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Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA

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Ref.: Rocks & Minerals: 18: 207.

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).

Rocks & Minerals: 60: 117.

A beryl mine located in sec. 7, T.4S., R.4E., at Fourmile, SW of Custer. Operated chiefly in the 1940's (WWII).

Mineralization is an irregular, oval, zoned pegmatite body in quartz-mica schist.

Workings include a large open cut.





 Map Reference: 43°42'46"N , 103°41'49"W

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Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Alluaudite
    (Na,Ca)Mn
    2+
     
    		(Fe
    3+
     
    		,Mn
    2+
     
    		,Fe
    2+
     
    		,Mg)
     
    2
    		(PO
     
    4
    		)
     
    3
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Apatite-(CaF)
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Bertrandite
    Be
     
    4
    		[(OH)
     
    2
    		|Si
     
    2
    		O
     
    7
    		]
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Beryl
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).]
  		•  Biotite
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Cassiterite
    SnO
     
    2
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Childrenite
    (Fe
    2+
     
    		,Mn
    2+
     
    		)Al[(OH)
     
    2
    		|PO
     
    4
    		] · H
     
    2
    		O
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  'Columbite-Tantalite'
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).]
  		•  Eucryptite ?
    LiAl[SiO
     
    4
    		]
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Heterosite
    (Fe
    3+
     
    		,Mn
    3+
     
    		)[PO
     
    4
    		]
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Ixiolite
    (Ta,Nb,Sn,Fe,Mn)
     
    4
    		O
     
    8
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  'Jahnsite'
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Microcline
    K[AlSi
     
    3
    		O
     
    8
    		]
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Opal
    SiO
     
    2
    		·nH
     
    2
    		O
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Opal
    var: Opal-AN
    SiO
     
    2
    		·nH
     
    2
    		O
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Quartz
    SiO
     
    2
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Schorl
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]
  		•  Sicklerite
    (LiMn
    2+
     
    		,Fe
    3+
     
    		)[PO
     
    4
    		]
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Spodumene
    LiAl[Si
     
    2
    		O
     
    6
    		]
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).]
  		•  Spodumene
    var: Hiddenite
    Reference: [SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"]
  		•  Tantalite
    (Fe,Mn)(Ta,Nb)
     
    2
    		O
     
    6
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Triphylite
    LiFe
    2+
     
    		[PO
     
    4
    		]
    Reference: [Rocks & Minerals: 75(3): 156-169.]
  		•  Vivianite
    Fe
    2+
    3
    		(PO
     
    4
    		)
     
    2
    		·8H
     
    2
    		O
    Description: Occurs in pegmatite.
    Reference: [Rocks & Minerals: 60: 117.]


    25 entries listed. 19 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in South Dakota, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the 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 hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 13:39:40