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Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA

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Summary:

Several 10- to 20-foot-thick pegmatite dikes trend north 6 degrees west, dip 65 degrees west, and extend as far as one-half mile in schist and quartzite. Pegmatite pockets contain microcline, green mica, black tourmaline (schorl), columbite/tantalite, gem-grade beryl (goshenite and aquamarine), apatite, red garnet (spessartite), and quartz. Most pockets are filled with montmorillonite clay and range in size from a few inches to several feet.

Workings & Production:

Eight open cuts. According to the claimant in 1986, several specimens of aquamarine and garnet have been sold.

Sample Data:

One random chip sample of green mica contained 6.1 percent potassium, 0.15 percent fluorine, 0.00069 percent beryllium, 0.028 percent lithium, 0.016 percent magnesium, and 0.055 percent manganese. Pockets within the pegmatite were observed to contain several indicator minerals of gem-bearing zones.



References:
Todd, V. R. et al. 1987. Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.





 Map Reference: 32°43'2"N , 116°13'50"W

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Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Mineralogical Record 33(5):363-407]
  		•  'Apatite'
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Beryl
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © 2003, Jesse Fisher
  		•  Beryl
    var: Aquamarine
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
    Reference: [Todd, V. R. et al. 1987. Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Beryl
    var: Goshenite
    Reference: [Todd, V. R. et al. 1987. Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.]
  		•  Cassiterite
    SnO
     
    2
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Columbite
    (Fe,Mn)(Nb,Ta)
     
    2
    		O
     
    6
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Danburite
    CaB
     
    2
    		Si
     
    2
    		O
     
    8
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Eosphorite
    (Mn
    2+
     
    		,Fe
    2+
     
    		)Al[(OH)
     
    2
    		|PO
     
    4
    		] · H
     
    2
    		O
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Frondelite
    Mn
    2+
     
    		Fe
    3+
    4
    		[(OH)
     
    5
    		|(PO
     
    4
    		)
     
    3
    		]
    Reference: [Mineralogical Record 33(5):363-407]
  		•  'Garnet Group'
    X
     
    3
    		Z
     
    2
    		(TO
     
    4
    		)
     
    3
    		 (X = Ca, Fe, etc·, Z = Al, Cr, etc·, T = Si, As, V)
    Reference: [Todd, V. R. et al. 1987. Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.]
  		•  Helvite
    Mn
    2+
    4
    		Be
     
    3
    		[S|(SiO
     
    4
    		)
     
    3
    		]
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Herderite
    CaBe[(F,OH)|PO
     
    4
    		]
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Hureaulite
    (Mn,Fe)
     
    5
    		(PO
     
    3
    		OH)
     
    2
    		(PO
     
    4
    		)
     
    2
    		·4H
     
    2
    		O
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Lithiophilite
    LiMn
    2+
     
    		[PO
     
    4
    		]
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Joseph A. Freilich
  		•  'Mica Group'
    Reference: [Todd, V. R. et al. 1987. Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.]
  		•  Microcline
    K[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Mitridatite
    Ca
     
    2
    		Fe
    3+
    3
    		[O
     
    2
    		|(PO
     
    4
    		)
     
    3
    		] · 3H
     
    2
    		O
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Montmorillonite
    (Na,Ca)
     
    0.33
    		(Al,Mg)
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    Reference: [Todd, V. R. et al. 1987. Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.]
  		•  Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Phosphosiderite
    FePO
     
    4
    		·2H
     
    2
    		O
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Purpurite
    (Mn
    3+
     
    		,Fe
    3+
     
    		)[PO
     
    4
    		]
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Quartz
    SiO
     
    2
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Robertsite
    Ca
     
    3
    		Mn
    3+
    4
    		[(OH)
     
    3
    		|(PO
     
    4
    		)
     
    2
    		]
     
    2
    		 · 3H
     
    2
    		O
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Schorl
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Spessartine
    Mn
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [Mineralogical Record 33(5):363-407]
    Site Photo
    Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © 2003 SLR
  		•  Spodumene
    var: Kunzite
    Reference: [Journal of Pegmatology v. 1, no. 1. (2002)]
  		•  Strengite
    FePO
     
    4
    		·2H
     
    2
    		O
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Tantalite
    (Fe,Mn)(Ta,Nb)
     
    2
    		O
     
    6
    Reference: [Todd, V. R. et al. 1987. Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.]


    29 entries listed. 21 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in California, 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: 23rd Nov 2009 09:15:43