| Basis for focus area |
Cluster of tungsten-bearing prospects; porphyry-related. |
| Identified resources |
Past production of gold. |
| Production |
Holden-Campbell mine produced a considerable amount of Au ore from polymetallic veins (Derkey and others, 1990). |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Washington Division of Geology and Earth Resources (2016), scale 1:100,000. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Tonalitic gneiss of the Cretaceous Methow Gneiss cut by Eocene (?) dikes. |
| Deposits |
Holden-Campbell mine (MRDS dep_id: 10008486), Minnie mine (MRDS dep_id: 10056011), Methow mine (MRDS dep_id: 10104287). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Assays indicate 0.25% WO3 at Holden-Campbell mine; 0.25% scheelite at Minnie mine. |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Comments |
The deposit area is largely covered by state owned and national forest land. Proximity to the town of Methow and its watershed may be a concern for future development. |
| 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 in progress or planned/funded. |
