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Coolidge Springs deposit, Desert Shores, Imperial Co., California, USA

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Latitude & Longitude (WGS84): 33° 24' 25'' North , 116° 3' 45'' West
Latitude & Longitude (decimal): 33.40722,-116.06250
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BSh : Hot semi-arid (steppe) climate

A limestone deposit located in sec. 7, T9S, R9E, SBM, 2.1 km (1.3 miles) W of Desert Shores and 1.9 km (6,200 feet) NW of Coolidge Springs, on Bureau of Land Management administered land (wilderness land ?). MRDS database stated accuracy for this location is 500 meters. Also located in sections 5, 6, 8 & 17.

A sedimentary deposit hosted in metasedimentary rock, schist. The ore body is bedded, tabular at a thickness of 30.48 meters and a length of 1,219.2 meters. Associated rocks include gneiss. Local rocks include pre-Cenozoic metasedimentary and metavolcanic rocks undivided and/or limestone of probable Paleozoic or Mesozoic age.

Analytical data results: Analysis by Oesterling and Spurk gave: 84-95.5% CaCO3; 1.39-4.7% MgCO3; 0.23-5.81% SiO2; 0.01-0.61% Fe2O3; 0.22-5.67% Al2O3.

Mineral List

1 valid mineral.

Rock Types Recorded

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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

Mesozoic - Paleozoic
66 - 541 Ma

ID: 2736151
Limestone of probable Paleozoic or Mesozoic age

Age: Phanerozoic (66 - 541 Ma)

Stratigraphic Name: Calaveras Complex (part); Gabilan Limestone; Hite Cove Formation (part); Riggs Formation; Sur Series (part)

Description: Limestone, dolomite, and marble whose age is uncertain but probably Paleozoic or Mesozoic

Comments: Deformed and/or metamorphosed carbonate rocks mapped locally throughout State. Includes blocks in melange

Lithology: Major:{limestone,marble}, Minor:{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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.


Morton, P.K. (1977) Mines and mineral resources of Imperial County, California. California Division of Mines and Geology County Report 7, 104 pp.: 66.

Todd, V.R., Kilburn, J.E., Detra, D.E., Griscom, Andrew, Kruse, F.A., and McHugh, E.L. (1987), Mineral Resources of the Jacumba (In-Ko-Pah) Wilderness Study Area, Imperial County, California: USGS Bulletin 1711-D, 18 pp.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10062377 & 10139041.

U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060250403.

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