Siwash Bay

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-2
Latitude 60.9661
Longitude -147.6404
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is at an elevation of 1,000 feet on the north side of Siwash Bay. It is in the SW1/4 section 11, T. 10 N., R. 11 E., of the Seward Meridian. This is location 87 of Cobb and Richter (1972), location 112 of MacKevett and Holloway (1977), location 181 of Cobb and Tysdal (1980), and location S-119 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The only information about this occurrence is that it is a copper prospect, possibly a massive sulfide occurrence, in sedimentary rock of the lower Orca Group of Tertiary age (Cobb and Tysdal, 1980).
Geologic map unit (-147.642474854941, 60.9655807938641)
Mineral deposit model Besshi massive sulfide? (Cox and Singer, 1986; model 24b?).
Mineral deposit model number 24b?
Age of mineralization Tertiary or younger; the occurrence is in Tertiary Orca Group rocks.

Production and reserves

Indication of production None


MRDS Number A010530


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 (Anchorage)
Last report date 3/9/2000