| Basis for focus area |
Outline of mining district(s) and mineral occurrences. |
| Identified resources |
Historical production of gold, lead, silver, and zinc. |
| Production |
Last Chance mine (1943-1945): 1,174,506 lbs Pb, 2,007,769 lbs Zn, 31,000 oz Ag (Anderson, 1947c); Champagne mine (1989-1993): approximately 56,000 troy oz Au, and 500,000 oz Ag (Bennett and Gillerman, 1993, draft Regional Developments paper on Idaho Geological Survey website). |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Skipp and Kuntz (2009), scale 1:100,000; Skipp and Bollmann (1992), scale 1:24,000; Kuntz and others (2007), scale 1:100,000; Anderson (1929), scale 1:63,000. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Vein deposits in the Lava Creek district are confined to a zone of structural weakness in Tertiary volcanic rocks with facilitated intrusion of Miocene-age magma (Anderson, 1947c). |
| Deposits |
Last Chance mine (MRDS dep_id: 10110454), Hornsilver mine (MRDS dep_id: 10071907), Champagne mine (MRDS dep_id: 10289933). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Multi-media geochemistry in Adrian and others (1990). Anderson (1947c) identified Fe, Zn, Pb, Cu, Sn, Bi, Ag, and Au as metals in deposits. |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Comments |
Primarily a gold area with some base metals. Magmatic hydrothermal but with more porphyry-style alteration than most districts. One W mine in IGS database. |
| Cover thickness and description |
Oxidized and enriched silver ores were first discovered at the surface; primary base-metal sulfides are at greater depth. |
| Authors |
Virginia S. Gillerman, Reed S. Lewis, Christopher A. Tate. |
| New data needs |
High resolution geophysics, lidar. |
| Geologic mapping and modeling needs |
None requested at this time. |
| Geophysical survey and modeling needs |
High resolution, Rank 1 aeromagnetic and aeroradiometric coverage. |
| Digital elevation data needs |
Lidar in progress over northern portion of the focus area; needed elsewhere. |
