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Damiana, Quebrada M |
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Chile |
| Main commodities:
Cu
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Super Porphyry Cu and Au
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Damiana & Quebrada M are large exotic secondary copper deposits developed to the west and north respectively of the Cerro Indio Muerto, where the El Salvador porphyry copper deposit is located.
Damiana forms a gently west inclined layer covering a surface area of some 3.4x2.2 km. It has an average thickness of 23 m and overburden of 20 m. It is primarily hosted by andesitic volcaniclastics of the early Cretaceous Llanta Formation, with lesser mineralisation in the overlying rhyolitic ash flow tuffs of the Palaeocene to Eocene Indio Muerto Dome and gravel cutting the Miocene pediplain.
The predominant copper minerals are chrysocolla and lesser copper wad, while close to El Salvador thin chalcocite films coats pyrite and turquoise is associated with kaolinitic lenses.
Damiana is reported to contain between 1.2 and 3.5 Mt of contained Cu
At Quebrada M, lateral flow was controlled by a fault zone. Mineralisation is present as an exotic chalcocite deposit where chalcocite films coat a pyrite breccia.
Reserves at Quebrada M in 1991 were 41 Mt @ 0.62% Cu
For more information consult the references below.
The most recent source geological information used to prepare this decription was dated: 1998.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Mote T I, Becker T A, Renne P, Brimhall G H 2001 - Chronology of exotic mineralization at El Salvador, Chile, by 40Ar/39Ar dating of Copper Wad and supergene Alunite: in Econ. Geol. v96 pp 351-366
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Munchmeyer C 1996 - Exotic deposits - products of lateral migration of supergene solutions from copper deposits: in Camus F, Sillitoe R H, Petersen R (Eds), Andean Copper Deposits: New Discoveries, Mineralisation, Styles and Metallogeny Soc. Econ. Geologists Spec. Publ. No. 5 pp 43-58
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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