Alaska-Pioneer-Sourdough, Steinmetz, and Alaska Commercial Co.

Mine, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Ag; Au
Ore minerals arsenopyrite; bornite; chalcopyrite; marcasite; pyrite; specularite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale D-7
Latitude 60.855
Longitude -146.543
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents a mine and several prospects on the north side of inner Landlocked Bay. The map site is at an elevation of about 500 feet on a south-facing bluff above the bay. It is in the SW1/4 sec. 6, T. 12 S., R. 7 W., of the Copper River Meridian. The site is accurately located to within 1000 ft. This location is a combination of sites C-72, C-75, and C-80 of Jansons and others (1984), and site #14 of Cobb (1972: MF-392).

Geologic setting

Geologic description

The mineral deposits at this site are in sheared mafic volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985). They consist of 2-inch- to 4-ft.-wide lenses of massive sulfide accompanied by quartz gangue. Metalliferous minerals include arsenopyrite, bornite, chalcopyrite, marcasite, pyrite, and specularite.
Early copper values reportedly were 11.4% to 12.5% Cu (Grant, 1906). Jansons and others (1984) report that a grab sample from the area contained 7.9% Cu. Chip samples contained 0.2%-3.9% Cu, along with a trace to 0.11 oz Au/ton.
Geologic map unit (-146.544993772932, 60.8544515309008)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Probably Tertiary based on the age of the host rock.

Production and reserves

Workings or exploration The first discovery of copper (1897) in Prince William Sound was made in this area (Schrader, 1900). Capps and Johnson (1915) reported several adits, open cuts and a shaft. Early copper values reportedly were 11.4% to 12.5% Cu (Grant, 1906). Jansons and others (1984) report that a grab sample from the area contained 7.9% Cu. Chip samples contained 0.2%-3.9% Cu, along with a trace to 0.11 oz Au/ton.
Indication of production Yes; small
Reserve estimates 500 tons @ 2.27% Cu inferred reserves (Jansons and others, 1984).
Production notes 720 lbs. copper from 70 tons of ore shipped in 1905 (Grant, 1906).

Additional comments

Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.
Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

References

MRDS Number 10307358

References

Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.
Reporters S.W. Nelson, Anchorage, AK
Last report date 6/10/2000