| Basis for focus area |
Prospective geology, geochemical anomaly, historical production of greisen-related granite Sn deposits, and additional ARDF occurrences. |
| Identified resources |
Identified resources of tin and tungsten. Historical production of tin. |
| Production |
Lost River mine, 1952-1955. |
| Status |
Past mining. Current exploration and re-evaluation of lithium, niobium, and tantalum, fluorspar. Past exploration focused on tin at Lost River mine. 1980s industry drilling at Kougarok for tantalum (current re-evaluation for Sn, Nb, Ta). |
| Estimated resources |
Kougarok: 5.7M short tons at 0.39% Sn, with known W; Lost River mine has significant known skarns. |
| Geologic maps |
No modern mapping better than 1:250,000 scale. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Evolved felsic intrusions, greisens, carbonate horizons. |
| Deposits |
Lost River, Kougarok. |
| Evidence from mineral occurrences |
ARDF. |
| Geochemical evidence |
Anomalous Sn, W, and other pathfinders in HUC's; granites with appropriate geochemical characteristics of highly evolved compositions. |
| Geophysical evidence |
No data. |
| Evidence from other sources |
High prospectivity determination based on Karl and others (2016). |
| Cover thickness and description |
Unknown. |
| Authors |
Douglas C. Kreiner, James V. Jones III, Melanie B. Werdon. |
| New data needs |
New mapping, geophysics, and updated geochemical sampling. |
| Geologic mapping and modeling needs |
Mapping at 1:100,000 scale or better. |
| Geophysical survey and modeling needs |
Aeromagnetics and radiometrics collected at Rank 2. |
| Digital elevation data needs |
IfSAR coverage is complete over entire focus area. |
