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Unnamed (near terminus of glacier at head of West Fork Chistochina River)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au; Pb
Ore minerals chalcopyrite; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.1733
Longitude -144.9974
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is southeast of the terminal moraine of the glacier at the head of the West Fork Chistochina River and at an elevation of about 3,950 feet. It is in the NE1/4NE1/4 section 23, T. 20 S., R. 14 E., Fairbanks Meridian. The prospect corresponds to locality 8 on figure 1 of Rose (1967) and locality 1 on figure 6 of Cobb (1979 [OFR 79-238]).

Geologic setting

Geologic description

At this prospect upper Paleozoic volcanic rocks of the Slana Spur Formation are pyritized over a radius of about 600 feet (Rose, 1967). The volcanic strata are cut by a 1-foot-wide quartz-pyrite-chalcopyrite vein and locally stained with malachite. A selected sample of a sulfide-rich part of the vein assayed 0.02 ounce of gold per ton, 0.46 ounce of silver per ton, and 2.2 percent copper. Lead is present but probably at less than 500 parts per million (Rose, 1967).
Geologic map unit (-144.999620946251, 63.1728975791648)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Late Paleozoic or younger, on the basis of the age of the host rocks.

Production and reserves

Workings or exploration A quartz-pyrite-chalcopyrite vein is exposed in a small pit.
Indication of production None

References

MRDS Number A011771

References

Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p.
Rose, A.W., 1967, Geology of the upper Chistochina River area, Mount Hayes quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 28, 41 p., 2 maps, scale 1:40,000.
Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 6/27/2003