A new initiating system and its testing instruments

Abstract In China, the electromagnetic induction initiating system for blasting engineering has been greatly developed in recent years. With this system, the total number of detonators that may be blasted in each round has been increased from 420 to 940 as a result of the invention of a powerful exploder, and the length of legwires of a detonator has reached 12 metres. These developments make the new system suitable for blasting engineering of medium scale. Another attractive feature of this system is a set of testing instruments which have been invented that enable a final check of the system to be made before firing as in normal electric blasting. This paper reports on these developments.
Keywords: Electromagnetic induction, Explosive engineering, Initiating systems, Blasting.
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Publication: CIM Bulletin
Author(s): GASTON GINGRAS
Keywords: Maintenance, Open pit mining, Equipment.
Issue: 918
Volume: 81
Year: 1988
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Publication: CIM Bulletin
Author(s): A.E. HALL, J.-P. SAINDON, L.D. NEL, S.G. HARDCASTLE
Keywords: Heating system, Exhaust air, Gas concentrations, Dust Concentrations, Underground mining, Mining technology
Issue: 918
Volume: 81
Year: 1988
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Summary: This paper studies the progress made by hydraulic shovel manufacturers over the last few years, particularly in the areas of productivity increase and operating cost reductions.
Five years ago, it was widely considered that the unit production cost for a hydraulic shovel in a mining application was double that of a cable shovel in the same application. The hydraulic machine manufacturers have taken up this challenge, and modern improvements in design, coupled with changes in maintenance...
Publication: CIM Bulletin
Author(s): BRIAN REID
Keywords: Open pit mining, Technology, Equipment, Hydraulic machines.
Issue: 918
Volume: 81
Year: 1988
Text
Summary: This paper shows how simple reliability concepts such as mean time between failures and mean repair time can be used efficiently to help increase equipment availability and so reduce the economic losses associated with unreliability.
More specifically, the paper shows how these simple concepts can be used in maintaining an appropriate balance between fleet failure and repair rates and how they can be used for setting up priority repair rules for queuing equipment.
Publication: CIM Bulletin
Author(s): JEAN-LUC COLLINS
Keywords: Equipment maintenance, Computer applications, Open pit operations, Downtime.
Issue: 918
Volume: 81
Year: 1988
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Summary: The underground operations of Kidd Creek Mines uses an average of 450 U.S. gpm water during regular operations, and discharges an average of 800 U.S. gpm through consecutive staged pumping lifts of 1200ft.
Water is used as a flushing medium for the drilling operations and as a dust suppressant for drawpoint mucking. The water retains an average of 5% suspended solids by weight which is removed underground before being pumped to the surface.
This paper outlines the treatment of the mine water...
Publication: CIM Bulletin
Author(s): M.K. WALTER
Keywords: Underground mining, Water treatment, Sludge handling, Kidd Creek Mines, Waste water control.
Issue: 918
Volume: 81
Year: 1988
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Summary: This paper covers the planning, development, and mining of an underground pillar complex using a bulk mining method. To achieve the long-term goal of continually improving our operating processes,  all cut-and-fill and undercut-and-fill workplaces at Thompson Mine have been evaluated for their conversion potential to the bulk method referred to as Vertical Block Mining (V.B.M.).
Since December 1979, conversion has occurred to the extent where 80% of the ore hoisted is mined using...
Publication: CIM Bulletin
Author(s): GEORGE STEWART, ROD MACLEAN
Keywords: Underground mining, Mine development, Pillars, Mining methods, Blasting methods, Vertical block mining.
Issue: 918
Volume: 81
Year: 1988
Text
Summary: Loss of coal fines in reject slurries limits the yield of coal cleaning operations. Difficulties in handling fines also limit the extent of physical cleaning in treating coals with finely-disseminated impurities. Selective oil agglomeration allows even extreme fines to be processed and offers some novel approaches for coal cleaning and utilization.
The oil agglomeration process for the recovery and benefi-ciation of fine and ultrafine coal has now been commercialized by the Chemical Engineeri...
Publication: CIM Bulletin
Author(s): C.E. CAPES, R.D. COLEMAN, J.D. HAZLETT, K.A. JONASSON, W.L THAYER
Keywords: Coal recovery, Beneficiation, Technology.
Issue: 918
Volume: 81
Year: 1988
Text
Summary: The Mount Douglas Granite constitutes the eastern part of the Saint George Batholith and contains the youngest, most differentiated phases of the batholith. It also contains extensive endogranitic, low-grade, Sn-W-Mo-bearing sheeted vein systems. Early phases of the Mount Douglas Granite are coarse- to medium-grained, seriate granites that represent the slowly cooled carapace of the intrusion. Late phases are medium- to fine-grained, equigranular and porphyritic granites that were accompanied...
Publication: CIM Bulletin
Author(s): M.J. McLEOD
Keywords: Economic geology, Geochronology, Sn-W-Mo bearing veins, Mount Douglas Granite, Geochemistry, Mineralization.
Issue: 918
Volume: 81
Year: 1988
Text
Summary: This paper summarizes structural repairs carried out on a marine wharf consisting of six 13.7 m by 13.7 m reinforced concrete cribs linked together by five 14.6 m long beam spans. As a result of problems during original construction and twenty years exposure to severe weather conditions, the deck support system between the cribs required major restoration work. In particular, some of the beam seats under the crane rail supports had marginal bearing area to support the structural loads. Faced...
Publication: CIM Bulletin
Author(s): D.T. AIKENS, R. GAUDREAULT
Keywords: Materials handling, Maintenance/Engineering, Structural repairs.
Issue: 918
Volume: 81
Year: 1988
Text
Summary: Improved rail production techniques provide new options for the rail user. Steelmaking improvements offer tighter composition control, lower oxide and sulphide counts, greater control of segregates and freedom from hydrogen problems. New ultrasonic, laser and eddy current equipment gives printout information on surface flatness, straightness and internal condition. These have come along at a time when dramatic changes have occurred on the rail heat treatment scene. Rails can now be deep...
Publication: CIM Bulletin
Author(s): W.H. HODGSON, R.R. PRESTON
Keywords: Metallurgy, Rail technology, Technology, Steelmaking, Eddy current techniques
Issue: 918
Volume: 81
Year: 1988
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