Unnamed (east of Chakina River)

Occurrence, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale A-6
Latitude 61.0782
Longitude -142.9973
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a ridge crest east of the Chakina River. It is at an elevation of about 5,800 feet, about 1,000 feet southeast of peak 6015 and about 3,000 feet northwest of peak 6165. The site is in the NW1/4 of section 19, T. 9 S., R. 14 E. of the Copper River Meridian. This is locality 20 of MacKevett (1976); it is probably accurate to within about 500 feet.

Geologic setting

Geologic description

This occurrence consists of serpentinized ultramafic rocks with minor chromite and disseminated sulfide minerals. A sample contained 10 percent magnesium, 150 parts per million (ppm) cobalt, 3,000 ppm copper, and 2,000 ppm nickel (MacKevett, 1976). The host alpine-type ultramafic body which is about 1.5 mile long and 0.2 mile wide is within upper Paleozoic metamorphic rocks (MacKevett, 1978).
Geologic map unit (-142.999336407346, 61.0777456464749)
Mineral deposit model Podiform chromite (Cox and Singer, 1986; model 8a)
Mineral deposit model number 8a
Alteration of deposit Sepentinization.

Production and reserves

Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References