Unnamed (southwest of West Fork Rainy Creek)

Occurrence, Active

Commodities and mineralogy

Main commodities Cr
Ore minerals chromite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.2957
Longitude -145.986
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,900 feet on a southeast-trending ridge southwest of West Fork Rainy Creek. It is in the NE1/4SE1/4 section 3, T. 19 S., R. 9 E., Fairbanks Meridian. It corresponds to locality S65 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

This occurrence is in Late Triassic gabbro that intrudes the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). Rock sample 79NK027A contains more than 5,000 parts per million chromium (Nokleberg and others, 1991). Chromite is probably sparsely disseminated in olivine cumulate at the site.
Geologic map unit (-145.988259621642, 63.295280927242)
Mineral deposit model Chromite disseminated in a layered mafic-ultramafic complex.
Age of mineralization Late Triassic.

Production and reserves

Workings or exploration The occurrence is on active claims of MAN Resources.
Indication of production None

Additional comments

The Broxson Gulch cat trail cuts through the area.