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Tecoma Mine (Old Tecoma Mine), Tecoma Hill, Lucin District, Pilot Range, Box Elder Co., Utah, USA

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Latitude & Longitude (WGS84): 41° 14' 53'' North , 114° 2' 23'' West
Latitude & Longitude (decimal): 41.24806,-114.03972
Köppen climate type:BSk : Cold semi-arid (steppe) climate

A former Pb-Ag-Zn-Fe-Cu-Mo mine located in the SE¼SE¼ sec. 8 and in the SW¼SW¼ sec. 9, T6N, R19W, SLM, on private (patented) land. MRDS database stated accuracy for this location is 100 meters.

Mineralization is hosted in rocks of the Goilmette Formation (limestone, dolomite).

Local Geological Structures: NE-trending fault zone.

Related tectonic structures: Miogeosyncline.

Mineral List

19 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

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary 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]

Hirnantian - Tremadocian
443.8 - 485.4 Ma

ID: 2966472
Ely Springs Dm, Eureka Qtz, Crystal Peak Dm, Watson Ranch Qzt, and the Pogonip Group

Age: Ordovician (443.8 - 485.4 Ma)

Stratigraphic Name: Ely Springs Dolomite; Eureka Quartzite; Crystal Peak Dolomite; Watson Ranch Quartzite; Pogonip Group

Description: Ely Springs Dm, Eureka Qtz, Crystal Peak Dm, Watson Ranch Qzt, and the Pogonip Group (Lehman Formation, Kanosh Shale, Juab, Wah Wah, Fillmore, and House Limestones).

Comments: shallow platform

Lithology: Major:{limestone,siltstone mudstone}, Minor:{sandstone,dolostone}

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

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ryan, G.H. (1914), Geology and Ore Deposits in Lucin Mining District: Salt Lake Min. Rev. 16 (April 30).
Butler, B.S. (1920), Ore Deposits of Utah, USGS Professional Paper 111.
Rocks & Minerals (1949): 24: 363.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1085.
Southern Pacific Railroad (1964): 82.
Bullock, K.C. (1970), (updated 1976), Iron Deposits of Utah, Utah Geological and M. Survey, Bulletin 88: 16-17.
Rocks & Minerals (1990): 65: 18.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10087178 & 10129836.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0490030410.

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