Predicting the penetration rate of percussive blasthole drills using coarseness index and median particle size

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Mots clés : Percussive drills;Penetration rate;Coarseness index;Median particle size
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Sommaire: The annual budget for the repair and maintenance of equipment at Syncrude Canada Ltd. is in excess of 450 million dollars. Of this amount, a significant portion can be attributed to the loss of material on various pieces of equipment throughout the operation. In order to effectively battle the different wear and corrosion mechanisms that lead to material loss, it is important to understand how materials behave in the environments in which they are used. Since the start of production in 1978,...
Publication: CIM Bulletin
Auteur(s): M. Anderson, S. Chiovelli, S. Hoskins
Mots clés: Reliability, Productivity, Wear, Maintenance, Syncrude
Numéro: 1083
Volume: 97
Année: 2004
Texte
Sommaire: LKAB’s Kiruna mine is a large-scale sublevel caving iron operation, located in northern Sweden. Sublevel caving leaves intrinsically no support between the undercut hangingwall and the footwall, so that the hangingwall deforms, fractures, and then caves.The limits of the deformation, fracture, and caving zones widens as the mine deepens.

LKAB has made significant efforts to monitor the deformation zone and predict when it will reach the town of Kiruna, which is located on the hangingwall...
Publication: CIM Bulletin
Auteur(s): E. Henry, C. Mayer, H. Rott
Mots clés: Interferometry, InSAR, Kiruna, Mining, Subsidence, SAR, Satellite
Numéro: 1083
Volume: 97
Année: 2004
Texte
Sommaire: Introduction

A campaign during the greater part of 2001 at Noranda’s Brunswick mine concentrator investigated the role of gas (air) distribution to the cells in the final Zn cleaning stage. Air-flow was measured as the superficial gas rate (Jg, i.e. the volumetric flow rate per unit cell crosssection) using the Jg sensor designed by the McGill mineral processing group. The distribution is referred to as the “Jg profile.” The final stage comprises two parallel banks of seven Denver DR 100...
Publication: CIM Bulletin
Auteur(s): M. Cooper, D. Scott, R. Dahlke, J.A. Finch, C.O. Gomez
Mots clés: Air distribution, Profiles, Flotation circuit, Sensors, Brunswick mine
Numéro: 1083
Volume: 97
Année: 2004
Texte
Sommaire: In 2000, CANMET-MMSL was engaged by the Ontario Ministry of Labour (OMOL) to conduct a study of the practices, in several key mining jurisdictions, of determining the criteria that are used to decide when the wire ropes used in mine hoisting are to be retired from service. Subsequently, the author visited key officials and institutions in North America, Europe, and Africa. Material from Australia was also included.

The report that resulted included, among other sections: (1) the history of...
Publication: CIM Bulletin
Auteur(s): J.E. Udd
Mots clés: Wire ropes, Testing techniques, Mine hoisting
Numéro: 1083
Volume: 97
Année: 2004
Texte
Sommaire: Agnico-Eagle, LaRonde Division, operates the deepest single-lift shaft in North America. Its Penna shaft successfully introduced lower rope safety factor hoists to Canada based on a code of practice developed in South Africa.

End loads permitted on hoisting ropes are legislated and fall into two broad categories. Rope selection can be based on fixed factors, such as a capacity factor of 7.5 and a safety factor of 5.0, or based on a formula where the factor depends on the suspended rope...
Publication: CIM Bulletin
Auteur(s): B. McLaughlin
Mots clés: Hoisting, Deep shaft, Safety, Regulations
Numéro: 1083
Volume: 97
Année: 2004
Texte
Sommaire: A fuel cell mine production locomotive has been designed and tested in the context of a number of mining proof-of-concept projects. The mining industry is poised to take advantage of the benefits of fuel cells to address pressing issues such as underground air quality, greenhouse gas emissions, and operating costs.

The locomotive’s simple electric-powered motor and controller system was ideal to study hydrogen power plant operation, underground use, risk and regulatory requirements,...
Publication: CIM Bulletin
Auteur(s): M.C. Bétournay, G. Desrivières, P. Laliberté, J. Chan, B. Replogle, A.R. Miller, D.L. Barnes, H. Bursey, D. Sprott, T. MacKinnon
Mots clés: Design, Testing, Fuel cell, Production locomotive
Numéro: 1083
Volume: 97
Année: 2004
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