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Beebe Hole Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA

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Summary:

A 12- to 15-ft-thick pegmatite dike strikes north 22 degrees west, and is exposed intermittently for about 1/2 mile in schist and quartzite. Faulting of the dike has caused the dip to range from 5 degrees to 60 degrees southwest. Pockets within the dike have gem minerals of quartz, goshenite, aquamarine, and kunzite. In addition to gem minerals, minor concentrations of lithiophilite, cassiterite, cleavelandite, columbite/tantalite, black tourmaline (schorl), and mica were observed. Most pockets are filled with montmorillonite clay. Pockets range in size from a few inches to several feet; with three to five pockets commonly occurring within these zones of enrichment.

Workings & Production:

Three adits, each less than 20 feet long, and one open cut. According to Loren Beebe's co-partner Fred Stevens, $500.000 in gem quality kunzite was produced from pockets found between 1974 and 1986. He further stated that several thousand dollars of aquamarine was produced during the early 1980's.

Sample Data:

According to the USGS, it is highly probable that additional gem-bearing pockets will be found in this deposit. No samples were taken in 1986 for analysis. Four zones with multiple pockets within the pegmatite were observed to contain small quantities of gem-quality aquamarine, kunzite, and quartz.



References:
CALIF. STATE MINING BUR. BULLETIN 37, 1905, P. 26-27.

CALIF. STATE MINING BUR. REPORT 14, 1914, P. 703-705.

CALIF. JOUR. MINES AND GEOL., V. 35, 1939, P. 37-38.

CALIF. DIV. MINES AND GEOL. COUNTY REPORT 3, 1963, NO. 6, P. 11.

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.

U.S. BUR. MINES OPEN-FILE REPORT MLA 23-85, 1985, TABLE 1, NO. 6, P. 11.





 Map Reference: 32°43'3"N , 116°13'52"W

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Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
  		•  Albite
    var: Cleavelandite
    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.]
  		•  'Apatite'
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Apatite-(CaF)
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Reference: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
  		•  Beryl
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
    Reference: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
  		•  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.]
  		•  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.]
  		•  Beryl
    var: Morganite
    Reference: [Sinkankas, J. 1997. Gemstones of North America. Vol. 3. Beryl; Tucson, Arizona: Geoscience Press Inc.; pages 59-60, 480pp.]
  		•  Cassiterite
    SnO
     
    2
    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.]
  		•  Columbite
    (Fe,Mn)(Nb,Ta)
     
    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.]
  		•  Herderite
    CaBe[(F,OH)|PO
     
    4
    		]
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Lithiophilite
    LiMn
    2+
     
    		[PO
     
    4
    		]
    Description: Moore (2000) analyzed lithiophilite from this locality and found the Mn/Mn + Fe ratio was 0.56
    Reference: [Mineralogical Record 33(5):363-407; Moore, P. B., 2000, in Mineralogy of Maine, p. 333-336.]
  		•  '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: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, 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: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
  		•  Purpurite
    (Mn
    3+
     
    		,Fe
    3+
     
    		)[PO
     
    4
    		]
    Reference: [Mineralogical Record 33(5):363-407]
  		•  Quartz
    SiO
     
    2
    Reference: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
  		•  Schorl
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
    Reference: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
  		•  Spessartine
    Mn
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
  		•  Spodumene
    LiAl[Si
     
    2
    		O
     
    6
    		]
    Reference: [Fisher, J., 2002, Gem and Rare Element Pegmatites of Southern California, Mineralogical Record 33(5), 363-407. ]
    Site Photo
    Beebe Hole Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  Spodumene
    var: Kunzite
    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
    Beebe Hole Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
    © Rob Lavinsky
  		•  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.]
  		•  'Tourmaline'
    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.]


    24 entries listed. 14 valid minerals.

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