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Showing: 1 to 10 of 70 matches for "Jack Leg Drills"  Page   1   2   3   4   5   6   7 TITLE Land Shaft Construction And Initial Station Development For Seabrook Station Cooling Water Tunnels  SUMMARY ... The north wall of the shaft was drilled horizontally with jack leg drills, three rounds were taken between elev (-)234 and (-)249, and the brow rounded off to ... AUTHOR Hulshizer, Allen J. ; Stuart, Jack C. ; Obradovic, Robert L. ; Stewart, Anthony J. PUBLISHED 1979 TITLE Rapid Excavation - A Perpetual Goal  SUMMARY ... The introduction of jack-leg drills was accelerated when miners recog- nized that it was easier to complete drill rounds with the lightweight jack-leg drill ... AUTHOR Garfield, Lawrence A. PUBLISHED 1971 TITLE Mechanized Mining of Narrow Veins – Problems and Equipment Options  SUMMARY ... profitability of nar- row vein mines. In most cases, it is done by pneumatic jack- leg drills. Due to workforce safety reasons, as ... AUTHOR Paraszczak, Jacek PUBLISHED 1992 TITLE Field Performance Evaluation Of A Rock Drill Handle Design  SUMMARY ... of reduction of hand-transmitted vibration produced by jackleg drills underground that ... steel handle, which is fixed, and control of the jack leg pressure is ... AUTHOR De Souza, E. M. ; Moore, T. N. PUBLISHED 1994 TITLE Case study : Ozark-Mahoning, sole surviving US fluorspar producer  SUMMARY ... Drilling is done with a jumbo where heading size will al- low. In other areas, Gardner 83 jack leg drills are used. Blasting, where possible, is with ANFO. ... AUTHOR Evans, V. A. ; Hellier, D. L. PUBLISHED 1986 TITLE Development, Installation, and Effect of an Underground Crushing and Conveying System at Pea Ridge  SUMMARY ... decline advanced. In September, a three-boom jumbo on a diesel-powered carrier supplanted the jack- leg drills. The remaining three ... AUTHOR Irvine, J. C. PUBLISHED 1973 TITLE Performance of Grouting Programin Cambridge Argillite at Inter-Island Tunnel  SUMMARY ... Drilling of radial fans with a jack leg was avoided due to the lack of any inclination ... The drills were located at a distance less than 1 m (3.25 ft) behind the ... AUTHOR Page, Troy L. ; Crouthamel, David R. ; Fong, Francis L. PUBLISHED 1997 TITLE Exhibitors at Metal Mining Exposition  SUMMARY ... A large number of new products, such as rock drills, Carset jack- bits, lighter drill mountings, and an improved Jack- leg for mounting jackhammers. ... PUBLISHED 1950 TITLE Metal Mining - Underground Mining Trends in the Great Swedish Export Iron Ore Mines  SUMMARY ... was de- signed, in collaboration with Atlas-Diesel Co., the well-known air-leg or jack-leg in combination with a number of rather small drills, which made a ... AUTHOR Hjortzberg-Nordlund, Borje PUBLISHED 1953 TITLE Underground Mining Trends In The Great Swedish Export Iron Ore Mines  SUMMARY ... was de- signed, in collaboration with Atlas-Diesel Co., the well-known air-leg or jack-leg in combination with a number of rather small drills, which made a ... AUTHOR Hjortzberg-Nordlund, Borje PUBLISHED 1952 Showing: 1 to 10 of 70 matches for "Jack Leg Drills"  Page   1   2   3   4   5   6   7 Search Again