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Mariposa Mine (California Mountain Mine), Terlingua District, Brewster Co., Texas, USA

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Latitude & Longitude (WGS84): 29° 19' 5'' North , 103° 41' 39'' West
Latitude & Longitude (decimal): 29.3180555556, -103.694166667

Second largest mercury producer in district.

Mineral List

Mineral list contains entries from the region specified including sub-localities

24 valid minerals. 3 (TL) - type locality of valid minerals.

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

Late Cretaceous
66 - 100.5 Ma
Buda Limestone and Del Rio Clay, undivided

Age: Late Cretaceous (66 - 100.5 Ma)

Stratigraphic Name: Buda Limestone; Del Rio Clay

Description: Buda Limestone and Del Rio Clay, undivided; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.

Comments: In Eastern part of Trans-Pecos and High Plains-Buda Ls--Limestone, fine grained, bioclastic, commonly glauconitic, pyrite, hard, massive lt gray to pale orange; formation is as much as 45 ft thick. Del Rio Clay--Clay, calcar. to gypsiferous, pyrite common, blocky, med gray, weathers lt gray to lt yell-gray, contains lenses of calcar siltst., marine megafossils include abdt Exogyra arietina and other pelecypods; thickness 40-70 ft. In Western part of Trans-Pecos Texas- Buda Ls--upper part-- thin to thick beds, resistant, few chert nodules; middle--interbedded gray ls, marl, and calc shale, limonite nodules; lower--fossilif., aphanitic ls, thin to thick beds; formation is 200-350 ft thick. Del Rio Clay--lt gray to lt yell-gray marl interbedded with clayey lt gray, nodular ls. thickness 87 ft.

Lithology: Major:{limestone}, Minor:{marlstone,claystone}, Incidental:{siltstone, shale}

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, used under Creative Commons Attribution 4.0 License

Localities in this Region

  • Texas
    • Brewster Co.
      • Terlingua District
        • Mariposa Mine (California Mountain Mine)

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Yates, R.G. and Thompson, G.A. (1944) The Mariposa mine, Terlingua quicksilver district, Brewster County, Texas. USGS Open-File Report 44-75.

Tunell, G., Fahey, J.J., Daugherty, F.W., Gibbs, G.V. (1977) Gianellaite, a new mercury mineral. Neues Jahrbuch für Mineralogie, Monatshefte, 119-131.

Roberts, A.C., Ansell, H.G. and Dunn, P.J. (1981) Comancheite, a new mercury oxychloride-bromide from Terlingua, Texas. Canadian Mineralogist, 19, 393-396.

Smith, A.E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66:196.

Roberts, A.C., Gault, R.A., Paar, W.H., Cooper, M.A., Hawthorne, F.C., Burns, P.C., Cisneros, S. and Foord, E.E. (2005) Terlinguacreekite, Hg2+3O2Cl2, a new mineral species from the Perry Pit, Mariposa mine, Terlingua mining district, Brewster County, Texas, U.S.A. Canadian Mineralogist 43:1055-1060.

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