Independence

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Pb
Ore minerals arsenopyrite; galena; gold; pyrite

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale A-1
Latitude 65.029
Longitude -147.465
Nearby scientific data Find additional scientific data near this location
Location and accuracy Cobb (1972, MF-413), loc. 32; NW1/4SW1/4 sec. 1, T. 2 N., R. 1 E., of the Fairbanks Meridian. The Independence mine is on the southeast side of Twin Creek almost opposite the mouth of Skoogy Gulch; it is about 7 miles by road northeast of Fox along the Steese Highway.

Geologic setting

Geologic description

Gold is found in an east-west-striking, vertical fracture zone in coarse porphyritic granite that has been cut by quartz veins. The quartz veins are broken by iron-stained joints whose surfaces are mineralized and carry gold (Brooks, 1916; B 642; Brooks, 1918). The mineralized zone has been traced for 900 feet on the surface (Brooks, 1918). The fracture zone becomes barren where it crosses the contact from granite into the schist (Brooks, 1916; B 642). Pyrite, arsenopyrite, and galena are present (Brooks, 1916; B 642).
This deposit has been developed by two tunnels. In the upper tunnel, quartz veinlets are in a zone 8-10 inches wide in porphyritic granite. This zone is vertical and strikes N 70 E (Hill, 1933). About two-thirds of the gold is in sulfide minerals, and assays show 0.19 to 1.84 ounces of gold per ton (Cobb, 1976; OFR 76-633, p. 103).
Geologic map unit (-147.467443681209, 65.0285760142224)
Mineral deposit model Gold-quartz vein.
Alteration of deposit Joint surfaces are iron-stained.

Production and reserves

Workings or exploration Workings were badly caved by July 1931 (Hill, 1933).
Indication of production Yes; small
Production notes Probably has been minor production (Cobb, 1976; OFR 76-633, p. 103; Chapman and Foster, 1969).

References