Unnamed (near Chakina River-West Fork junction)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cr; Ni
Ore minerals chromite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale A-6
Latitude 61.1148
Longitude -143.1409
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the ridge between Chakina River and the West Fork of the Chakina River. It is on the west side of a saddle whose elevation is about 4,655 feet , almost in the center of section 5, T. 9 S., R. 13 E. of the Copper River Meridian. This is locality 21 of MacKevett (1976); the location is probably accurate to within about 1,000 feet.

Geologic setting

Geologic description

This occurrence consists of a sheared and serpentinized alpine-type ultramafic body, about 1 mile long, that is localized along the Border Ranges fault (MacKevett, 1976, 1978). The ultramafic is assumed to be similar to the serpentinized body at MC197, samples of which contained 10 percent magnesium, 150 parts per million (ppm) cobalt, 3,000 ppm chromium, and 2,000 ppm nickel (MacKevett, 1976). The ultramafic body is in contact with upper Paleozoic metamorphic rocks (MacKevett, 1978).
Geologic map unit (-143.1429422924, 61.1143461657944)
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 limited surface examination.
Indication of production None

Additional comments

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

References