Unnamed

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cr
Other commodities Ni
Ore minerals chromite

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale C-5
Latitude 61.63
Longitude -148.65
Nearby scientific data Find additional scientific data near this location
Location and accuracy Top of unnamed 7,100 ft peak, nearly surrounded by glaciers. Meltwater from glaciers feed Wolverine Creek, Carpenter Creek, and other unnamed tributaries of Matanuska River. Sec. 24, T. 18 N., R. 4 E., of the Seward Meridian. Accurate within 1 mile. Locality 46 from Cobb (1972), and locality 35 of MacKevett and Holloway (1977).

Geologic setting

Geologic description

Ultramafic rocks of the Jurassic Wolverine Complex. According to Clark (1972), dunite contains chromite-rich bands 0.5-1 inch thick at the bases of 6 to 12 inch thick layers of olivine cumulate. Chromite bands comprise approximately 5 percent of outcrop and minor anomalous nickel occurs nearby in associated ophiolitic rocks.
Geologic map unit (-148.652225277004, 61.6294733361497)
Mineral deposit model Podiform chromite or Alaskan PGE (Cox and Singer, 1986; models 8a or 9).
Mineral deposit model number 8a or 9
Age of mineralization Lower to Middle Jurassic.
Alteration of deposit Slight serpentinization of olivine.

Production and reserves

Workings or exploration Surface mapping and sampling.
Indication of production None

Additional comments

Concentration of chromite is not economical for mining (Clark, 1972).

References

MRDS Number A011647
Reporters D.P. Bickerstaff (USGS contractor); S.W. Huss (USGS)
Last report date 7/30/1998