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Last years, considerable interest has been observed in the methods of mechanical mining of difficult mining rocks, especially those with high silica content such as copper ores. However, such rocks are also found in hard coal mines and other metal ores as well as in tunnels drilling. Mechanical mining allows for a complete mechanisation of the exploitation of deposits and elimination of mining method which uses explosive materials. Nowadays, conical picks or disc tools are most often used for the mechanical mining...