Slope Stability Analysis and Design Based On Probability Techniques at Cassiar Mine

Abstract This paper describes the open-pit studies relating to slope stability and design of the argillitic waste rocks which form the upper 700 feet of the 1000- to 1100-ft high hanging-wall slope at the Cassiar Mine. Analyses indicated that the likelihood of deep-seated failure in terms of slope angles which are geometrically possible was low. However, wedge failures on benches, which involve either whole or parts of the benches, were found to be of principal importance with respect to stability.
Slope stability analyses and related slope design were based essentially on evaluating the geometry of the potential wedge failures in terms of the probability of occurrence of unstable wedge failures which could spill over the berms. Probability theory is developed and applied in such a way that the possibility of benches on the slope becoming ineffective is evaluated and related to over-all slope design. The probability of possible wedge failures spilling over berms of various widths, which are a function of the bench geometry, geometry of the possible failure, over-all slope angle and angle of repose of material involved in the possible wedge failures, is considered. Based on this approach, mine management could evaluate alternative slope designs and decide themselves on what probability of bench failure they feel is acceptable for their particular mining operation.
Keywords: Rock mechanics. Slope stability, Cassiar Mine, Groundwater, Open-pit mining, Pit slopes, Joint sets, Shears, Wedges, Blasting, Control blasting, Probability design.
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Publication: CIM Bulletin
Author(s): Herbert D. Drechsler
Issue: 779
Volume: 70
Year: 1977
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Summary: Load-haul-dump machines equipped with a torque converter and hydraulic pumps have been field tested by means of an engine monitoring instrumentation package. It was found that owing to parasitic losses in the ancillaries and drivetrain, maximum available useable power may peak at less than full engine speed. Simple reduction of engine speed may save 15 to 25 per cent on fuel consumption, with no significant loss of available power. On some machines, speed reduction will require modification...
Publication: CIM Bulletin
Author(s): D. B. Stewart, J. P. Mogan
Keywords: Underground mining, LHD mining, Diesel engines, Engine speed reduction, Exhaust emissions, Fuel consumption, Heat, Noise, Maintenance.
Issue: 779
Volume: 70
Year: 1977
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Summary: This paper describes the geological procedures used to evaluate two mineable high-volatile C bituminous coal seams at Coal Valley, heated in the outer foothills belt of the Rocky Mountain Eastern Slopes in west-central Alberta. Lexco Testing Ltd., the exploration arm of Luscar Ltd., owns and operates an all-weather geophysical logging system which provides gamma, focused density, single-point resistance and caliper logs in a single pass. A mathematical analysis for a theoretical interpretatio...
Publication: CIM Bulletin
Author(s): W. K. Smith, D. C. Mulder, V. P. Krueger
Keywords: Energy resources, Thermal coal, Coal deposits, Coal Valley, Luscar Ltd., Geophysical logging, Drilling, Coring, Sampling, Mapping, Resistance logs.
Issue: 779
Volume: 70
Year: 1977
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Summary: In order to raise the enormous amounts of capital which will be essential for the development of Canada's mineral and petroleum resources, this country's resource industry 'must be permitted to earn an acceptable rate of return. The existing tax regime, with its high rates, complexities and misdirected incentives, presents a serious obstacle to our resource industries in their development of Canada's immense, but increasingly lean, resources. Government tax and other policies are not the only...
Publication: CIM Bulletin
Author(s): R. D. Brown
Issue: 779
Volume: 70
Year: 1977
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Summary: Les mineralisations d'or des gites de la SOQUEM - Silver Stack dans le canton Bousquet se situent dans une bande de roches pyroclastiques acides du groupe de Blake River, d'dge archeen, dans le meme horizon geologique que les gites auriferes de Thompson Bousquet et Duma-gami situes plus a Vest. La propriete a ete exploree ante-rieurement a maintes reprises depuis les annees 1930, parfois jusqu'aux travaux souterrains, notamment par les groupes Mooshla, Warrenmac et Westwood Cadillac ainsi que...
Publication: CIM Bulletin
Author(s): Marc Filion, Clermont Lavoie
Issue: 779
Volume: 70
Year: 1977
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Summary: Pyroclastic rocks are useful guides to volcanic centers due to the tendency of their fragments to increase in size and volume toward the source vent. The felsic rocks of these centers can be the prime hosts of base metal deposits in the Precambrian Shield; their sub-volcanic equivalents are often the focus of porphyry copper mineralization in the Cordillera. Quantitative mapping of pyroclastic rocks has not yet developed into a routine prospecting tool in Canada, however, possibly due to the...
Publication: CIM Bulletin
Author(s): J. S. Fox
Keywords: Base metals, Exploration, Pyroclastic rocks, Volcanic centers, Down-plunge photography, Deformation ellipsoids, Size percentiles, Anderson Lake mine, Plin Flon South main shaft, Amisk Lake area.
Issue: 779
Volume: 70
Year: 1977
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