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The Goroblagodat skarn iron deposit is located between Yekaterinburg and Serov,to the east of the Urals Mountains in Russia. It occurs at the discordant contact between a possibly Permo-Carboniferous diorite-syenite massif and the Silurian Tura Group sediments and volcanics (Smirnov, 1977).

The ore is contained within a 550 m thick complex of late Silurian porphyries and tuffaceous conglomerate, tuffaceous sandstone and tuffaceous siltstone. In the southern part of the deposit the layered rocks are discordantly cut and partly assimilated by a diorite-syenite intrusive. Near the intrusion the surrounding rocks have been subjected to contact-metasomatic alteration, resulting in garnet and pyroxene-garnet skarns, magnetite skarns, 'variolitic' ores and scapolite rocks (Smirnov, 1977).

The ore related metasomatism has been most strongly developed in the immediate exo-contact and in adjacent pre-ore fracturing zones leading from the contact. The largest ore segregations are in these zones. Some fifteen orebodies have been recognised, spatially associated with zones of skarn formation or scapolitisation. Three of the orebodies are stratabound. These range from 200 to 930 m in length, 2 to 84 m in thickness and extend down dip for 530 to 1600 m. They are conformable, layer like, and less frequently, lensoid. The ore is found within the middle of the skarn, which occupies a considerably greater volume than does the ore (Smirnov, 1977).

Two types of ore are recognised, namely:
i). Skarn - characterised by garnet-magnetite, garnet-epidote-magnetite, and by a trace of Mn within the magnetite;
ii). Variolitic ore - which is subordinate, has a paragenesis of orthoclase-pyroxene-scapolite-magnetite and the presence in the magnetite of traces of vanadium and titanium. The variolitic ores are associated with the mafic dykes that are formed in the area (Smirnov, 1977).

The magnetite ores contain massive, streaky, segregated and banded types, with the principal minerals being, magnetite, garnet, pyroxene, orthoclase, and in places, scapolite. The minor minerals are pyrite, chalcopyrite, calcite, epidote, chlorite, albite, prehnite, zeolite and rare sphalerite, hematite, pyrrhotite, galena, bornite, marcasite, muschketowite, apatite, sphene, chlorite and fluorite. On the basis of mineral composition, texture and Fe content, the ore has been divided into uniform-magnetite, garnet-magnetite, magnetite-garnet and garnet-skarns. The average composition of the ores is 35.5% Fe, 18.8% SiO2, 0.6% TiO2, 8.3% Al2O3, 0.95% MnO, 11.5% CaO, 1.9% MgO, 0.05% V2O5, 0.7% S, 0.053% P, 0.02% Co, 0.13% Cu and 0.08% Zn. The reserves quoted in 1977 were around 160 Mt of ore (Smirnov, 1977).

The most recent source geological information used to prepare this summary was dated: 1977.    
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

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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