Southwest Washington bauxite

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

Information leading to the delineation of this focus area

Basis for focus area Laterite: Washington Industrial Mineral Database and MRDS locations.
Identified resources Identified resources and historical production of aluminum (bauxite).
Production Washington bauxite district (1916-1922): bauxite was mined from 4 pits producing 16,000 tons of bauxite.
Status Past mining and past exploration.
Estimated resources Potential resources of 70 million tons estimated for a 10-ft-thick deposit over an area of 2200 acres; large kaolin deposit may occur in the area (Livingston, 1966).
Geologic maps Evarts (2001), scale 1:24,000; Livingston (1966), scale 1:24,000.
Geophysical data Adequate aeromagnetic coverage, inadequate aeroradiometric coverage, poor gravity.
Favorable rocks and structures Weathered Miocene basalt flows.
Deposits Cowitz Clay (MRDS dep_id_ 10180398).
Evidence from mineral occurrences MRDS.
Geochemical evidence Selected samples show aluminum oxide enriched to 30-40% (Sohn, 1952).
Geophysical evidence None.
Evidence from other sources None.
Comments Mostly private land. Short distance to major road, rail, and barge transportation networks.
Cover thickness and description 20 ft loess.
Authors Daniel W. Eungard.
New data needs Detailed geologic mapping and geochemical analysis.
Geologic mapping and modeling needs One to 2 1:24,000 scale quadrangle maps or higher resolution.
Geophysical survey and modeling needs Adequate geophysics. Unlikely to produce better results with higher resolution data.
Digital elevation data needs Lidar complete.