Failure mechanics and design considerations for footwall slopes

Abstract In bedded deposits such as coal or sedimentary iron, economic limits of mineable reserves are clearly defined by the f ootwall of the seams or ore-bearing units. Where open pits are developed in dipping strata, a long, high f ootwall slope may result. In many cases, unbenched slopes excavated along the base of the lowest mineable seam are operationally simple, economically desirable and geotechnically practical, although a variety of failure mechanisms may develop. This paper examines the engineering geology and rock mechanics parameters of importance in the design of footwall slopes. Possible failure mechanisms and stability analysis methods are described. Design considerations for benched and unbenched slopes are discussed with prime consideration given to development of long high slopes without benches or with a minimum number of benches.
Keywords: Rock mechanics, Bedded deposits, Open pit, Footwall slope, Benches, Unbenched slope, Failure mechanisms, Slope stability analyses, Slope design, Geotechnical assessments.
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Publication: CIM Bulletin
Author(s): A.L HOLLOWAY, N.M. SOONAWALA, LS. COLLETT
Keywords: Rock mechanics, Geotechnical engineering, Geophysics, Waste disposal, Nuclear fuel waste, Ground-penetrating radar, Radar, Granite rock.
Issue: 896
Volume: 79
Year: 1986
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Summary: Till geochemistry was the principal exploration tool employed by Selco in the investigation of a zinc prospect in Lanark Township, Ontario. The geochemical studies were undertaken after the discovery at surface of marble boulders containing bands of sphalerite and lesser amounts of galena.
The source of these mineralized boulders was sought by means of B-horizon soil geochemistry, followed, where appropriate, by back-hoe trenching and till sampling. The thickness of the till in this part of...
Publication: CIM Bulletin
Author(s): I.G.L SINCLAIR
Keywords: Exploration, Geochemistry, Soil geochemistry, Back-hoe trenching, Till sampling.
Issue: 896
Volume: 79
Year: 1986
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Summary: One approach to stabilization of rock slopes is to place a buttress at the toe of the slope to provide addtional resisting forces and increase the length and strength properties along the failure surface. This paper describes the rock mechanics and mine planning aspects of incorporating a buttress of intact rock in the lower part of the slope as part of the slope design for the south wall of the final pit at Cassiar Mine. "Stability analysis techniques and results are described. Analyses...
Publication: CIM Bulletin
Author(s): DENNIS C. MARTIN, TIM J. CAREW
Keywords: Rock mechanics, Slope design, Buttress, Mine planning, Stability analysis techniques, Slope stability, Cassiar Mine.
Issue: 896
Volume: 79
Year: 1986
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Summary: A shallow till sampling program was completed on a 1 km grid over the St. George Batholith in southern New Brunswick. The "B" soil horizon was analyzed for Cu, Pb, Zn, Ag, Co, Mo, U and Sb and the heavy minerals from the "C" soil horizon were ing the anomalous metal contents of overburden to their bedrock source. He is presently studying the metallogeny of an area in New Brunswick mapping the alteration halos around a porphyry copper system and determining the relationship...
Publication: CIM Bulletin
Author(s): V.N. RAMPTON, R.D. THOMAS, S. PARADIS
Keywords: Till geochemistry, Exploration, Shallow till sampling, Bedrock geology, Quarternary geology.
Issue: 896
Volume: 79
Year: 1986
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