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Unnamed (northeast of Slate Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; malachite; secondary copper minerals
Gangue minerals epidote

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.1804
Longitude -144.8319
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is south of the terminus of the Chistochina Glacier at an elevation of about 4,600 feet. It is about 1.1 miles northeast of the mouth of Slate Creek and about one-half mile southwest of informally named Big Four Creek, in the NW1/4SW1/4 of sec. 14, T. 20 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 23 of Rose (1967), locality 13 on figure 6 of Cobb (1979 [OFR 79-238]), and locality 135 of Nokleberg and others (1991). The location is probably accurate within 0.2 mile.

Geologic setting

Geologic description

This occurrence is in a body of gabbro and mafic gabbro that is about a mile wide and possibly elongated to the northeast (Rose, 1967). The gabbro is probably Late Triassic in age. The mafic intrusive is overlain unconformably by the 'round wash' conglomerate of Tertiary age. The same gabbro body forms the bedrock in the Big Four Creek placer deposit (MH293). Chalcopyrite and secondary copper minerals, probably including malachite, occur in a vein or in a vuggy epidote-filled segregation in gabbro.
Geologic map unit (-144.834129069564, 63.1800043588989)
Age of mineralization Late Triassic or younger, on the basis of the age of the host rock.
Alteration of deposit Alteration consists of epidote-filled veining or segregations in gabbro.

Production and reserves

Workings or exploration No workings are reported.
Indication of production None

References

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.
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
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 7/2/2003