Stope development for raise mining at the Namew Lake mine

Abstract Raise mining at the Namew Lake Nickel Mine in Manitoba uses 3 m diameter bored raises driven at 45 to 50 degrees dip for slope access and drilling. These raises are developed within the orebody on 20 m centres to accommodate electric-hydraulic longhole jumbos and charging wagons. Critical elements ofstope development include delineation of ore contacts, control of deviation during raise development, optimal slope sequencing to permit a high extraction rate, drill anchorage installation, production drilling and blasting, and ground control. Procedures to deal with these elements are described, with emphasis on the geotechnical investigation for design of open slopes and pillars.
Although mining with drilled raises does not have the flexibility to follow large variations in orebody dip, results to date indicate that it can be used successfully in the thicker ore zones. Thinner zones are currently mined using a modified Avoca method. Some flexibility to accommodate variations in orebody dip in thin ore zones may be obtained by using alimack raise climbers to drive access raises, and carry longhole drills and charging equipment. Rock quality has been sufficiently good to maintain stable slope walls for full-height mining of primary slopes at 20 m strike length.
Keywords: Raise mining, Namew Lake mine, Nickel deposits, Manitoba.
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Summary: Two recent decisions by the Canadian courts could reduce the taxes paid by many profitable mines in Canada. At a time when the mining sector is hurting from an ever increasing tax burden and soft prices, the results of two cases are welcome news. Mining companies are well advised to check prior years' tax returns in the context of these developments.
Publication: CIM Bulletin
Author(s): Robert B. Parsons
Issue: 949
Volume: 84
Year: 1991
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Publication: CIM Bulletin
Author(s): M. Cossette, V.H. Iran
Keywords: Industrial minerals, Asbestos, Asphalt.
Issue: 949
Volume: 84
Year: 1991
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Publication: CIM Bulletin
Author(s): G. Grant Smith
Keywords: Coal, In situ bulk density, Compositing, Resource estimation.
Issue: 949
Volume: 84
Year: 1991
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Publication: CIM Bulletin
Author(s): Lars Liljeblad
Keywords: Equipment design, Materials technology, Drilling equipment, Tungsten carbide, Cobalt.
Issue: 949
Volume: 84
Year: 1991
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Summary: In late 1985, Hudson Bay Mining and Smelting Co., Limited announced the Namew Mine/Mill project. Environmental baseline monitoring and planning began in early 1985 while a major drilling program was under way to delineate the ore deposit. This paper overviews the environmental assessment work conducted for the mine/mill operation, and outlines the tailings and water management practices.
Planned environmental works and approach were affected in late 1988 when a massive water problem was...
Publication: CIM Bulletin
Author(s): W.W. Fraser
Keywords: Environmental management, Namew Lake, Hudson Bay Mining and Smelting Co. Ltd.
Issue: 949
Volume: 84
Year: 1991
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Publication: CIM Bulletin
Author(s): R.J. Barclay, M.P. Kat
Keywords: Rock mechanics, Ground control audits, Ontario mines, Safety.
Issue: 949
Volume: 84
Year: 1991
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