Controlled blasting to minimize overbreak with big boreholes underground

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Mots clés : Controlled blasting;Over-break;Boreholes;Large-diameter boreholes;Drilling;Deck charging;Air spacers
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Texte
Sommaire: This paper describes an alternative method of vehicle control which uses a micro-processor to control the field current and armature voltage concurrently. The field tests carried out and the conclusions drawn from the basis of the paper.
Publication: CIM Bulletin
Auteur(s): J. MORTON
Mots clés: Equipment, Vehicles, Electric vehicles, Drive systems, Motors, Control systems, Power, Energy.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: Hydraulic rock drilling equipment has been in use at Falcon-bridge over the past two years in both production and development situations. This paper deals with the experience gained in the application of hydraulic drilling in the company's mines and discusses the benefits and problems encountered during their use. The paper primarily focuses on technical, operating, maintenance and economic aspects of the machines, and does not attempt to compare the performances of different machines from...
Publication: CIM Bulletin
Auteur(s): J.N. SZUCK, J.A. RIDDELL, K.H. SINGH
Mots clés: Underground mining, Drilling, Sloping, Drifting, Hydraulic drilling, Electric-hydraulic drilling, Falconbridge Nickel, Mines Ltd., Strathcona Mine, East Mine, Fraser Mine.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: The use and development of scientific disciplines involved in heat transfer technology, related in general to steel masses and in particular to batch annealing, is demonstrated.The measurable benefits of cooperation are tabled; on industry's side, this includes a 10 to 20 per cent decrease in annealing time, and a corresponding higher productivity potential. The returned benefits to the academic engineer include the development and refinement of new computer algorithms related to heat...
Publication: CIM Bulletin
Auteur(s): D.S. HARRIES, R.I.L. GUTHRIE
Mots clés: Technology, Batch annealing, Dofasco, McGill University, Heat transfer, Steel.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: The high rock pressures at the deeper levels of the Tsumeb Mine have necessitated the changing of the mining methods and the introduction of cable bolts. After two rock falls in the cable-bolted slopes, the mechanics of cable bolting were investigated. Practical methods were developed to find the best grout mixtures, the bond stresses between cables and cement, the bond stresses between rock and cement and the load on the cable bolts, which was mathematically calculated from data observed...
Publication: CIM Bulletin
Auteur(s): W.H. STHEEMAN
Mots clés: Underground mining, Rock mechanics, Cable bolting, Tsumeb mine, Grouting, Bond stresses, Sloping.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: It has long been recognized that mining workers subjected to high levels of hand-transmitted vibration may suffer from vibration-related complaints. Prolonged exposure to whole-body vibration may also result in adverse effects. In this study, the effects of vibration on mining workers are examined. Previous work documenting the occurrence of vibration-related disease is reviewed. From this work, it is apparent that operators of hand-held pneumatic rock drills are exposed to a significant risk...
Publication: CIM Bulletin
Auteur(s): STANLEY G. MUTTON, ROBERT BRUBAKER
Mots clés: Underground mining, Vibration, Drills, Rock drills, Pneumatic drills, Sullivan Mine, Occupational health.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: There is a world-wide trend toward underground bulk mining methods employing hydraulically placed backfill. This trend is recent and therefore there is little in the literature to assist an operator in the design of backfill properties, the design of drainage facilities, the calculation of the operating forces on a bulkhead, and the control procedures considered necessary before, during and after pouring. This paper presents recommended procedures that are based on over 10 years of experience...
Publication: CIM Bulletin
Auteur(s): JOHN D. SMITH, ROBERT J. MITCHELL
Mots clés: Underground mining, Backfilling, Hydraulic backfill, Bulkheads, Drainage, Plugs, Cemented tailings.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: The budget that was tabled by Finance Minister MacEachen on November 12, 1981 will result in a major tax reform of Canada's income and sales tax systems, the likes of which have not been witnessed by taxpayers since 1971, All segments of the economy will be affected one way or another by the far-reaching budget proposals; the mining industry did not escape untouched.Important changes will be introduced which will alter some of the fundamentals of structuring mineral resource ventures in...
Publication: CIM Bulletin
Auteur(s): ROBERT B. PARSONS
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: La calcination controlee de la serpentinepermet deproduire de la magnesie active. Le degre de ['activation est mesure par la solubilite du magnesium dans les acides faibles tel que I'acide acetique. La serpentine contenue dans les residus d'amiante du Quebec pent done etre activee par calcination. Le teneur en magnesie active des rejets d'amiante calcines est fonction de divers parametres: temperature, temps de calcination, granulometrie, etc. Les rejets d'amiante de differentes provenances...
Publication: CIM Bulletin
Auteur(s): G. GABRA, M. NAGAMORI, J.J. PANNETON
Mots clés: Magnesie, Deshydroxylation, Amiante, Rejets, Serpentine, Calcination, Brucite, Lixiviation.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: This paper traces the main advances in mine lighting from neolithic times to the 1960s. The earliest lights consisted of reeds or strips of wood soaked in grease. As man's knowledge increased, the oil lamp, the candle, kerosene, acetylene and finally electricity have allowed him to see where no natural light could penetrate. These advances in technology, however, did not come easily. Many false starts were made and great dedication was required by a few lighting pioneers to overcome the many...
Publication: CIM Bulletin
Auteur(s): D.A. TROTTER
Mots clés: Underground mining, Lighting, Mine lighting, History, Oil lamps, Safety lamps, Carbide lamps, Electric lighting.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: The Scheelite Dome tungsten-bearing skarn property, central Yukon Territory, is in metasediments in contact with a quartz monzonite intrusion. Contact metamorphism to biotite-muscovite-andalusite hornfels and calc-silicate hornfels is superimposed on low-grade regionally metamorphosed rocks represented by quartz-mica pelitic schist and muscovite-biotite pelitic schist.Metasediments are likely Precambrian in age, even though Rb-Sr whole-rock analyses indicate an early Paleozoic age (511...
Publication: CIM Bulletin
Auteur(s): V.M. KURAN
Mots clés: Economic geology, Geochronometry, Scheelite Dome property, Tungsten, Skarn, Petrology, Yukon Territory.
Numéro: 838
Volume: 75
Année: 1982
Texte
Sommaire: As shortage: in the supply of mineral commodities become more probable, there is an increasing need for reliable and comparable reserve/resource data. It is therefore necessary to standardize the traditional classification procedure by quantifying the three basic criteria in resource evaluation: economic feasibility, geologic assurance and recovery. For the portion of fairly well documented deposits and as far as their geologic parameters are concerned, geostatistical methods can considerably...
Publication: CIM Bulletin
Auteur(s): P. DIEHL, M. DAVID
Mots clés: Mineral reserves, Mineral resources, Ore classification, Ceostatistics, Kriging, Economic feasibility, Recovery, Massive sulphides, Copper-nickel deposits.
Numéro: 838
Volume: 75
Année: 1982
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