500 ppm Zn, 0.4 ppm Au (Resource Associates of Alaska, 1976).
Indication of production None
Reserve estimates No reserves
Production notes No production

Additional comments

Site is in Lake Clark National Park and Preserve.

References

MRDS Number A013015

References

MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, 1 sheet, scale 1:250,000.
Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.
Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, Contract JO166108, 7 v.
Reporters M.L. Miller (USGS); D.P. Bickerstaff (USGS)
Last report date 6/15/1998