Blasthole stoping for narrow vein mining

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Mots clés : Underground raining;Narrow vein mining;Blasthole stoping
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Sommaire: This paper describes the simultaneous sinking and equipping of a 4.9 m diameter concrete-lined shaft to a projected depth of 1660 m. The shaft blast design utilizes the full face method using a parallel hole burn cut. Hydraulic drilling and a totally redesigned Cryderman-type mucking unit were integrated into the four deck sinking stage to provide for drilling, mucking, concreting and shaft steel equipping operations. A safety program was tailored and implemented specifically for this shaft...
Publication: CIM Bulletin
Auteur(s): M.J. Medd, G.A. Speirs
Mots clés: Underground mining, Shaft sinking, Blasting, Concrete lining, Steel furnishing, Safety.
Numéro: 945
Volume: 84
Année: 1991
Texte
Sommaire: Chrysotile asbestos can be dyed with certain dyestuffs to form stable coloured products whose hemolytic and cytotoxicity are greatly reduced. Examples of these dyes are Thiazol Yellow G (a monazo dye) and Trypan Blue (a diazo dye). Other dyestuffs, for example, basic dyes with triphenylmethane structure, Brilliant Yellow (a diazo dye), and Methylene Blue (a thiazine dye) colour asbestos but do not reduce its toxicity. Similarly alizarin, 8-hydroxyquinoline, and representative members of the...
Publication: CIM Bulletin
Auteur(s): Fathi Habashi, Farouk T. Awadalla, Michel Page
Mots clés: Chrysotile asbestos, Dyestuffs, Cytotoxicity, Hemolysis.
Numéro: 945
Volume: 84
Année: 1991
Texte
Sommaire: AECL Research has constructed an underground laboratory for the research and development required for the Canadian Nuclear Fuel Waste Management Program. The experimental program in the laboratory will contribute to the assessment of the feasibility and safety of nuclear fuel waste disposal deep in stable plutonic rock.
In 1988, AECL extended the shaft of the Underground Research Laboratory (URL) from the existing 255 m depth to a depth of 443 m in cooperation with the United States Departmen...
Publication: CIM Bulletin
Auteur(s): G.W. Kuzyk, J.R. Morris, A.E. Ball
Mots clés: Underground excavation, AECL Research, Nuclear fuel waste disposal, Shaft sinking, Mine design, Instrumentation, Blast design, Ground control.
Numéro: 945
Volume: 84
Année: 1991
Texte
Sommaire: Ground stresses are one of the significant factors in the context ofrockbursts and underground instability at some hard rock mines in Canada. Overcoring strain relief measurements using tri-axial strain cells were performed at several mine sites to provide stress data for stability evaluations and mine design. Pre-mining stress determinations carried out at depths between 60 m to 1890 m resulted in the following average stress gradients:Maximum horizontal stress, aHmax = 8.18 + 0.0422 MPa/m...
Publication: CIM Bulletin
Auteur(s): B. Arjang
Mots clés: Rock mechanics, Ground stress, Underground stress measurements.
Numéro: 945
Volume: 84
Année: 1991
Texte
Sommaire: The Saskatchewan potash beds are overlain by a number of water-bearing formations. There are water zones in the footwall as well. These aquifers created difficulties during the construction of shafts to the potash beds at 1000 m depth, and they pose a continuous threat to the safe and efficient operation of potash mines in the province.
The first shafts to be sunk in Saskatchewan encountered major problems during shaft sinking. Of the 17 potash shafts started in the province, five had major...
Publication: CIM Bulletin
Auteur(s): Fritz F. Prugger, Arnfinn F. Prugger
Mots clés: Potash mining, Underground mining, Water-bearing formations, Saskatchewan potash industry.
Numéro: 945
Volume: 84
Année: 1991
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