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Peschansk |
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Russia |
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Fe Cu
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Super Porphyry Cu and Au
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The Peschan'sk skarn iron deposit is located to the south of Serov in the Yekaterinburg (ex-Sverdlovsk) district, east of the Urals Mountains, in Russia.
The deposit is divided into four separate sectors, occurring on the western margin of the Peschan'sk diorite massif, which is in turn the north-western section of a larger intrusive complex. The intrusives, which are assumed to be of Permo-Carboniferous age, cut lower Devonian sedimentary and volcano-sedimentary rocks. The Devonian sequence comprises limestone at the base, overlain by tuffaceous sandstone, tuffaceous shale and tuffs of andesitic porphyry with bands of limestone. In the upper sections of the succession there are hornblende-plagioclase porphyries, and their tuffs, with subordinate tuffaceous sandstone (Smirnov, 1977).
The lower Devonian sedimentary and volcano-sedimentary sequence dips gently at 5 to 50°, cut by the steep contact with the diorite intrusion. Numerous mafic dykes cut both the intrusive and the layered Devonian sequence, which have been strongly disrupted by block faulting (Smirnov, 1977).
Seventeen ore segregations have been outlined, six of which embody the mineable reserves. The remainder are too small to exploit. The principal bodies are several hundred metres in length and width, with thicknesses of 40 to 80 m. The ore blocks are surrounded by an aureole of strong metasomatic alteration, comprising skarn development over widths of 30 to 120 m, occasionally 200 to 500 m. Albitisation has been developed in the volcanogenic rocks, accompanied by epidotisation, chloritisation and carbonatisation. Epidosites are usually restricted to fault zones, with minor associated veinlets of Cu-sulphides (Smirnov, 1977).
The ore comprises magnetite, sulphide-magnetite and skarn-magnetite varieties. The average content varies from 48.5 to 54% Fe; 2 to 3% S; and 0.037% P. One of the four subdivisions, the Western Peschan'sk, contains chalcopyrite and has an average grade of 0.61% Cu. The magnetite reserves at Peschan'sk were originally around 200Mt (Smirnov, 1977).
The most recent source geological information used to prepare this decription was dated: 1977.
This description is a summary from published sources, the chief of which are listed below.
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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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