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Fluorite No. 1 Occurrence (Grand Deposit 17), Argenta District, Beaverhead Co., Montana, USA

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Latitude & Longitude (WGS84): 45° 15' 45'' North , 112° 57' 0'' West
Latitude & Longitude (decimal): 45.26250,-112.95000
GeoHash:G#: c2p9mzb34
Other regions containing this locality:Rocky Mountains, North America
Locality type:Occurrence
Köppen climate type:BSk : Cold semi-arid (steppe) climate


REF:Deposit:: MBM & G BULL 85, 1972, P49
Deposit:: MIN RSE BEAVERHEAD NATIONAL FOREST, RI, VOL. 2 OF 2.
Deposit:: STENTZ FOREST SERVICE REPORT IN WFOC LIBRARY, P. 9.
Commodities (Major) - Barium-Barite; (Minor) - Fluorine-Fluorite
Development Status: Occurrence
Host Rock Unit: Alluvium
Host Rock: Shale


Commodity List

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


Mineral List


2 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

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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

Permian - Late Cambrian
252.17 - 501 Ma



ID: 3190831
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 501 Ma)

Comments: Central Idaho Black Shale Mineral Belt

Lithology: Limestone,argillite,siltstone,shale,sandstone

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]

Pennsylvanian - Mississippian
298.9 - 358.9 Ma



ID: 2124122
Snowcrest Range Group and Madison Group, undivided

Age: Carboniferous (298.9 - 358.9 Ma)

Stratigraphic Name: Snowcrest Range Group; Madison Group

Lithology: Major:: {13-33m(calcareous mudstone)| 85-125m(limestone, silty limestone, siltstone, shale, calcareous mudstone)| 5-45m(siltstone, sandstone, claystone)| 240-420m(limestone)| 100-230m(limestone, argillaceous limestone)}; Minor:: {13-33m(limestone, calcareous sandstone, calcareous siltstone, limestone-pebble conglomerate, phosphatic claystone)| | 5-45m(limestone solution breccia, evaporite solution breccia)| 240-420m(dolomitic limestone)| 100-230m(shaly limestone, calcareous shale}

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]

Bashkirian - Tournaisian
315.2 - 358.9 Ma



ID: 2950702
Snowcrest Range and Madison Groups; or Snowcrest Range and Tendoy Groups; or Surret Canyon through McGowan Creek Formation: Surrett Canyon, South Creek, Scott Peak, Middle Canyon, and McGowan Creek Formations

Age: Carboniferous (315.2 - 358.9 Ma)

Stratigraphic Name: Snowcrest Range Group; Madison Group; Snowcrest Range; Tendoy Group

Description: Surrett Canyon Formation: Dark gray, massive limestone with much scattered white bioclastic debris. Marine. Thickness at type section 67 m (220 ft). South Creek Formation: Dark gray, thin-bedded, chert bearing limestone that alternates with dark gray, argillaceous limestone. Marine. Thickness at type section 91 m (300 ft). Scott Peak Formation (Msp): Dark gray, chert-bearing, fine grained limestone interbedded with subordinate light brown, calcareous, quartzose siltstone to fine sandstone. Marine. Thickness at type section 685 m (2,247 ft). Middle Canyon Formation (Mmd): Dark gray, silty limestone with chert beds and nodules. Shallow marine. Thickness at type section 335 m (1,100 ft). McGowan Creek Formation: Upper part: dark gray and pale yellowish brown, thin-bedded, calcareous siltstone interbedded with dark gray, silty limestone. Lower part: dark gray, carbonaceous, thin-bedded argillite with interbeds of dark gray siltite, medium gray, fine-grained, conglomeratic sandstone and quartzite, and dark gray, silty limestone. Marine. Thickness as much as 61 m (200 ft).

Lithology: Major:{limestone}, Minor:{siltstone,sandstone,conglomerate sandstone,argillite,metasiltstone, quartzite}, Incidental:{chert}

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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