Unnamed (on Sawtooth Mountain)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale B-6
Latitude 65.382
Longitude -149.534
Nearby scientific data Find additional scientific data near this location
Location and accuracy Prospect site is a large area northwest of the Sawtooth Mountain mine (ARDF LG006; Cobb (1972, MF-413), loc. 2) and west of VABM Tooth. It apparently spans SW1/4 sec. 36, T.7 N., R. 10 W and the N1/2 sec. 2, T. 6 N., R. 10 W., of the Fairbanks Meridian on Sawtooth Mountain. Latitude and longitude are approximate and near the center of the prospect area and are accurate wiItin about 1/2 mile.

Geologic setting

Geologic description

Rock samples taken from 1987 to 1993 by American Copper and Nickel Company (ACNC), WGM, Placer Dome and Australia Scotland and America (ASA) 27 yielded greater than 10 ppm gold with the highest containing 103 ppm gold, located approximately 1 mile north of the stibnite mine shaft (ARDF LG006). The drill intercepts showing gold mineralization were found in quartz veins and are strongly associated with arsenopyrite (ASA-Montague, 1995; American Copper and Nickel Company, 1989; WGM, 1989).
Geologic map unit (, )
Mineral deposit model Intrusion hosted gold.
Age of mineralization The granitic rock has been K-Ar dated at 91.0+/-0.9 Ma (Weber and others, 1992).
Alteration of deposit Quartz and arsenopyrite (ASA-Montague, 1995).

Production and reserves

Workings or exploration From 1987 through 1993, American Nickel and Copper Company, WGM, Placer Dome and Australia Scotland and America (ASA) collected over 200 rock samples from the Sawtooth Mountain quartz monzonite intrusion. 27 of the rock samples yielded greater than 10 ppm gold with the highest of 103 ppm gold located approximately 1 mile north of the stibnite mine shaft. In 1993 ASA collected 595 soil samples in a 400 foot X 400 foot grid over the intrusion. Three core holes were drilled in the near the surface exposure of the quartz monzonite intrusion, within 1 mile west of the stibnite mine shaft. Core holes SM93-01, SM93-02 both encountered 5 intercepts less than two feet wide with grades of over 5.0 ppm Au. Core hole SM93-03 encountered 4 intercepts less than two feet wide with grades of over 2.0 ppm Au. The gold mineralization drill intercepts were found in quartz veins and are strongly associated with arsenopyrite (ASA-Montague, 1995; American Nickel and Copper Company, 1989; WGM, 1989).
Indication of production None

References

Reporters V.C. Zinno (Alaska Earth Sciences, Inc.), F.H. Wilson, USGS
Last report date 3/15/2016