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Jack Creek

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale KD
Quadrangle map, 1:63,360-scale A-4
Latitude 57.16
Longitude -153.24
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located on northwest Sitkalidak Island approximately 2 miles south of the head of Amee Bay. Site location is accurate to within 1 mile.

Geologic setting

Geologic description

This prospect consists of a shear zone containing thin seams of chalcopyrite and of several narrow veins containing chalcopyrite and pyrrhotite, all of which cut Cretaceous metasedimentary rock . The shear zone is approximately 20 feet in width. Two samples of the shear zone taken by Saunders (1952, PE 131-6, PE 131-8) assayed 1.36 percent copper over 7.5 feet and 1.26 percent copper over 6.3 feet. A narrow vein striking N. 5 E. and dipping 60 W contained 1.24 percent copper over 0.7 feet and 0.87 percent copper over 0.5 feet. Another vein striking N. 20 E. and dipping 85 W assayed 1.69 percent copper over 2.2 feet and 4.10 percent copper over 1.5 feet.
Geologic map unit (-153.242250591762, 57.1592138649196)
Mineral deposit model Copper-bearing shear zone and veinlets.
Age of mineralization Cretaceous or younger

Production and reserves

Workings or exploration A cross-cut was driven on the shear zone in 1951 or 1952. Assays of the shear range from 1.26 to 1.36 percent copper over 6.3 and 7.5 feet. Assays of the veins range from 0.87 to 4.10 percent copper over 0.5 and 1.5 feet.
Indication of production None

Additional comments

Site is located on land conveyed to the Koniag Corporation.

References

MRDS Number A106314

References

Saunders, R.H., 1952, Report on the preliminary examination of the Peninsula Exploration Co. copper claims on Sitkalidak Island, Alaska: Alaska Territorial Department of Mines Prospect Evaluation 131-6, 7 p.
Saunders, R.H., 1952, Supplement to report on preliminary examination of the Peninsula Exploration Co. copper claims on Sitkalidak Island, Alaska; Alaska Territorial Department of Mines Prospect Evaluation 131-8, p. 8-19.
Reporters S.H. Pilcher (Anchorage)
Last report date 10/13/1998