Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Sb
Ore minerals arsenopyrite; gold; pyrite
Gangue minerals limonite; quartz

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-1
Latitude 67.4895
Longitude -150.1568
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,250 feet on the divide between Fay creek and Swift Creek. It is just north of the center of the southern boundary of section 23, T. 31 N., R. 12 W., of the Fairbanks Meridian. The location is accurate.

Geologic setting

Geologic description

Brosge and Reiser (1972) collected a series of soil and rock samples, and quartz veins for approximately 0.5 mile across this area. The quartz veins contain elevated gold, silver, antimony, and arsenic. One of the samples, described as a thin quartz vein contains 5.8 and 0.97 ppm gold in replicate analyses. Eden (2000) reported quartz veins with arsenopyrite and pyrite exposed in a trench in the same general area. Several trench and outcrop samples of oxidized, pyrite- or arsenopyrite-bearing quartz contained up to 90 ppb gold and 4,760 arsenic. The veins strike east-west and dip steeply. The pyrite and arsenopyrite form euhedral crystals in open spaces. The rocks in the area are Upper Devonian quartz-mica schist, phyllite, and micaceous schist (Eden, 2000).
Geologic map unit (-150.159550188045, 67.4890753094557)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Alteration of deposit Iron-oxide alteration.

Production and reserves

Workings or exploration Surface sampling and trenching.
Indication of production None

Additional comments

See also: Smith Creek Dome (WI110).