Wide Bay

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale UN
Quadrangle map, 1:63,360-scale C-2
Latitude 53.9167
Longitude -166.65
Nearby scientific data Find additional scientific data near this location
Location and accuracy North corner of Wide Bay, Unalaska Bay, Unalaska Island. Anomaly no. 26 of Christie (1974).

Geologic setting

Geologic description

This is a very small (100 by 200 ft, 30 by 60 m) color anomaly localized along andesite dikes that cut volcanic flows and pyroclastic rocks of the Unalaska Formation (see Drewes and others, 1961). Chalcopyrite and pyrite occurs as disseminations in narrow envelopes in wall rocks surrounding the dikes which trend 300ø (N30øE) and dip steeply south. Oxidation obscures original textures and may have obliterated evidence of primary chalcopyrite. Very minor chalcopyrite remains. Fracturing is moderately developed.
Geologic map unit (-166.651888652856, 53.9158344483226)
Age of mineralization Miocene or younger
Alteration of deposit Silicification is the only form of alteration other than oxidation described. Leaching ranges from moderate to intense.

Production and reserves

Workings or exploration Brief reconnaissance mapping and collection of one silt sample yielding background results for copper, molybdenum, zinc, silver, and gold.
Indication of production None

References

MRDS Number A106009

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Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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.)
Reporters Damon Bickerstaff, F.H. Wilson
Last report date 5/4/1994