Unnamed (head of Rock Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities Cd; Mo
Ore minerals galena; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.6452
Longitude -143.8745
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the east wall of a cirque at the head of Rock Creek. It is at an of elevation about 5,560 feet, 2,600 feet south of the center of section 36, T. 2 S., R. 8 E. of the Copper River Meridian. This is locality 165 of MacKevett (1976) and locality 19 of MacKevett and others (1978). The location is accurate to within about 100 feet.

Geologic setting

Geologic description

This occurrence consists of an altered zone about 2 meters wide that is developed along a prominent steep fault that separates Triassic Nikolai Greenstone to the north from Triassic Chitistone Limestone to the south (MacKevett, 1976; MacKevett and others, 1978). A sample of the altered material contained more than 2,000 parts per million (ppm) manganese, 15 ppm silver, 70 ppm cadmium, 20 ppm molybdenum, 3,000 ppm lead, and more than 10,000 ppm zinc. The altered zone at MC043 is on the same fault as this occurrence.
Geologic map unit (-143.876588570155, 61.6447363995841)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Alteration of deposit Oxidation.

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