Simulation of a longwall development extraction network

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Mots clés : Simulation;Longwall development;Project management
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Sommaire: The February 18, 1987, Federal Budget contains a proposed amendment which would simplify somewhat the "successor corporation" rules in the Income Tax Act. Despite this amendment, though, the important successor rules will continue to be relatively complex.
Publication: CIM Bulletin
Auteur(s): ROBERT B. PARSONS
Numéro: 903
Volume: 80
Année: 1987
Texte
Sommaire: An approach to the in situ testing of mine backfills is outlined. It has been developed to provide a measure of the effective strength and stiffness of such materials after placement in stapes. This paper is based upon recent field studies undertaken at five Quebec mines. Details of the selected instrumentation, supporting equipment and testing procedures are reviewed. The mechanical behaviour of the backfills is reported and related to their physical properties. This approach represents an...
Publication: CIM Bulletin
Auteur(s): MALCOLM SCOBLE, LUCIANO PICIACCHIA, JEAN-MARC ROBERT
Mots clés: Rock mechanics, Underground mining, Backfills, Stopes, In situ testing, Mine design, Quality control.
Numéro: 903
Volume: 80
Année: 1987
Texte
Sommaire: This paper describes the objectives and design parameters for the operation of a computerized In-The-Hole (I.T.H.) Drill. The principal objective is to add computer control to an Inco GO-60 I.T.H. (CMS-CD-90) drill in order to drill holes with greater accuracy. The computer provides control of the angle of the hole by maintaining the orientation of the drill head, and optimizes the straightness of the hole by maintaining a constant force on the drill bit.
The second objective is to provide...
Publication: CIM Bulletin
Auteur(s): J. KELLY, R. ENGLAND
Mots clés: Drill design, Computer controlled drilling, Rod handling, I.T.H. drill rig, GO-60 drill.
Numéro: 903
Volume: 80
Année: 1987
Texte
Sommaire: This paper describes the objectives and design parameters for the operation of a computerized In-The-Hole (I.T.H.) Drill.
The principal objective is to add computer control to an Inco GO-60 I.T.H. (CMS-CD-90) drill in order to drill holes with greater accuracy. The computer provides control of the angle of the hole by maintaining the orientation of the drill head, and optimizes the straightness of the hole by maintaining a constant force on the drill bit.
The second objective is to provide...
Publication: CIM Bulletin
Auteur(s): J. KELLY, R. ENGLAND
Mots clés: Drill design, Computer controlled drilling, Rod handling, I.T.H. drill rig, GO-60 drill.
Numéro: 903
Volume: 80
Année: 1987
Texte
Sommaire: Analysis of gold placer data from gold placers throughout the world suggests that gold grades and volumes cannot be used to distinguish between most types of gold placers. Only the alluvial plain and fan placers are significantly different among the types of gold placers considered. Gold grades and volumes change when working gold placers go from small-volume methods to large-volume methods. The small-volume methods are either of the surface or subsurface (drift mining) type. The odds that a...
Publication: CIM Bulletin
Auteur(s): J.D. BLISS, G.J. ORRIS, W.D. MENZIE
Mots clés: Gold placer deposits, Simulation, Gold recovery, Grade-volume models, Grade estimation.
Numéro: 903
Volume: 80
Année: 1987
Texte
Sommaire: Centrifuge modelling of earth structures is a well-proven technique for evaluating the performance of prototype structures using physical models. The applications of this technique have increased dramatically during the last decade such that even the modelling of dynamic responses in structures has been accomplished.
This paper presents the first model test results used to design a mine backfill. The models were tested using aim radius 30 g-tonne geotechnical centrifuge which was constructed...
Publication: CIM Bulletin
Auteur(s): R.J. MITCHELL, J.D. SMITH
Mots clés: Rock Mechanics, Centrifuges, Modelling, Backfill design, Mine backfill, Stability, Subsidence.
Numéro: 903
Volume: 80
Année: 1987
Texte
Sommaire: Sulphuric acid treated with hydrogen peroxide to destroy organic contaminants could conceivably show increased cor-rosivity toward carbon steel shipping and storage vessels, caused by the persistence of a peroxide residual. This paper describes work performed to determine the effect of 0-200 ppm hydrogen peroxide on the corrosion of carbon steel by 93% and 98% sulphuric acid at room temperature (23 °C) and 50°C.
Steel electrodes were exposed to acid containing several peroxide levels...
Publication: CIM Bulletin
Auteur(s): C.M. DAVIDSON, D.J. DREXLER
Mots clés: Hydrogen peroxide, Carbon steel, Corrosion , Contaminants.
Numéro: 903
Volume: 80
Année: 1987
Texte
Sommaire: Surface crown pillars, acting to safely protect underground workers and operations from surface elements, are recognized, herein, as distinct from conventional deeper underground pillars. Moreover, because of the variation in mining and geological conditions that exist from mine site to mine site, each case is viewed as unique. A review of numerous case studies and existing literature indicates that there is little general information or systematic problem-solving approach associated with...
Publication: CIM Bulletin
Auteur(s): MARC C. BETOURNAY
Mots clés: Rock mechanics, Surface crown pillars, Canadian mines, Design philosophy, Design process, Geotechnical investigations, Mining strategy, Design methods, Mining activity, Monitoring, Back analysis, Pillar recovery, Design evaluation.
Numéro: 903
Volume: 80
Année: 1987
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