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Casa de Pedra |
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Minas Gerais, Brazil |
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Fe
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Casa de Pedra mine is located some 55 km to the south of the centre of Belo Horizonte and 110 km south-west of the Itabira Mine Complex (#Location: 20° 28' 16"S, 43° 55' 15"W).
For detail of the regional setting, geology and stratigraphy of the host sequence and district see the Quadrilatero Ferrifero Iron Province
The deposit is developed on high grade ore within the Cauê Itabirite of the Minas Supergroup Itabira Formation. It is located near the southern extremity of the tight, complex, thrust bounded and reclined Moeda Synform which has been influenced by at least four deformational events, near where that synform wraps around the basement Bação Complex and changes trend from north-south to ESE to become the Dom Bosco Synform. It also lies in the transition between the eastern high strain and westen low-strain domains of the Quadrilatero Ferrifero province.
The deposit occurs as two principal NW-SE trending lenses, comprising the Main and Western deposits. These two deposits have differences in mineralogy and texture due to structural influences. The Main orebody is composed of granular hematite and magnetite with a porosity averaging ~20%, compared to the West orebody which is richer in specularite and goethite, with a porosity averaging ~17%.
The mine is owned by Cia. Siderurgica Nacional (CSN), the largest integrated steel maker in South America, and is that company's main source of ore for its steel works, with any excess production being taken by CVRD/Vale. The mine has a nominal capacity of 12.7 Mt of ore per annum, although in 2001 it produced a total of 7.16 Mt, 25% of which was lump ore, the remainder being mainly sinter feed.
As of 31 December, 2021, remaining Proved + Probable Ore Reserves at a cut-off of 23.37% Fe, were: 2.078 Gt @ 41.17% Fe.
The most recent source geological information used to prepare this decription was dated: 2002.
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.
Casa de Pedra
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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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