Unnamed (near VABM Upselat)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Au
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale B-6
Latitude 62.4
Longitude -155.928
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is situated on a distinct, northeast-trending ridgeline about 9 kilometers south of the Kuskokwim River and 4 kilometers southwest of VABM Upselat, at an elevation of 1,475 feet (450 m) in the NE1/4 sec. 27, T. 27 N., R. 36 W., of the Seward Meridian. The reporter investigated the site in 1977 and again in 1989 (as station nos. 77BT301 and 89BT69).

Geologic setting

Geologic description

This unnamed occurrence is associated with a small, 2 square kilometer alaskite pluton that intrudes the Late Cretaceous Kuskokwim Group. A prominent northwest trending lineament - possibly a fault - forms the eastern boundary of the alaskite. The alaskite is undated, but thought to be correlative with other Late Cretaceous-early Tertiary plutonic suites in the Kuskokwim Mineral Belt (Bundtzen and Miller, 1997). A stockwork-bearing hornfels that crops out 1.5 kilometers east of the alaskite pluton may indicate a larger intrusion at depth. Mineralization occurs as ferricrete stained, pyritic-quartz veins and breccia in hornfels. Two chip samples collected of mineralized zones average 2.33 grams/tonne silver and 0.68 grams/tonne gold.
Geologic map unit (-155.930351390902, 62.3993484476053)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Ferricrete oxidation common.

Production and reserves

Workings or exploration The reporter investigated the site in 1977 as part of an ADGGS minerals appraisal. Two chip samples collected from the mineralized zone in alaskite average 2.33 grams/tonne silver and 0.68 grams/tonne gold.
Indication of production None
Reserve estimates None.


MRDS Number 10307829


Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting)
Last report date 11/25/1998