| 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. |
