Red Mountain

Prospect, Active

Commodities and mineralogy

Main commodities Pt
Ore minerals platinum group metal alloys

Geographic location

Quadrangle map, 1:250,000-scale HG
Quadrangle map, 1:63,360-scale D-6
Latitude 58.94
Longitude -161.73
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the east side of Red Mountain. It is in the border zone of the Red Mountain pluton and extends from near Fox Gulch north to beyond Clara Creek. The map site is at an elevation of about 500 feet, on the divide between Squirrel Creek and Last Chance Creek.

Geologic setting

Geologic description

The east border zone of the Jurassic Red Mountain ultramafic pluton was prospected by a series of 12 trenches located from near Fox Gulch north to beyond Clara Creek. The trenching was accompanied by surface mapping and sampling (Alaska Earth Sciences, 2000). The Red Mountain ultramafic pluton is mostly dunite, but the eastern border zone includes bands of peridotite, clinopyroxenite, and hornblende-bearing rocks that are zoned outward from dunite in that order. A 1-meter-wide zone assaying 2.26 grams of PGM per ton was identified in the trench near Fox Gulch (T. Hinderman, oral communication, 2000), but in general the exploration results were apparently not encouraging.
Geologic map unit (-161.7322264802, 58.9392161759122)
Mineral deposit model Alaskan PGE (Cox and Singer, 1986; model 9).
Mineral deposit model number 9
Age of mineralization Jurassic, the age of the Red Mountain ultramafic pluton. Hoare and Coonrad (1978) report K/Ar ages for two samples of amphibole from the southeast border of the Red Mountain pluton: 176.4 +/- 5.3 Ma and 186.9 +/- 5.6 Ma.
Alteration of deposit Dunite is locally serpentinized.

Production and reserves

Workings or exploration This prospect is an area of trenching and surface mapping and sampling. An aeromagnetic survey was flown over the Salmon River area in 1994, a gravity survey has been completed, and some controlled-source audio magneto-telluric lines have been run over selected parts of the ultramafic complex (Alaska Earth Sciences, 2000).
Indication of production None


MRDS Number 10307611


Alaska Earth Sciences, 2000, The Goodnews Bay ultramafic complexes: Unpublished data,
Reporters Travis L. Hudson
Last report date 3/18/2001