TY  - CPAPER
AU  - Borys Borowka
TI  - IMPACT OF GEOLOGICAL AND MINING CONDITIONS ON TO COSTS OF DRILLING THE ACCESS WORKINGS IN HARD COAL MINES WITHIN THE UPPER SILESIAN COAL BASIN (POLAND)
T2  - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING
PY  - 2015
DO  - 10.5593/sgem2015/b11/s1.030
PB  - Stef92 Technology
ER  -