Red Mountain Washington

Region West, Northwest
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Cluster of tungsten-bearing prospects; porphyry-related, breccias, propylitic alteration; includes Glacier Peak porphyry copper deposit.
Identified resources Indicated resources and past production of copper, molybdenum, silver, and tungsten.
Production Red Mountain (1930-1940): 15,000 tons ore.
Status Past mining and exploration.
Estimated resources Glacier Peak prospect: 50 to 100 million tons of ore with minimum grades of 0.027% W, 0.025% Mo, 0.45% Cu, 11.32 g/mt Ag, and 0.68 g/mt Au. Red Mountain resources (in 1983): 3.8 Mt at 1.32 Cu, 20.57 g/t Ag.
Geologic maps Cater and Crowder (1967), scale 1:62,500; Washington Division of Geology and Earth Resources (2016), scale 1:100,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Jurassic metasedimentary and metavolcanic rocks intruded by an Oligocene granodiorite batholith, deposits seemingly following a N-S structural trend.
Deposits Glacier Peak (MRDS dep_id: 10008495), Red Mountain (MRDS dep_id: 10008893), Keefer Brothers (MRDS dep_id: 10107740), Esmeralda (MRDS dep_id: 10048447).
Evidence from mineral occurrences MRDS.
Geochemical evidence Numerous soil samples with enriched metal concentrations in literature.
Geophysical evidence Unknown.
Evidence from other sources Industry drilling and ore grade reports from the 1940s-90s.
Comments The deposit area is entirely encompassed within a wilderness area. Some select parcels of private ownership (former mines) exist, but access and feasibility of mining is extremely low.
Cover thickness and description Exposed at surface and reaches to some depth.
Authors Daniel W. Eungard.
New data needs High resolution mapping and geophysics.
Geologic mapping and modeling needs Partial mapping of three to four quadrangles at 1:24,000 scale or better resolution.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric survey. Gravity may not be helpful with the similarity to the host/intrusive rock types.
Digital elevation data needs Lidar complete.