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True Fissure Mine, Bryant District (Hecla District), Beaverhead Co., Montana, USAi
Regional Level Types
True Fissure MineMine
Bryant District (Hecla District)Mining District
Beaverhead Co.County
MontanaState
USACountry

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Key
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Latitude & Longitude (WGS84): 45° 36' 19'' North , 112° 56' 4'' West
Latitude & Longitude (decimal): 45.60528,-112.93444
GeoHash:G#: c2peqn5tu
USGS MRDS Record:10197094
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Butte-Silver Bow (Balance)33,525 (2013)39.4km
Dillon4,210 (2017)49.0km


REF:Deposit:: MONT. BUR. MINES AND GEOL. MEMOIR 25, 1948, P. 61.
Deposit:: MONT. BUR. MINES AND GEOL. BULLETIN 85, 1972, P. 112.
Commodities (Major) - Silver; (Trace) - Copper, Lead, Zinc
Development Status: Past Producer

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


No minerals currently recorded for this locality.

List of minerals for each chemical element

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cretaceous
66 - 145 Ma



ID: 3192025
Mesozoic intrusive rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Mississippian - Devonian
323.2 - 419.2 Ma



ID: 2128583
Three Forks Formation and Jefferson Formation, undivided

Age: Paleozoic (323.2 - 419.2 Ma)

Stratigraphic Name: Three Forks Formation; Jefferson Formation

Lithology: Major:: {0-50m(calcareous siltstone, argillaceous siltstone, sandstone, shale, limestone, argillaceous limestone)| 30-200m(dolomite, silty dolomite, shaly dolomite)}; Minor:: {0-50m(dolomite solution breccia)| 30-200m(shale, solution breccia)}

Reference: Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al. Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington. U.S. Geological Survey Open-File Report 2005-1235 Version 1.0. [25]

Tournaisian - Famennian
346.7 - 372.2 Ma



ID: 2925155
Three Forks and Jefferson Formations

Age: Paleozoic (346.7 - 372.2 Ma)

Stratigraphic Name: Three Forks Formation; Jefferson Formation

Description: Three Forks Formation (MDt): Sappington Member (upper part of formation):yellowish orange and yellowish gray siltstone. Trident Member (middle part of formation): greenish gray and light olive gray, fossiliferous, calcareous shale that contains interbeds and nodules of fossiliferous, argillaceous limestone. Logan Gulch Member (lower part of formation): yellowish gray and grayish red, argillaceous limestone breccia and shale breccia that may include dolomitic siltstone. Marine to restricted marine with evaporite basins. Thickness as much as 185 m (607 ft). Jefferson Formation (Dj): Birdbear Member (upper part of formation): light to medium gray, sucrosic dolomite. Lower part of formation: grayish black, commonly petroliferous dolomite or limestone that may be interbedded with light gray quartzite. Marine. Thickness as much as 520 m (1,706 ft).

Comments: Original map source: Vuke, S.M., Porter, K.W., Lonn, J.D., and Lopez, D.A., 2007, Geologic Map of Montana - Compact Disc: Montana Bureau of Mines and Geology: Geologic Map 62-C, 73 p., 2 sheets, scale 1:500,000. This map was digitized in 2012 as a result of a contract betwe

Lithology: Major:{limestone,shale,dolostone}, Minor:{siltstone,sedimentary breccia}, Incidental:{quartzite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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