Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale FP
Quadrangle map, 1:63,360-scale D-5
Latitude 54.8217
Longitude -163.4167
Nearby scientific data Find additional scientific data near this location
Location and accuracy Approximate location is about 5 km south of False Pass community. Anomaly no. 49 of Christie (1974) and no. 2 of MacKevett and Holloway (1977, p. 11). Location description is poor; however, location apparently is southwest of Whirl Point on Unimak Island.

Geologic setting

Geologic description

Christie (1974) briefly examined a poorly defined color anomaly 2 mi (3.2 km) in diameter developed in andesitic volcanic flows, breccia, and tuff intruded by multiple diorite stocks(?). The diorite contact metamorphoses the volcanic rocks and pyrite is disseminated in both the diorite and the volcanic rocks. The diorite is pervasively propylitically altered.
Geologic map unit (-163.418688533923, 54.8208131568262)
Mineral deposit model Epithermal gold vein
Mineral deposit model number 25
Age of mineralization Miocene or younger
Alteration of deposit Pervasive propylitic alteration of diorite within the color anomaly and local(?) silicification. Hydrothermal minerals reported include clay, chlorite, and epidote.

Production and reserves

Workings or exploration Brief reconnaissance geologic mapping and a few silt samples were collected. One sample had 0.01 ppm gold. Occurrence apparently has not been adequately examined for epithermal gold vein potential.
Indication of production None

Additional comments

Quartz veining is not mentioned by Christie (1974), but this does not mean it is absent, inasmuch as his focus was mainly on porphyry mineralization.


MRDS Number A106113


Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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 G.D. DuBois; F.H. Wilson
Last report date 5/6/1994