Day Harbor

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-6
Latitude 60.0322
Longitude -149.1431
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located at or just above tidewater about 3 miles southwest of the head of Day Harbor. It is near the center of section 5, T. 2 S., R. 2 E., of the Seward Meridian. This is location 96 of Cobb and Tysdal (1980) and location S-191 of Jansons and others (1984). This location is accurate to within half a mile.

Geologic setting

Geologic description

The occurrence consists of a 4-foot-wide shear zone between a coarse-grained gabbro and a peridotite; the zone contains disseminated sulfide minerals consisting mostly of pyrrhotite and pyrite, with possibly a little chalcopyrite (Grant and Higgins, 1909). Bedrock in this area is part of the Resurrection Bay Ophiolite complex, which is part of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). No other information reported in the literature.
Geologic map unit (-149.145233443096, 60.0316431898253)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration There are no reported workings, improvements, or assay results.
Indication of production None

References

MRDS Number A010379

References

Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 1/2/2001