| Basis for focus area |
Tem Piute, Oak Spring, and Shoshone Mining Districts. |
| Identified resources |
Historical production of tungsten. |
| Production |
Emerson mine (1938-1982): 50,0000 short tons units WO3 (Stager and Tingley, 1988); Scheelite Chief mine (1916-1956): 107,830 short tons units WO3 (Stager and Tingley, 1988). |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Horton and others (2017), scale 1:500,000; Wyant and Lemmon (1951), scale 1:12,150; Miller, Brown and others (1993), scale 1:24,000; Barnes and others (1963), scale 1:24,000; Rogers and Noble (1969), scale 1:24,000. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Granite stocks cut limestone resulting in thick bodies of tactite in bands parallel to bedding; the bulk of the scheelite occurs in garnet-tactite, but some rich deposits are in small masses of calcite-fluorite-sphalerite rocks formed in marble remnants in adjoining tactite bodies (Wyant and Lemmon, 1951). Skarns in the Oak Springs district are associated with the Twinridge pluton and Cretaceous Climax stock. |
| Deposits |
Schofield mine (North Tem Piute mine) (MRDS dep_id: 10107653), Koyen scheelite mine (MRDS dep_id: 10222267), Emerson mine (MRDS dep_id: 10149742; USMIN Site_ID: NV00119), Shoshone mining district ( USMIN Site_ID: NV00136). |
| Evidence from mineral occurrences |
MRDS; USMIN. |
| Geochemical evidence |
Minerals in tactite are garnet, quartz, actinolite, calcite, fluorite, pyrite, pyrrhotite, diopside, sphalerite, scheelite, chlorite, hematite, clinozoisite, epidote, molybdenite, and powellite (Wyant and Lemmon, 1951). |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Cover thickness and description |
Exposed at the surface. |
| Authors |
John L. Muntean. |
| New data needs |
Geologic mapping, geophysics. |
| Geologic mapping and modeling needs |
Updated geologic mapping. |
| Geophysical survey and modeling needs |
High-resolution, Rank 1 aeromagnetic and aeroradiometric surveys. |
| Digital elevation data needs |
Lidar inadequate. |
