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Tin Mountain Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
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Latitude: 43°44'49"N
Longitude: 103°43'14"W
 
 
An Li-Cs-Be-niobium-tantalum-mica-quartz mine in pegmatite located in secs. 35, 36, T.3S., R.3E., at Fourmile near Custer.

Mineralization is an irregular, L-shaped, zoned pegmatite body in schist.

Workings include 12 open cuts, 2 tunnels and a shaft with 2 levels and stopes.

Mineral List

Albite
var: Andesine
Almandine
Amblygonite
Aurichalcite
Autunite
Azurite
Beryl
var: Morganite
'Biotite'
Bismuth
Bismuthinite
Bornite
Calcite
Cassiterite
Chalcopyrite
'Chlorite Group'
'Columbite-Tantalite'
Cookeite
Covellite
Dawsonite
Ferrisicklerite
Fluorapatite
Fourmarierite
Goethite
Hemimorphite
Hydrozincite
Kaolinite
Kasolite
Lepidolite
'Limonite'
Löllingite
Magnetite
Malachite
Meta-autunite
Microcline
Microlite Group
Montebrasite
Montmorillonite
Muscovite
Pollucite
Pyrolusite
Quartz
var: Smoky Quartz
Schorl
Siderite
Smithsonite
Sphalerite
Spodumene
var: Kunzite
'Tantalite'
Triphylite
Turquoise ?
Uraninite
Uranophane
Vandendriesscheite
Xenotime-(Y)
Zircon


58 entries listed. 49 valid minerals.

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References

Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, U.S. Bureau of Mines Information Circular 8298: 32 (Table A-1).

Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.

Rocks & Minerals: 60: 117-118.

Staatz, M. H.; Page, L. R.; Norton, J. J.; Wilmarth, V. R. (1963) Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota. USGS Prof. Paper 297C.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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