Unnamed (upper south fork of Stampede Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Mo; Sb; Zn
Ore minerals chalcopyrite; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-1
Latitude 63.7306
Longitude -150.3871
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 2750 feet at the head of an unnamed south fork of Stampede Creek. It is approximately at the midpoint of the boundary between sections 1 and 2, T. 14 S., R. 15 W., Fairbanks Meridian. The occurrence corresponds to number 65a of Bundtzen, Smith, and Tosdal (1976), and 108 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

The country rocks in the area of this occurrence are quartz-feldspar schist and gneiss of the upper Precambrian Birch Creek Schist, and graphitic quartzite either of the Birch Creek Schist or of the lower Paleozoic Keevy Peak Formation. The rocks appear to be cut by NE-striking faults subsidiary to the Stampede fault (Thornsberry, McKee, and Salisbury, 1984, pl. K-4; Hawley and Associates, 1978, fig. 4-1-A(2)).
The occurrence consists of a foot-thick quartz vein that contains disseminated chalcopyrite and pyrite, and is stained by malachite (Bundtzen, Smith, and Tosdal (1976, occurrence 65a). Hawley and Associates (1978; fig. 4.1-A(2), samples 128-131) collected soil samples on the ridge above the occurrence that contained up to 3.8 ppm silver, 10 ppm molybdenum, 46 ppm antimony, and 255 ppm zinc.
Geologic map unit (-150.389396942486, 63.7301094953493)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The deposit is assumed to be Eocene (see record MM091).
Alteration of deposit Oxidation of copper mineral.

Production and reserves

Workings or exploration The vein was discovered and described by Bundtzen, Smith, and Tosdal (1976). Later investigators mapped and collected soil samples in the area (Hawley and Associates, 1978).
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve.

References