Borovec, Štěpánov nad Svratkou, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic

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Kraj Vysočina

The Cu-Ag deposit Borovec is named after a nearby village; adits and old workings are east and southeast of Borovec. There are some more occurrences of polymetallic ores in the vicinity (Borovec, Štěpánov, Koroužné, Švařec, Čtyři Dvory, Olešnička, Horní Čepí and Černovice), and the common name for all of them is the Štěpánov ore district. Štěpánov lies close to NW edge of Svratka dome in Moravicum unit, in narrow belt of Olešnice group (staurolite and garnet mica schists, phyllites, limestones, paragneisses, metabazite rocks).
There are two types of mineralization in ore district. First is Cu-Pb vein mineralization near Borovec (quartz, calcite, baryte, chalkopyrite, galena). Other primary minerals (sphalerite, pyrite, marcasite, tetraedrite) are rare. Typical are supergene Cu-minerals. Ag-content in galena is low (less than 0.01 %). Near Koroužné, Švařec, Olešniča a Horní Čepí je is Pb-Zn mineralization developed in hydrothermal veins and in metasomatic ores (quartz, calcite, ankerite, siderite, locally baryte, ore minerals: sphalerite, galena, accessories pyrite, chalkopyrite, arsenopyrite, tetraedrite, freibergite, boulangerite, stibnite etc). Secondary minerals are rare (except for "limonite"). Metasomatic ores are developed in crystalline dolomitic limestones, often with graphite and quartz. Ag-content in galena is around 0.1 %, exceptionally around 0.5 %. Age of mineralisation is considered Variscan.

References

- Houzar, S., Malý, K.: Přehled mineralogie, ložiskových poměrů a historie štěpánovského rudního revíru na západní Moravě. Acta Musei Moraviae, Scientiae geologicae, 2002, roč. 87, s. 5-59.
- Velebil, D., Kráčmar, L.: Ložisko Borovec u Štěpánova (štěpánovský revír). Minerál, 2002, roč. 10, č. 3, s. 163–181.
- Hrazdil, V., Houzar, S., Kocourková, E. and Sejkora, J. (2011): Das Erzrevier Stepánov in Westmähren (Tschechien) und seine Mineralien. Lapis 36 (9), 41-46; 62 (in German).

Mineral List

Acanthite Actinolite Allophane 'Amphibole Group' Andalusite Anglesite Ankerite Aragonite Arsenopyrite Auricupride Azurite Baryte Bornite Boulangerite Bournonite Brochantite Calcite Cerussite Cervantite Chalcocite

Chalcophyllite Chalcopyrite 'Chlorite Group' Chrysocolla Copper Covellite Cuprite Delafossite Djurleite Dolomite Epidote Evansite Freibergite Galena 'Garnet' Goethite Gold Graphite Greenockite Gypsum

Hematite Hemimorphite Ilmenite Jarosite Langite Limonite Magnetite Malachite Marcasite Mimetite Olivenite Opal Orthoclase Plumbojarosite Polybasite Posnjakite Pyrargyrite Pyrite Pyromorphite Pyrrhotite

Quartz var: Chalcedony var: Rock Crystal var: Smoky Quartz Siderite Silver Smithsonite Sphalerite Stibnite Sulphur Tenorite Tetrahedrite 'Tourmaline' Tremolite Tyrolite Valentinite Vanadinite 'Wad' Zoisite

79 entries listed. 69 valid minerals.