Unnamed (west of Sithylemenkat Lake)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Co; Cr
Other commodities Ni
Ore minerals chromite; magnetite
Gangue minerals serpentine

Geographic location

Quadrangle map, 1:250,000-scale BT
Quadrangle map, 1:63,360-scale A-3
Latitude 66.1281
Longitude -151.4485
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,100 feet on the ridge about 0.75 mile west-northwest of the outlet of Sithylemenkat Lake. The location is accurate to within one-half mile.

Geologic setting

Geologic description

This occurrence consists of chromite as an accessory mineral in mafic and ultramafic rocks (Foley, 1992). The rocks are part of the Caribou Mountain-Melozitna ultramafic belt which hosts chromite occurrences elsewhere. The rocks that define the belt consist of serpentinized dunite, peridotite, and gabbro. A serpentinite sample from a frost boil contains 700 ppm cobalt, 3,000 ppm chromium, and 500 ppm copper (Foley, 1992). Kurtak and others (1999 and 2002) report that 3 samples of serpentinized dunite and/or gabbro contain as much as 0.74 percent chromium, 120 ppm cobalt, and 2,400 ppm nickel. Disseminated chromite was observed in the sample with the highest chromium value.
Geologic map unit (-151.451137884787, 66.1276111277059)
Mineral deposit model Podiform chromite (Cox and Singer, 1986; model 8a).
Mineral deposit model number 8a
Alteration of deposit Serpentinization.

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None

Additional comments

See also: Caribou Mountain (BT011).