Red Mountain

Prospect in Alaska, United States with commodity Platinum

Geologic information

Identification information

Deposit ID 10307611
Record type Site
Current site name Red Mountain

Geographic coordinates

Geographic coordinates: -161.73268, 58.93925 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Platinum Primary

Materials information

Materials Type of material
Platinum Ore
Palladium Ore
Iridium Ore
Osmium Ore
Rhodium Ore
Ruthenium Ore


  • (Local) Dunite is locally serpentenized.

Mineral occurrence model information

Model code 23
USGS model code 9
Deposit model name Alaskan Cr-Pt (PGE)
Mark3 model number 120

Nearby scientific data

(1) -161.73268, 58.93925

Comments on the geologic information

  • 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 commun., 2000), but in general the exploration results were apparently not encouraging.
  • Age = 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.

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active

Mining district

District name Goodnews Bay

Comments on the workings information

  • Workings / 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF HG007

Bibliographic references

Comments on the references

  • Primary Reference = Alaska Earth Sciences, 2000

General comments

Subject category Comment text
Deposit Model Name = Alaskan PGE (Cox and Singer, 1986; model 9)

Reporter information

Type Date Name Affiliation Comment
Reporter 18-MAR-01 Travis L. Hudson Applied Geology