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Unnamed

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au
Other commodities Mo; Zn

Geographic location

Quadrangle map, 1:250,000-scale CB
Quadrangle map, 1:63,360-scale A-1
Latitude 55.0833
Longitude -162.3333
Nearby scientific data Find additional scientific data near this location
Location and accuracy Approximate location is 2 mi (3.2 km) northwest of northwest shore of King Cove Lagoon. Anomaly no. 73 of Christie (1974) and no. 5 of MacKevett and Holloway (1977, p. 9).

Geologic setting

Geologic description

3,000 by 6,000 ft (900 by 1,800 m) color anomaly due to weathering of disseminated pyrite in dacite and quartz diorite. In the dacite, pyrite occurs in small cavities along with clots of epidote and chlorite. The quartz diorite also contains about 1 percent pyrite in fractures. Numerous thin breccia zones cross-cut the quartz diorite, and contain highly leached and altered fragments in a black, finely ground pyritiferous matrix. One 4' (10 cm) thick barren quartz vein was noted.
Geologic map unit (-162.335313305102, 55.0824294822838)
Mineral deposit model Epithermal gold vein
Mineral deposit model number 25
Age of mineralization Pliocene or younger
Alteration of deposit Propylitic alteration, as evidenced by presence of epidote and chlorite; also silicification.

Production and reserves

Workings or exploration Brief reconnaissance geologic mapping and sampling reported by Christie (1974). One sample of the pyritiferous matrix of a breccia zone yielded 0.03 ppm gold and 2.7 ppm silver. Other samples from the color anomaly yielded up to 3.8 ppm silver, molybdenum to 15 ppm, and zinc to 127 ppm.
Indication of production None

Additional comments

Good candidate for further evaluation as an epithermal gold vein system, rather than as a copper porphyry as was done by Christie (1974).

References

MRDS Number A106058

References

Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
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.
Reporters G.D. DuBois, F.H. Wilson
Last report date 5/13/1994