Big River

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale SB
Quadrangle map, 1:63,360-scale D-6
Latitude 55.94
Longitude -159.93
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on the Alaska Peninsula near the head of Big River, which enters Stepovak Bay just west of Stepanof Flats (Christie, 1974, color anomaly 85; MacKevett and Holloway, 1977, locality 5; Wilson and others, 1988, locality 5). The map site is at an elevation of 1,200 feet, at the northeast corner of sec. 5, T. 49 S., R. 68 W., of the Seward Meridian. The location is accurate to within 1 mile.

Geologic setting

Geologic description

The country rocks at this site are Quaternary volcanic rocks (Wilson and others, 1995). Christie (1974) described this occurrence as disseminated pyrite in vesicular volcanic rocks. Fields (1977), however, describes a color anomaly near the head of Big River that is developed in pyritized andesites, agglomerates, acid tuffs, and sedimentary rocks. Apparently, there are several color anomalies in this area.
Geologic map unit (-159.932048775373, 55.9391933285112)
Age of mineralization Quaternary.
Alteration of deposit Pyritization.

Production and reserves

Workings or exploration An Aleut-Quintana-Duval joint venture examined the area in of this occurrence 1974 (Christie, 1974). Bear Creek Mining Company examined it in 1977 (Fields, 1977). The U.S. Geological Survey sampled in this general area in the mid-1980s (Wilson and others, 1988).
Indication of production None

References

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Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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.)
Fields, E.D., 1977, 1976 Annual report: Alaska search, Chignik area-Bristol Bay region: Bear Creek Mining Company, 44 p., 22 map sheets. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters S.H. Pilcher
Last report date 11/2/2000