Marte, Lobo


Main commodities: Au
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Marte & Lobo are un-developed porphyry gold deposits at 4200 m asl in the Maricunga district of Chile (#Location: 27° 10' 19" S, 69° 1' 12" W).

Both are related to small multiphase 14 to 13 Ma diorite porphyry stocks intruded into Late Miocene, partially eroded, stratovolcanoes. These intrusives are part of a linear, calc-alkaline volcanoplutonic arc emplaced during the Mid- to Late-Miocene as eastward directed subduction was shallowing. The basement below the deposits is has undergone cmpresssion with the development of a series of high angle reverse faults. The host horblende-biotite stock at Marte is subdivided into three phases, two mineralised porphyries and a weakly porphyritic, late mineralisation micro-diorite. Much of the latter comprises the matrix of an intrusion breccia which is locally cut by a closely related hydrothermal breccia.

Gold is found in quartz veinlet stockworks that may have been emplaced with K-silicate alteration (as evidenced by remnants of biotite and alkali feldspars) but are now associated with overprinted intermediate argillic sericite-clay assemblages rich in chlorite.   Pyrite is the principal sulphide with traces of chalcopyrite, bornite and molybdenite, while magnetite and hematite are important components. The ore zone contains around 10% each of pyrite and iron oxides. Hematite exceeds magnetite in abundance; both are hypogene in origin. Gypsum after anhydrite commonly exceeds 5% with traces of calcite and tourmaline. The mineralisation and alteration most affected the late stage microdiorite and its breccias. Erosional remnants of the andesitic roof volcanics are replaced by chalcedony and alunite rich advanced argillic alteration assemblages.

The resource has been reported at Marte as 46 Mt @ 1.43 g/t Au and at Lobo 80 Mt @ 1.6 g/t Au. About 20% of these resources underwent supergene oxidation.

Teck Cominco reported the following as of December, 2007 for the Marte-Lobo project:
    indicated mineral resources - 97.68 Mt @ 1.72 g/t Au and
    inferred mineral resources - 9.25 Mt @ 1.56 g/t gold

For more detail see the reference listed below.

The most recent source geological information used to prepare this summary was dated: 1995.    
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.

  References & Additional Information
   Selected References:
Sillitoe R H  1995 - Marte and Lobo, Chile: in Sillitoe R H,  Exploration and Discovery of Base- and Precious-Metal Deposits in the Circum-Pacific Region During the Last 25 Years Metal Mining Agency of Japan    pp 24-25
Sillitoe, R.H.,  1991 - Gold metallogeny of Chile - an introduction: in      Econ. Geol.   v.86, pp. 1187-1205.
Vila T, Sillitoe R H, Betzhold J, Viteri E  1991 - The porphyry gold deposit at Marte, northern Chile: in    Econ. Geol.   v86 pp 1271-1286

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 takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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