124A 873310 Steel linings in vertical openings Ball, G S; Harrower. J W
Proc of the 1985 Rapid Excavation and Tunneling Conference, New York, 16-20 June 1985 V2, Pl131-1142. Publ New York: AIME, 1985 The installation of steel linings in vertical, raise bored openings is discussed. Design criteria used to evaluate the applicability of liner type and design are presented as well as a brief description of installation procedures. Specific projects are outlined noting special considerations and techniques.
873311 Some recent developments in the valuation and design of a new Witwatersrand gold mine Devine, N J
Proc 13th Congress of the Council of Mining and Metallurgical Institutions, Singapore, I 1-16 May 1986 V3, P1-9. Publ Parkville: CMMI/AIMM, 1986 Exploitation of deep gold ores requires enormous capital outlay, and planning procedures taking into account rock mechanics implications have consequently been developed. Amongst the topics examined are shaft pillar design criteria, including differential movements and in situ stress levels, development and support of shaft and service excavations, and mining layouts for both development and stoping.
873312 Development of Hilton mine, 1947-1985 Black, B N; Mutton, B K
Proc 13th Congress of the Council of Mining and Metallurgical Institutions, Singapore, 11-16 May 1986 V3, Pll-20. Publ Parkville: CMMI/AIMM, 1986 The Hilton lead-zinc-silver mine is in the same rock types as the neighbouring Mount Isa mine, but the rocks are more faulted, jointed and intersected by intrusive dykes. This poses new challenges, requiring a co-ordinated program of mine exploration and development, and rock mechanics investigations. The geological and groundwater problems, and development to date, and proposed exploitation by stoping and cut and fill extraction are described. Production from the mine is due to start in 1986.
873313 Modelling of shaft displacement due to nearby mining - Dome gold mine, Canada Jeremic, M L; Mandzic, E H
Proe I3th Congress of the Council of Mining and Metallurgical Institutions, Singapore, 11-16 May 1986 V3, P31-34. Publ Parkville: CMMI/AIMM, 1986 Before mining an orebody lying partly in the No3 shaft pillar, ground movement was modelled by finite element analysis. Results predicted displacements around the shaft of less than lmm/m for open stoping, and one third less for cut and fill mining for stope layout at depths 180-210m and distances 1050m from the shaft. Subsequent extraction confirmed these results for cut and fill extraction.
873314 Changes in underground coal mining technology - an Australian outlook Marshall, P; Lama, R D
Proc 13th Congress of the Council of Mining and Metallurgical Institutions, Singapore, 11-16 May 1986 V3, P91-101. Publ Parkville: CMMI/AIMM, 1986 Underground mining will become the dominant method in Australia as surface workable coal deposits become exhausted. Hugh in situ stresses and gassy coal can be expected in deep mines. Longwall extraction is the most suitable mining method and the use of yield pillar systems (Stress Control Technology), adapted from salt mines, is proposed. Mine layout, pre-drainage of gas, roadway design and drivage are discussed. The use of new technologies in such areas as hydraulic mining, robotics, monitoring systems, machinery, and transportation is briefly examined. 873315 Longwall mining - viable in the '90s? Bloemsma, J P; Hiley, W H; Johnson, A C
Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P57-64. Publ Johannesburg: Anglo American Corporation, 1985 A coal seam approximately 2m thick and at average depth 200m will be worked at the New Denmark Colliery, South Africa. Total extraction will be used rather than conventional bord and pillar extraction. Economic and technical advantages of longwall mining and rib and pillar extraction, at the present and with foreseen future developments and at various seam thicknesses, are compared and discussed. Layout, services and equipment are described. It is concluded that both methods will be used, with longwall replacing rib and pillar in the 1990s. 873316 Double-lift system of mining a thick coal seam Lombard, S B; Meyer, W J G
Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P65-72. Publ Johannesburg: Anglo American Corporation, 1985 Volumetric extraction of thick seams at the Springfield Colliery, South Africa, is low using bord and pillar mining, and methods to improve it have been examined. Block caving and sub-level mining are precluded because of methane gas and spontaneous combustion problems, and a double lift mining method using primary bord and pillar and secondary extraction stoping has been adopted. Mine layout, mining sequences, rock mechanics aspects, and computer simulated surface subsidence are described. 873317 Shafts of the '90s Sweet, C A F
Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 Pl15-120. Publ-Johunnesbl~'g." Anglo American Corporation, 1985 Construction of a 6.02m diameter, 500m deep ventilation shaft at the Premier Mine, South Africa, is described. The raise boring method of shaft sinking was decided upon after considering the following factors: speed of construction; costs; need for a smooth walled shaft; infrastructure required for construction; support; and safety requirements. Raise boring is, in particular, competitive on costs when good ground access and handling facilities are available.
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