Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Mo
Ore minerals pyrite
Gangue minerals chlorite; epidote

Geographic location

Quadrangle map, 1:250,000-scale UN
Quadrangle map, 1:63,360-scale B-4
Latitude 53.7
Longitude -167.0333
Nearby scientific data Find additional scientific data near this location
Location and accuracy Near Cape Starichkof, Makushin Bay. Anomaly no. 2 of Christie (1974). Location accurate within approximately 1.5 km.

Geologic setting

Geologic description

Tabular color anomaly centered on andesite (or altered diorite?) dikes cutting the Unalaska Formation (see Drewes and others, 1961). Occurrence contains 3 percent disseminated sulfides, largely pyrite(?) over an area 300 feet (90 m) by 2 miles (3.2 km). No chalcopyrite was seen.
Geologic map unit (-167.03517693576, 53.6991429001125)
Mineral deposit model Porphyry Cu (Cox and Singer, 1986; model 17), Epithermal gold veins (Cox and Singer, 1986; model 25c?).
Mineral deposit model number 17, 25c?
Age of mineralization Miocene or younger
Alteration of deposit Rocks show propylitic alteration zoned from epidote on periphery to chlorite in interior. Argillic alteration occurs in innermost zones. Partial leaching was noted.

Production and reserves

Workings or exploration Brief reconnaissance mapping and 1 soil sample reported in Christie (1974). Soil sample (W-6) showed 13 ppm Mo, 3.4 ppm Ag, and 0.02 ppm Au.
Indication of production None


MRDS Number A106020


Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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 4/14/1994