Unnamed (between Reindeer Hill and Alpha Ridge)

Prospects, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Mo
Ore minerals galena; hematite; malachite; pyrite; tetrahedrite
Gangue minerals graphite

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-3
Latitude 63.5332
Longitude -151.0247
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents two possibly related prospects on the northwest slope of Alpha Ridge nearly due south of Reindeer Hill. The southern prospect is in a minor drainage at an elevation of about 2820 feet; the northern prospect is about 750 feet north-northeast of the southern prospect, at an elevation of about 2790 feet. The site corresponds to location 16 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

This prospect is in metafelsite and graphitic garnet-chlorite-quartz schist and quartzite of the Birch Creek Schist (Thornsberry, McKee, and Salisbury, 1984, v. 2, location 16). The rocks are coated with hematite and malachite. Small amounts of pyrite, galena, and possibly tetrahedrite occur in sloughed pits. Samples collected from pits in the graphitic schist contained 0.048 to 0.175 percent copper, a trace of lead, and about 400 ppm zinc. Molybdenum values were as much as 105 ppm. Gold and silver were not determined. The existence of buried sulfide deposits nearby is suggested by ferricrete occurrences.
Geologic map unit (-151.026987504919, 63.532691564593)
Mineral deposit model Disseminated sulfide in metarhyolite and graphitic schist.
Age of mineralization Possibly as old as Precambrian, the protolith age of Birch Creek Schist, or as young as Eocene, the emplacement age of nearby plutons (see MM091).
Alteration of deposit Local oxidation of iron and copper minerals.

Production and reserves

Workings or exploration Several small pits, largely sloughed.
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve.

References