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Corkscrew Canyon Mine (Corkscrew Mine), Ryan, Furnace Creek District (Furnace Creek Borate District; Death Valley Area Borate Deposits; Ryan area), Inyo Co., California, USA

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Latitude & Longitude (WGS84): 36° 22' 40'' North , 116° 45' 36'' West
Latitude & Longitude (decimal): 36.3777777778, -116.76
Other regions containing this locality:Death Valley National Park, California/Nevada, USA

A former borate mine located in the center N½ sec. 21, T26N, R2E, SBM, 10.1 km (6.3 miles) NW of Ryan, in Furnace Creek Wash at the mouth of Corkscrew Canyon, E flank of the Black Mountains, on National Park Service wilderness land (Death Valley National Park/Death Valley Wilderness). Owned by the U.S. Borax and Chemical Co. (1976). MRDS database stated accuracy for this location is 1,000 meters.

The entrance to this site is through a locked gate east on Route 190 about 1-1/4 miles beyond the exit road from Twenty-Mule-Team Canyon. Mine workings found here alongside a wash consisted of several adits, a huge wooden four-chute ore bin, and an adjacent platform loading area. Activity here was all underground.Greene, 1981

Mineralization is a Miocene borate deposit (Mineral occurrence model information: Model code: 260; USGS model code 35b.3; Deposit model name: lacustrine borates), hosted in rocks of the Furnace Creek Formation (mudstone, shale, sandstone, limestone). The ore body is 548.64 meters long and has a depth-to-top of 0.0 meters. The borate-bearing zone is about 1,800 feet long. The colemanite is massive and cavernous. Basalt occurs in the footwall; tuffaceous mudstone and sandstone occur in the hanging wall. Local rocks include Tertiary nonmarine rocks, undivided.

Workings include unspecified underground workings.

Reserve-Resource data are found in: Evans, James R., G.C. Taylor, and J.S. Rapp (1976).

Reserves and resources data: Type: in-situ: Estimate year: 1976; total resources: 172,000 metric tons of ore.

Assay results: B2O3: 31 weight per cent B (1976). 50% of these reserves were considered to be recoverable.

Mineral List

10 valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

The above list 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.


Schaller, Waldemar Theodore (1916b), Inyoite and meyerhofferite, two new calcium borates: USGS Bulletin 610: 35.

Christ, C.L. & J.R. Clark (1960), X-ray crystallography and crystal chemistry of gowerite, CaO-3B2O3-5H2O: American Mineralogist: 45: 230-234.

Erd, R.C., J.F. McAllister & A.C. Vlisidis (1961), Nobleite, another new hydrous calcium borate from the Death Valley region, California: American Mineralogist: 46: 560-571.

McAllister, James Franklin (1961), Sborgite in the Furnace Creek area, California: USGS PP 424-B, Article 129: B299-B301.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 228, 280.

Erd, R.C., J.F. McAllister, and A.C. Vlisidis (1970) Wardsmithite 5CaO • MgO •12B2O3 •30H2O, a new borate mineral from the Death Valley region, California. American Mineralogist: 55: 350.

McAllister, James Franklin (1970) Geology of the Furnace Creek borate area, Death Valley, Inyo County, California. California Division of Mines and Geology Map Sheet 14, 9 pp.: 9.

Konnert, J.A., Clark, J.R., and Christ, C.L. (1972) Gowerite, CaB5O8(OH) •B(OH)3•3H2O: crystal structure and comparison with related borates. American Mineralogist: 57: 381-396.

Muehle, G. (1974): Colemanite pseudomorphs from the Corkscrew mine, Death Valley, California. Mineralogical Record 5, 174-177.

Evans, James R., G.C. Taylor, and J.S. Rapp (1976) Mines and mineral deposits in Death Valley National Monument. California Division Mines and Geology Special Report 125: 1-61: 28.

Greene, Linda I. (1981), U.S. National Park Service, Historic Preservation Branch, Pacific Northwest/Western Team, Denver Service Center, Death Valley – Historic Resource Study – A History of Mining, Volume I (Parts 1 and 2): part 2: III. E.2.b)(23).

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 238, 246, 252.

Orris, G. (1990) estimate of ore reserves based on published data in 1990.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10023434 & 10212511.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060271264.

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