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Bristol Dry Lake pit [1] (National Chloride Co. of America; National Chloride Co. salt evaporator; Hollar Chemical Co.; Saline Products Co.; Bristol Dry Lake), Saltus, San Bernardino Co., California, USA

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Latitude & Longitude (WGS84): 34° 29' 35'' North , 115° 42' 33'' West
Latitude & Longitude (decimal): 34.49306,-115.70944
Köppen climate type:BWk : Cold desert climate

A lacustrine Ca-gypsum-halite-Sr deposit/mine located in 27, T5N, R12E, SBM, 5.3 km (3.3 miles) SSW of Saltus, on the dry lake, on federal land (federal lease/located claim). Owned & operated by the Leslie Salt Company (100%), Clifornia (1990). MRDS database stated accuracy for this location is .

NOTE in USGS MRDS database file: Although the calcium and sodium chloride, gypsum and celestite (Sr) occurrences are spread over different localities, Bristol Dry Lake is treated as one mineral locality, zoned with respect to concentration of brines and evaporites.

NOTE: The geographic coordinates presented in the USGS MRDS database file (34.57502, -115.72054), are in error and place this locality N of Amboy and far from the dry lake. The geographic coordinates presented in this Mindat file are the coordinates of record for sec. 27, this township and place the locality at the commercial salt harvesting operations.

Local rocks include Quaternary alluvium and marine deposits.

Workings include unspecified surface and underground openings (surface salt evaporators are prominent on the topo map).

Mineral List

6 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

Holocene - Pliocene
0 - 5.333 Ma

ID: 2885167
Quaternary alluvium and marine deposits

Age: Cenozoic (0 - 5.333 Ma)

Stratigraphic Name: Temescal Formation; Modesto Formation; Victor Formation; Alameda Formation; Aromas Red Sands; Bautista Beds; Brawley Formation; Borrego Formation; Burnt Canyon Breccia; Cabezon Fanglomerate; Campus Formation; Casitas Formation; Chemehuevi Formation; Corcoran Clay; Cushenbury Springs Formation; Dos Picachos Gravels; Dripping Springs Formation; Frazier Mountain Formation; Friant Formation; Harold Formation; Heights Fanglomerate; Hookton Formation (part); Huichica Formation; La Habra Formation; Manix Lake Beds; Mohawk Lake Beds; Montezuma Formation; Nadeau Gravel; Ocotillo Conglomerate; Orcutt Formation; Pacoima Formation; Pauba Formation; Peckham Formation; Pinto Formation; Resting Springs Formation; Riverbank Formation; Rohnerville Formation; San Dimas Formation; Shoemaker Gravel; Temecula Arkose; Battery Formation; Bay Point Formation; Colma Formation; Lindavista Formation; Lomita Marl; Merritt Sand; Millerton Formation; Palos Verdes Sand; San Pedro Formation; Sweitzer Formation; Timms Point Silt

Description: Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.

Lithology: Major:{coarse alluvium}, Minor:{fine alluvium}

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.


Hess, Frank L. (1910), A reconnaissance of the gypsum deposits of California, with a note on errors I the chemical analysis of gypsum by George Steiger: USGS Bulletin 413, 37 pp.: 25-27.

Cloudman, H.C., F.J.H. Merrill & E. Huguenin (1919), San Bernardino County: California Mining Bureau. Report 15: 15: 774-899; […(abstract): Geol. Zentralbl., Band 27: 394]: 897.

Hess, Frank L. (1920), Gypsum deposits of California, in Stone, R.W., Gypsum deposits of the United States: USGS Bulletin 697: 58-86.

Tucker, W. Burling (1921), Los Angeles field division: California Journal of Mines and Geology, California Mining Bureau. (Report 17): 17: 263-390.

Newman, M.A. (1922), Nonmetallic minerals of southern California: California Mining Bureau. Report 18: 18: 611-618.

Foshag, William Frederick (1926), Saline Lakes of the Mojave Region, Economic Geology: 21(1): 56-64.

Tucker, W. Burling & Reid J. Sampson (1930), Los Angeles field division: California Journal of Mines and Geology, California Mining Bureau. (Report 26): 26: 202-325.

Tucker, W. Burling & Reid J. Sampson (1931), Los Angeles Field Division; 27th Report of the State Mineralogist; San Bernardino County: California Journal of Mines and Geology, California Mining Bureau. (Report 27): 27: 262-401.

Hewett, Donnel Foster, et al (1936), Mineral resources of the region around Boulder Dam: USGS Bulletin 871, 323 pp.

Tucker, W. Burling & Reid J. Sampson (1943b), Mineral resources of San Bernardino County: California Division Mines Report 39: 540.

King, C.R. (1948), California Journal of Mines and Geology, California Division Mines (Report 44): 44(2): 189-200

Ver Planck, Wm. E., Jr. (1950), Strontium in California. California Division of Mines Bulletin 156: 270-273.

Gale, Hoyt Stoddard (1951), Geology of the saline deposits Bristol dry lake, San Bernardino County, California: California Division Mines Special Report 13: 6-10.

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: 418.

Ver Planck, Wm. E., Jr. (1952), Gypsum in California: California Division Mines Bulletin 163: 47-48.

Durrell, C. (1953) Geological investigations of strontium deposits in southern California. California Division Mines Special Report 32, 48 pp.: 9-14.

Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology: 49(1-2): 227-228.

Ver Planck, W.E. (1957), Magnesium and Magnesium Compounds, California Division of Mines and Geology Bulletin 176: 475-482 (Cadiz Dry Lake): 475-482.

Ver Planck, Wm. E., Jr. (1958), Salt in California: California Division Mines Bulletin 175, 168 pp: 23-25.

Bassett, A.M., D.H. Kupfer & F.C. Barstow (1959), Core logs from Bristol, Cadiz and Danby Dry Lakes, San Bernardino County, California: USGS Bulletin 1045-D: 105.

Schreck, A.E. and Arundale, J.C. (1959): U.S. Bureau of Mines Information Circular IC-7933: 17.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 123.

Dunning, G.E. and J.F. Cooper (1969b) A second occurrence of antarcticite from Bristol Dry Lake, California. American Mineralogist: 54: 1018-1021.

Muehle, G.H. (1971) Antarcticite from California. Mineralogical Record: 2: 171-172.

Calzia, J.P. et al (1979), Leaseable Mineral Resources of the California Desert Conservation Area: USGS Administrative Report prepared on behalf of the Bureau of Land Management, California Desert Plan Staff, Riverside, California: 122-128.

Calzia, J.P. and Moore, S.W. (1980), Geophysical, Lithhlogic and Water-Quality Data from Bristol Dry Lake, San Bernardino County, Conservation Division, Menlo Park, 2 unpublished sheets.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 192 (map 5-3), 193, 287, 288-290.

California Division of Mines and Geology (1990), Mines and mineral producers active in California (1988-89), California Department of Conservation, Division of Mines and Geology, Special Publication 103.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10262540.

Ansermet, S. (2011): Aus dem Salzsee in Kühlschrank: Antarcticit vom Bristol Dry Lake, Kalifornien, USA. Lapis: 36 (11): 33-36.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #006071

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