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Coedmore quarries (Coedmore quarry), Bellair, Durban, KwaZulu-Natal Province, South Africa

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Located in portion "Natcem" of Bellair 823, Bellair, Durban.
Co-ordinates: 29deg. 52'S, 30deg. 52'E.

A narrow, eastward-dipping, Phanerozoic dolerite sill (Stormberg series, Karroo System) has been intruded into sandstone (Natal series, Cape System). Pockets and narrow fissures in the dolerite host crystallised minerals (prehnite, epidote, apophyllite, quartz, calcite). A series of near-vertical NE/SW-trending fissure-breccia zones are developed in the sandstone, and these host cabonate assemblages (calcite, siderite, with minor quartz, barite, goethite pyrite,and much white clay). Operations began in 1928 and the quarry is still being actively worked.
A second pit on the property works tillite (Dwyka series, Karroo system).

Refs.:
Heron, H.D.C. (2004). Apophyllite-bearing assemblages in brecciated dolerite boulders at Coedmore Quarries, Durban, Natal. Micro News and Views, 30(3): 2-6 and 31(1): 4-9.
For details on minerals listed in unpublished reports see also http://www.mindat.org/mesg-7-51966.html





Mineral List:
  		•  'Apophyllite'
    Reference: [Heron, H.D.C. (1972). Coedmore Quarries. July newsletter of the Natal Mineral and Gem Society; Heron, H.D.C. (1996a). The occurrence of apophyllite at five KwaZulu-Natal localities. Micro News & Views, 23(1): 3-6; Heron, H.D.C. (2004). Apophyllite-bearing assemblages in brecciated dolerite boulders at Coedmore Quarries, Durban, Natal. Micro News and Views, 30(3): 2-6 and 31(1): 4-9.]
  		•  Baryte
    BaSO
     
    4
    Reference: [Heron, H.D.C. (1992). The mineralogy of cavities associated with Fissure-3 quartzite breccia on level 5 at Coedmore Quarries,Durban. Unpublished report for the Quarry Management; Heron, H.D.C. (1996). A partially leached barite-bearing assemblage in a boulder derived from Fissure 4 on level 4 at Coedmore Quarries, Durban. Unpublished report for the Quarry Management., Heron, H.D.C. (in prep.) Barite occurrences at Coedmore Quarries, Durban, Natal. Unpublished report for the Quarry Management.]
  		•  Calcite
    CaCO
     
    3
    Reference: [Heron, H.D.C. (1972). Coedmore Quarries. July newsletter of the Natal Mineral and Gem Society; Heron, H.D.C. (1991). Calcite-siderite assemblages in quartzite boulders from Coedmore Quarries, Durban. Unpublished report for the Quarry Management; Heron, H.D.C. (2003). Scalenohedral calcite occurrences in the dolerite sill at Coedmore Quarries, Durban, Natal.]
  		•  'Chabazite'
    Reference: [ Tschernich, R. (1992): Zeolites of the World.]
  		•  Chabazite-Ca
    (Ca,K
     
    2
    		,Na
     
    2
    		)
     
    2
    		[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		]
     
    2
    		 · 12H
     
    2
    		O
    Reference: [Heron, H.D.C. (2001). A unique zeolite-bearing prehnite-assemblage sample from the dolerite sill at Coedmore Quarries, Durban. Unpublished report for the Quarry Management.]
  		•  'Chlorite Group'
    Reference: [Heron, H.D.C. (1996). A partially leached barite-bearing assemblage in a boulder derived from Fissure 4 on level 4 at Coedmore Quarries, Durban. Unpublished report for the Quarry Management. Heron, H.D.C. (in prep.) Barite occurrences at Coedmore Quarries, Durban, Natal. Unpublished report for the Quarry Management.]
  		•  Copiapite ?
    Fe
    2+
     
    		Fe
    3+
    4
    		[OH|(SO
     
    4
    		)
     
    3
    		]
     
    2
    		 · 20H
     
    2
    		O
    Description: Possibly ferricopiapite.
    Reference: [Hugh Heron collection]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [Heron, H.D.C. (1972). Coedmore Quarries. July newsletter of the Natal Mineral and Gem Society; Heron, H.D.C. (2004). Apophyllite-bearing assemblages in brecciated dolerite boulders at Coedmore Quarries, Durban, Natal. Micro News and Views, 30(3): 2-6 and 31(1): 4-9; Heron, H.D.C. (2001). A unique zeolite-bearing prehnite-assemblage sample from the dolerite sill at Coedmore Quarries, Durban. Unpublished report for the Quarry Management.]
  		•  Goethite
    α-Fe
    3+
     
    		O(OH)
    Reference: [Heron, H.D.C. (1991). Calcite-siderite assemblages in quartzite boulders from Coedmore Quarries, Durban. Unpublished report for the Quarry Management. ]
  		•  Gypsum
    Ca[SO
     
    4
    		] · 2H
     
    2
    		O
    Reference: [Heron, H.D.C. (2001). Gypsum occurrences at four tillite quarries of coastal Natal. Micro News & Views, 27(2): 11-15. [Reprinted in S.A. Lapidary Magazine, 33(2): 11-18.] ]
  		•  Kaolinite ?
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    Reference: [Heron, H.D.C. (1991). Calcite-siderite assemblages in quartzite boulders from Coedmore Quarries, Durban. Unpublished report for the Quarry Management. ]
  		•  Laumontite
    CaAl
     
    2
    		Si
     
    4
    		O
     
    12
    		·4H
     
    2
    		O
    Reference: [Heron, H.D.C. (2001). A unique zeolite-bearing prehnite-assemblage sample from the dolerite sill at Coedmore Quarries, Durban. Unpublished report for the Quarry Management.]
  		•  Limonite
    FeO(OH)·nH
     
    2
    		O
    Reference: [Heron, H.D.C. (1996). A partially leached barite-bearing assemblage in a boulder derived from Fissure 4 on level 4 at Coedmore Quarries, Durban. Unpublished report for the Quarry Management.]
  		•  'Manganese Oxides
    var: Manganese Dendrites'
    Reference: [Heron, H.D.C. (1990/1991). A note on manganese dendrite and oxide masses from selected Natal localities. Micro News and Views, 17(1):2-6 and 17(2):2-4); Heron, H.D.C. (1996). Leached assemblages in dolerite boulders from level 3 NE at Coedmore Quarries, Durban. Unpublished report for the Quarry Management.]
  		•  Montmorillonite
    (Na,Ca)
     
    0.33
    		(Al,Mg)
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    Reference: [Pers. comm. of company geologist to Hugh Heron]
  		•  'Phillipsite'
    Reference: [Tschernich, R.W. (1992). Zeolites of the World. Geoscience Press Inc.: Phoenix. ]
  		•  Phillipsite-Ca
    (Ca
     
    0.5
    		,K,Na,Ba
     
    0.5
    		)
     
    4-7
    		[Al
     
    4-7
    		Si
     
    12-9
    		O
     
    32
    .
     
    		 12H2O
    Reference: [Heron, H.D.C. (2001). A unique zeolite-bearing prehnite-assemblage sample from the dolerite sill at Coedmore Quarries, Durban. Unpublished report for the Quarry Management.]
  		•  Prehnite
    Ca
     
    2
    		Al
     
    2
    		Si
     
    3
    		O
     
    12
    		(OH)
    Reference: [Cairncross, B. & Dixon, R. (1995). Minerals of South Africa. Geological Society of South Africa: Linden; Heron, H.D.C. (1972). Coedmore Quarries. July newsletter of the Natal Mineral and Gem Society; Heron, H.D.C. (1996b). Polyhedral prehnite from Coedmore Quarries, Durban. Micro News and Views,23(2); Heron, H.D.C. (2004). Apophyllite-bearing assemblages in brecciated dolerite boulders at Coedmore Quarries, Durban, Natal. Micro News and Views, 30(3): 2-6 and 31(1): 4-9; Heron, H.D.C. (2001). A unique zeolite-bearing prehnite-assemblage sample from the dolerite sill at Coedmore Quarries, Durban. Unpublished report for the Quarry Management.]
  		•  Pyrite
    FeS
     
    2
    Reference: [Heron, H.D.C. (1972). Coedmore Quarries. July newsletter of the Natal Mineral and Gem Society. ]
  		•  Quartz
    SiO
     
    2
    Reference: [Heron, H.D.C. (1972). Coedmore Quarries. July newsletter of the Natal Mineral and Gem Society; Heron, H.D.C. (2004). Apophyllite-bearing assemblages in brecciated dolerite boulders at Coedmore Quarries, Durban, Natal. Micro News and Views, 30(3): 2-6 and 31(1): 4-9.]
  		•  Siderite
    FeCO
     
    3
    Reference: [Heron, H.D.C. (1991). Calcite-siderite assemblages in quartzite boulders from Coedmore Quarries, Durban. Unpublished report for the Quarry Management. ]


    21 entries listed. 15 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Durban, KwaZulu-Natal Province, South Africa 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: 16th Nov 2009 08:31:44