Unnamed (northeast of benchmark Verde)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cr; Ni
Other commodities Co
Ore minerals chromite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale A-7
Latitude 61.2417
Longitude -143.4093
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in the headwaters of an unnamed north tributary to the Klu River. It is at an elevation of about 5,400 feet, 1.7 miles northeast of triangulation station Verde (elevation 6233) and 6,500 feet northwest of elevation 5433. The site is in the SE 1/4 of section 22, T. 7 S., R. 11 E. of the Copper River Meridian. This is locality 42 of MacKevett (1976); the location is probably accurate to within 1,000 feet.

Geologic setting

Geologic description

This occurrence consists of a serpentinized ultramafic body that is in fault contact with gabbro (MacKevett, 1976). A sample of the serpentinite contained greater than 10 percent magnesium, 100 parts per million (ppm) cobalt, 3,000 ppm chromium, and 2,000 ppm nickel. The mafic and ultramafic rocks are emplaced in Upper Paleozoic metamorphic rocks (MacKevett, 1978).
Geologic map unit (-143.411357500936, 61.241245975243)
Mineral deposit model Podiform chromite? (Cox and Singer, 1986; model 8a)
Mineral deposit model number 8a?
Age of mineralization Late Paleozoic or younger based on the age of the metamorphic country rocks.
Alteration of deposit Serpentinization.

Production and reserves

Workings or exploration Only limited surface sampling.
Indication of production None

Additional comments

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

References