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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...

This study outlines the solution to the problem caused by too large numbers of hiking tourists and skiers walking on top of the Kasprowy Wierch Mountain in the Tatra National Park, between three ski stations (one cable car and two chairlifts). Their choice of route is limited mostly due to a large difference in altitude between the top chairlift station on the Gasienicowa Glade and two other ski stations. To improve the conditions in the area of those ski stations a solution was sought that would permit an easy pa...