Sawtooth Mountain

Mine, Inactive

Commodities and mineralogy

Main commodities Sb
Other commodities Ag; Au
Ore minerals arsenopyrite; gold; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale B-6
Latitude 65.376
Longitude -149.524
Nearby scientific data Find additional scientific data near this location
Location and accuracy Cobb (1972, MF-413), loc. 2; NW1/4SW1/4 sec. 1, T. 6 N., R. 10 W., of the Fairbanks Meridian. This deposit is on Sawtooth Mountain. It is marked on the Livengood (B-6) quadrangle by a prospect symbol at the end of a trail up Buckeye Creek from the landing strip to the saddle on Sawtooth Mountain. The location is commonly believed to be accurate within about 50 meters.

Geologic setting

Geologic description

Massive stibnite occurs as a vertical cylinder about 3 m wide; it is hosted in argillite of Jurassic or Cretaceous flysch near a contact with Cretaceous granitic rock (Nokleberg and others, 1987; R. M. Chapman, written communication, 1985). The quartz monzonite has been K-Ar dated at 91.0+/-0.9 Ma (Weber and others, 1992). Grab samples from the dump have up to 46.2 percent Sb, 0.7 g/ton Au and 15.1 g/ton Ag (Nokleberg and others, 1987). The vein produced 590 tonnes of ore with 58 percent stibnite through 1970, with minor production in 1984 and 1985.
Geologic map unit (-149.526502300233, 65.3755410882569)
Mineral deposit model Stibnite vein (Cox and Singer, 1986; model 27d).
Mineral deposit model number 27d
Age of mineralization The granitic rock has been K-Ar dated at 91.0+/-0.9 Ma (Weber and others, 1992).

Production and reserves

Workings or exploration A shaft reached a depth of 83 feet (Saunders, 1958; ATDM PE 49-14).
Indication of production Yes; small
Production notes The vein produced 590 tonnes of ore with 58 percent stibnite through 1970, with minor production in 1984 and 1985 (Nokleberg and others, 1987).

References