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Rib-pillar mining at Sigma Colliery
130A lateral drifts of approximate section 3m wide by 3.75m high. A 4m diameter Robbins TBM was purchased which has to date driven over 1500m in only 3 months.
Power plants 922447 Post-constnlction performance of underground power house cavern in poor rocks of Lower Himalaya Mitra, S; Singh. B Proc In,an Geoteclmical Conference, 1989, Geotechniques of Problematic Soils and Rocks, gisakbapatnam, 14-16 December 1989 VI, P415-419. Publ New Delhi: Sarita Prakashan, 1989 The Chhibro underground powerhouse in dolomitic limestones was the first large cavern in the tectonically active Himalayas, and because of lack of precedent experience, results from its monitoring system are of great interest. Geology, design, construction and instrumentation are briefly outlined. Analysis and interpretation of data collected over a seven year period are undertaken. Seepage is seen to have affected support pressure, as has recurring earthquake shocks close to thick shear/fault zones. Moderate earthquakes have temporary effects on anchor loads. Data indicate the present factor of safety of the cavern is high and it remains relatively stable.
control including backfill placement, drills and drilling, explosives and blastin g . and ore removal. Reference is made to real mine data. The safer? aspects are e . :'~r.ed ar.d relative benefits and dra'a~'.,:ks on economic ~nd technical grounds are discussed.
922451 Three-dimensloMI modelUng of fill drainage in mine stopes Traves, W H; Isaacs, L T Trans lnst Min Memll (Sect A Min lad) 11100, May-Aug 1991, PA66-A72 To assist in planning of hydraulic filling operations and design of mine bulkheads, an existing 2D model of fill drainage has been expanded to 3 dimensions and refined. It can model irregular geometries and heterogeneous fills and predict flows and pore pressure at any location within the stope. It uses a cell-based approach to model the geometry of the stope and flow through the fill. Fill emplacement can be simulated and both saturated and unsaturated flow accommodated. Expansion to 3 dimensions and incorporation of unsaturated flow are seen to increase the practical value of the modelling. An example is illustrated.
Mines See also." 922263, 922319 922448 Bore or blast Nadon, M R; Kelly, M J Engng Min J V192, N7, July 1991, P34-36 Mine raises may be constructed with available machinery, raise layout, or method to be used as the primary consideration. Blasting using the Alimak Raise Climber or modern raise drilling are two available techniques. A comparative study is presented as to the suitability of these methods for the variety of raises, passes, shafts, and holes in underground mines, considering dimensions and purpose of use. Costs, schedules, and safety are examined. Recent examples of their application are described, including one where both techniques were used. 922449 Rib-pillar mining at Sigma Colliery De Beer, J J S; Hunter, F; Neethling, A F J S Aft inst Min Metail V91, N6, June 1991, P209-218 The mining method now used at the Sigma Colliery in the Orange Free State in described. Access roadways (4 in primary development, 3 in secondary development) with a high factor of safety are driven in a block of coal suitable for total extraction. Pillars with a low factor of safety are then formed and extracted immediately. Layout and cutting sequence, planning, support and environmental control are considered. High productivity, good use of resources and capital, and improved safety have resulted from adoption of this strategy. 922450 Vertical crater retreat mining in the Sudbury Basin Trotter, D A g i n Sci Teclmol V13, N2, Sept 1991, P131-143 VCR mining now accounts for about three quarters of the base metal sulphides mined in the Sudbury Basin. An overview of the VCR method is presented, considering layout, ground
922452 Application of a roadheader for kimberlite development at Finsch diamond mine Wilkinson, C G B; Lockerbie, R; Thompson, P Excavate and Support in the 90s, Proe SANCOT Seminar 1990, South Africa, November 1990 P87-118. Publ South Africa: Goldfields Press, 1990 In order to minimise the costs of development and reduce tunnel damage caused by blasting, a roadheader was introduced at Finsch mine. In assessing the suitability of this machine, materials and power requirements, support, ventilation requirements, production sequencing, mining layout, and movement of the roadheader were examined. Productivity achieved, system availability and machine utilisation, operation delays, and cutting rate achieved are described. Advantages over blasting, stability of the tunnel, and operating costs are discussed.
922453 Deep hole raise boring at Falconbridge Operations, Sudbury, Ontario Pugsley, T F; Gallagher, J; Davies, W J Proc 1989 Rapid Excavation and Tunnelling Conference, Los Angeles, 11-14 June 1989 P463-479. Publ Littleton: SME, 1989 The Craig orebody will be accessed from the Onaping mine on the 600 and 1250m levels. Two 1200m ventilation shafts through norite and granitic gneiss will be required during mine development and initial ore production. Raise boring was chosen instead of conventional shaft sinking methods, and a Robbins 97RL raise drill purchased to excavate the shafts at diameter in 600m lifts. Method and equipment selection criteria, pilot hole drilling, and reaming are described.
© 1992 Pergamon Press Ltd. Reproduction not permitted
Power plants 922447 Post-constnlction performance of underground power house cavern in poor rocks of Lower Himalaya Mitra, S; Singh. B Proc In,an Geoteclmical Conference, 1989, Geotechniques of Problematic Soils and Rocks, gisakbapatnam, 14-16 December 1989 VI, P415-419. Publ New Delhi: Sarita Prakashan, 1989 The Chhibro underground powerhouse in dolomitic limestones was the first large cavern in the tectonically active Himalayas, and because of lack of precedent experience, results from its monitoring system are of great interest. Geology, design, construction and instrumentation are briefly outlined. Analysis and interpretation of data collected over a seven year period are undertaken. Seepage is seen to have affected support pressure, as has recurring earthquake shocks close to thick shear/fault zones. Moderate earthquakes have temporary effects on anchor loads. Data indicate the present factor of safety of the cavern is high and it remains relatively stable.
control including backfill placement, drills and drilling, explosives and blastin g . and ore removal. Reference is made to real mine data. The safer? aspects are e . :'~r.ed ar.d relative benefits and dra'a~'.,:ks on economic ~nd technical grounds are discussed.
922451 Three-dimensloMI modelUng of fill drainage in mine stopes Traves, W H; Isaacs, L T Trans lnst Min Memll (Sect A Min lad) 11100, May-Aug 1991, PA66-A72 To assist in planning of hydraulic filling operations and design of mine bulkheads, an existing 2D model of fill drainage has been expanded to 3 dimensions and refined. It can model irregular geometries and heterogeneous fills and predict flows and pore pressure at any location within the stope. It uses a cell-based approach to model the geometry of the stope and flow through the fill. Fill emplacement can be simulated and both saturated and unsaturated flow accommodated. Expansion to 3 dimensions and incorporation of unsaturated flow are seen to increase the practical value of the modelling. An example is illustrated.
Mines See also." 922263, 922319 922448 Bore or blast Nadon, M R; Kelly, M J Engng Min J V192, N7, July 1991, P34-36 Mine raises may be constructed with available machinery, raise layout, or method to be used as the primary consideration. Blasting using the Alimak Raise Climber or modern raise drilling are two available techniques. A comparative study is presented as to the suitability of these methods for the variety of raises, passes, shafts, and holes in underground mines, considering dimensions and purpose of use. Costs, schedules, and safety are examined. Recent examples of their application are described, including one where both techniques were used. 922449 Rib-pillar mining at Sigma Colliery De Beer, J J S; Hunter, F; Neethling, A F J S Aft inst Min Metail V91, N6, June 1991, P209-218 The mining method now used at the Sigma Colliery in the Orange Free State in described. Access roadways (4 in primary development, 3 in secondary development) with a high factor of safety are driven in a block of coal suitable for total extraction. Pillars with a low factor of safety are then formed and extracted immediately. Layout and cutting sequence, planning, support and environmental control are considered. High productivity, good use of resources and capital, and improved safety have resulted from adoption of this strategy. 922450 Vertical crater retreat mining in the Sudbury Basin Trotter, D A g i n Sci Teclmol V13, N2, Sept 1991, P131-143 VCR mining now accounts for about three quarters of the base metal sulphides mined in the Sudbury Basin. An overview of the VCR method is presented, considering layout, ground
922452 Application of a roadheader for kimberlite development at Finsch diamond mine Wilkinson, C G B; Lockerbie, R; Thompson, P Excavate and Support in the 90s, Proe SANCOT Seminar 1990, South Africa, November 1990 P87-118. Publ South Africa: Goldfields Press, 1990 In order to minimise the costs of development and reduce tunnel damage caused by blasting, a roadheader was introduced at Finsch mine. In assessing the suitability of this machine, materials and power requirements, support, ventilation requirements, production sequencing, mining layout, and movement of the roadheader were examined. Productivity achieved, system availability and machine utilisation, operation delays, and cutting rate achieved are described. Advantages over blasting, stability of the tunnel, and operating costs are discussed.
922453 Deep hole raise boring at Falconbridge Operations, Sudbury, Ontario Pugsley, T F; Gallagher, J; Davies, W J Proc 1989 Rapid Excavation and Tunnelling Conference, Los Angeles, 11-14 June 1989 P463-479. Publ Littleton: SME, 1989 The Craig orebody will be accessed from the Onaping mine on the 600 and 1250m levels. Two 1200m ventilation shafts through norite and granitic gneiss will be required during mine development and initial ore production. Raise boring was chosen instead of conventional shaft sinking methods, and a Robbins 97RL raise drill purchased to excavate the shafts at diameter in 600m lifts. Method and equipment selection criteria, pilot hole drilling, and reaming are described.
© 1992 Pergamon Press Ltd. Reproduction not permitted