(Kraj Vysočina)
The Cu-Ag deposit Borovec is named after a nearby village. There are some more occurences of polymetallic ores in the vicinity (Borovec, Štěpánov, Koroužné, Švařec, Čtyři Dvory, Olešnička, Horní Čepí and Černovice), so 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 supegene 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 of "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 variscian.
Refs.:
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.
