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Unnamed (southwest of head of Zachary Bay)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale B-3
Latitude 55.284
Longitude -160.707
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on Unga Island about 1.5 miles southwest of the head of Zachary Bay (Christie, 1974, color anomaly 83). The map site is at an elevation of about 1,350 feet, 0.4 mile southeast of the top of hill 2283. The locality is accurate to within 2,500 feet.

Geologic setting

Geologic description

This site represents a color anomaly 1,500 by 6,000 feet (Christie, 1974, number 83), in Tertiary diorite, dacite, and hornfels (Wilson and others, 1995). Coarse clots and disseminations of pyrite occur in the diorite and dacite. Hornfels at a diorite contact contains disseminations and fracture fillings of chalcopyrite and magnetite exposed in a 200- by 200-foot area. Samples of this rock contained up to 0.3 percent copper. Christie (1974) also reported a pyritic stockwork containing 500 ppm copper. One sample of this stockwork assayed 0.06 ppm gold.
Geologic map unit (-160.709040134028, 55.283168812083)
Mineral deposit model Porphyry Cu; Porphyry Cu-Au (Cox and Singer; 1986; models 17 and 20c)
Mineral deposit model number 17, 20c
Age of mineralization Tertiary.

Production and reserves

Workings or exploration The Aleut-Quintana-Duval joint venture examined and sampled the occurrence in 1974 (Christie, 1974).
Indication of production None

Additional comments

This site is located on land patented by, or interim-conveyed to, the Aleut Corporation.

References

MRDS Number 10308124

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Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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.)
Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 sheet, scale 1:250,000.
Reporters S.H. Pilcher
Last report date 2/5/2001