Unnamed (on a south tributary of Sheep River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cr; Ni; Sb
Other commodities Sn

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale A-5
Latitude 62.1864
Longitude -149.0954
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,500 feet, about 0.4 mile southwest of the junction of the Sheep River and its principal south tributary. It is in the NE1/4 sec. 9, T. 24 N., R. 2 E., Seward Meridian. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description

This occurrence consists of float of of altered mafic metavolcanic rocks and serpentinite(?). No sulfides are visible (Csejtey and Miller, 1978). Float samples of pyroxenite(?) contain up to 3,000 parts per million chromium, 500 parts per million nickel, 700 parts per million antimony, and 20 parts per million tin (Miller and others, 1978).
Geologic map unit (-149.097612125442, 62.185896071616)
Mineral deposit model Komatiitic Ni-Cu (Cox and Singer, 1986; model 6a)
Mineral deposit model number 6a
Alteration of deposit The mafic metavolcanic rocks are altered (Csejtey and Miller, 1978) but the type of alteration is not specified.

Production and reserves

Workings or exploration Only limited sampling by the U.S. Geological Survey (Miller and others, 1978).
Indication of production None