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Rock engineering — an important tool to improve the profitability of mining operations
397A 926~.A.A. Engineering geological appraisal of the progress of construction of the Lakhwar underground powerhouse Shome, S K; Kaistha, G K; Jain, A K Proc 6th International Congress International Association o f Engineering Geology, Amsterdam, 6-10 August 1990 V4, P2619-2624. Publ Rotterdam: A A Balkema, 1990 The 130m by 20m by 46m powerhouse cavern is located in a moderately to highly jointed basic intrusive body. Support systems were designed according to empirical methods. Rock loads estimated by R M R are in reasonable agreement with those established by the wedge method. Roof design used the Q system. A conservative approach to support design was taken because of proximity to other major system components. Excavation by drill and blast up to the roof rock has proceeded with no major problems of rock fall. Monitoring instrumentation is being designed and installed. 926445 Influence of faults on tunnel excavation and support, Sikfors Hydropower Station, Sweden Hansen, L; Martna, J Proc International Conference on Mechanics of Jointed and Faulted Rock, Vienna, 18-20 April 1990 P883-889. Publ Rotterdam: A A Balkema, 1990 Several faults were encountered in the Sikfors tunnels. The rock mass is gabbroic. The faults contained breccia, mylonite, and clay seams, and were characterised according to the matrix as stable, pseudostable, or unstable. Different behaviour of the faults corresponded to differences in matrix grain size distribution and presence or absence of swelling clay minerals. Some changes in design of the outlet shaft were required. Comprehensive permanent support was installed to prevent problems in the future.
Mines See also: 926078, 926099, 926208, 926286, 926288 926446 Mining methods and the use of inner space at Kamioka Mine Saito, S In: Rock Mechanics in Japan, Volume VI P63-66. Publ Tokyo: Japanese Committee for ISRM, 1991 The Kamioka mine is worked at two sites. Natural conditions are good: strong, stable country rock and gravity drainage into the valley below. At Tochibora about 4000t/day of low grade silver ore are produced from over 60 orebodies, by open pit, caving, sub-level stoping, or mechanised cut and fill, depending on geology, size, and depth of deposit. Production is running down at Mozumi, but the stable underground space will be used for development work in CAES, explosives, and construction methods and as an underground laboratory. 926447 Review and rationalisation of small scale mining Rainsford, C J Proc A u s l M M 1990 Annual Conference, The Mineral Industry in New Zealand, Rotorua, 18-21 March 1990 P175177. Publ Parkville." AuslMM, 1990 Small scale mining still makes a significant contribution to global mineral production, particularly in developing countries. It has always been a feature of the Australasian mining industry. Factors influencing small scale (less than 150,000 tonnes ore per annum) operations are considered: criticality of exploration strategy, methods used, and socio-economic aspects. An overview of current activities is presented. The
future is discussed, considering advantages in terms of relative costs for exploration, environmental aspects, management, and infrastructure. 926448 Small scale gold mining in developing countries Stewart, D F Proc A u s l M M 1990 Annual Conference, The Mineral Industry in New Zealand, Rotorua, 18-21 March 1990 P189193. Publ Parkville: AuslMM, 1990 The overall impact of small scale and bulk gold mining in developing countries is discussed, with particular attention paid to the Philippines and Papua New Guinea. The shortcomings of the small scale operator in terms of technology are to some extent compensated for by ability to work deposits not suitable for bulk methods and their labour intensiveness in areas of scarce employment. Designation of some regions as 'large' or 'small' scale areas is suggested. Environmental, technical, social, and economic aspects are examined. 926449 Forty-year experience in combating rockburst hazards in Dishergarh seam Singh, R D; Singh, D P In: ROCKBURSTS, Global Experiences (Paper to the 5th Plenary Scientific Session o f Working Group on Rockbursts o f International Bureau of Strata Mechanics, Hyderabad, 2-3 February 1988) P177-199. Publ Rotterdam." A A Balkema, 1990 The Dishergarh seam is thick (3-4.8m), with good quality coal, but highly prone to bumps. Initial extraction in the 1930s was by bord and pillar, but pillar extraction with caving was not possible. Some success was achieved in pillar extraction with stowing. Mechanised longwalling was initially unsuccessful. Mining methods used in other bump-prone regions have been reviewed. Longwall mining with stowing is feasible if the stowing is executed correctly. Longwalling with caving may be successful if the roof is fractured in advance to help induce caving. 926450 Rock engineering - an important tool to improve the profitability of mining operations Wagner, H Proc S A N G O R M Symposium on Impact o f Rock Engineering on Mining and Tunnelling Economics, Welkom, 7-8 October 1991 P1-7. Publ S A N G O R M . Orange Grove, 1991 The goal of rock engineering is to ensure maximum utilization of mineral resources commensurate with minimum rockrelated production losses and rock-related accidents in a mine. Slope design, design of bord and pillar workings, rockburst control, and convergence control by backfill or stabilising pillars are the rock engineering topics briefly examined here. 926451 Methodology for designing pillar layouts for shallow mining Ryder, J A; Ozbay, M U Proc I S R M International Symposium on Static and Dynamic Considerations in Rock Engineering, Swaziland, 10-12 September 1990 P273-286. Publ Rotterdam: A A Balkema, 1990 An outline of the fundamental features of pillar design philosophy is first presented. In situ pillar characteristics and post failure behaviour are examined and physically based modelling procedures to estimate relative stability and assist in pillar layout are described. Regional (barrier) pillar design is summarised. The BEPIL boundary element code is introduced,
© 1992 Pergamon Press Ltd. Reproduction not permitted
Mines See also: 926078, 926099, 926208, 926286, 926288 926446 Mining methods and the use of inner space at Kamioka Mine Saito, S In: Rock Mechanics in Japan, Volume VI P63-66. Publ Tokyo: Japanese Committee for ISRM, 1991 The Kamioka mine is worked at two sites. Natural conditions are good: strong, stable country rock and gravity drainage into the valley below. At Tochibora about 4000t/day of low grade silver ore are produced from over 60 orebodies, by open pit, caving, sub-level stoping, or mechanised cut and fill, depending on geology, size, and depth of deposit. Production is running down at Mozumi, but the stable underground space will be used for development work in CAES, explosives, and construction methods and as an underground laboratory. 926447 Review and rationalisation of small scale mining Rainsford, C J Proc A u s l M M 1990 Annual Conference, The Mineral Industry in New Zealand, Rotorua, 18-21 March 1990 P175177. Publ Parkville." AuslMM, 1990 Small scale mining still makes a significant contribution to global mineral production, particularly in developing countries. It has always been a feature of the Australasian mining industry. Factors influencing small scale (less than 150,000 tonnes ore per annum) operations are considered: criticality of exploration strategy, methods used, and socio-economic aspects. An overview of current activities is presented. The
future is discussed, considering advantages in terms of relative costs for exploration, environmental aspects, management, and infrastructure. 926448 Small scale gold mining in developing countries Stewart, D F Proc A u s l M M 1990 Annual Conference, The Mineral Industry in New Zealand, Rotorua, 18-21 March 1990 P189193. Publ Parkville: AuslMM, 1990 The overall impact of small scale and bulk gold mining in developing countries is discussed, with particular attention paid to the Philippines and Papua New Guinea. The shortcomings of the small scale operator in terms of technology are to some extent compensated for by ability to work deposits not suitable for bulk methods and their labour intensiveness in areas of scarce employment. Designation of some regions as 'large' or 'small' scale areas is suggested. Environmental, technical, social, and economic aspects are examined. 926449 Forty-year experience in combating rockburst hazards in Dishergarh seam Singh, R D; Singh, D P In: ROCKBURSTS, Global Experiences (Paper to the 5th Plenary Scientific Session o f Working Group on Rockbursts o f International Bureau of Strata Mechanics, Hyderabad, 2-3 February 1988) P177-199. Publ Rotterdam." A A Balkema, 1990 The Dishergarh seam is thick (3-4.8m), with good quality coal, but highly prone to bumps. Initial extraction in the 1930s was by bord and pillar, but pillar extraction with caving was not possible. Some success was achieved in pillar extraction with stowing. Mechanised longwalling was initially unsuccessful. Mining methods used in other bump-prone regions have been reviewed. Longwall mining with stowing is feasible if the stowing is executed correctly. Longwalling with caving may be successful if the roof is fractured in advance to help induce caving. 926450 Rock engineering - an important tool to improve the profitability of mining operations Wagner, H Proc S A N G O R M Symposium on Impact o f Rock Engineering on Mining and Tunnelling Economics, Welkom, 7-8 October 1991 P1-7. Publ S A N G O R M . Orange Grove, 1991 The goal of rock engineering is to ensure maximum utilization of mineral resources commensurate with minimum rockrelated production losses and rock-related accidents in a mine. Slope design, design of bord and pillar workings, rockburst control, and convergence control by backfill or stabilising pillars are the rock engineering topics briefly examined here. 926451 Methodology for designing pillar layouts for shallow mining Ryder, J A; Ozbay, M U Proc I S R M International Symposium on Static and Dynamic Considerations in Rock Engineering, Swaziland, 10-12 September 1990 P273-286. Publ Rotterdam: A A Balkema, 1990 An outline of the fundamental features of pillar design philosophy is first presented. In situ pillar characteristics and post failure behaviour are examined and physically based modelling procedures to estimate relative stability and assist in pillar layout are described. Regional (barrier) pillar design is summarised. The BEPIL boundary element code is introduced,
© 1992 Pergamon Press Ltd. Reproduction not permitted