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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4711

Title: Design of Merensky Reef crush pillars
Authors: Watson, BP
Kuijpers, JS
Stacey, TR
Keywords: Crush pillar design
Peak pillar strength
Residual pillar strength
In-situ measurements
Design charts
Issue Date: Oct-2010
Publisher: South African Institute of Mining and Metallurgy (SAIMM)
Citation: Watson, BP, Kuijpers, JS and Stacey, TR. 2010. Design of Merensky Reef crush pillars. The Journal of The Southern African Institute of Mining and Metallurgy, Vol. 110, pp 581-591
Series/Report no.: Journal Article
Abstract: The Bushveld platinum group metal deposits are two distinct, shallow-dipping stratiform tabular orebodies which strike for many hundreds of kilometres. Mining is extensive, with depths ranging from close-to-surface to 2 300 m. The mining method is a variation of planar open stoping. Pillars are widely employed to support the open stopes. In the deeper levels, in-stope pillars are required to fail in a stable manner soon after being cut, and the residual pillar strength is used to stabilize the hanging wall. These pillars are commonly known as crush pillars. Little work has been done in the past to determine pillar peak and residual strengths, and pillars have been designed using experience and formulae developed for other hard-rock mines. This has led to over and undersize pillars with consequential loss of ore, pillar bursts and potential collapses. This paper describes a crush pillar design methodology, and provides design charts. Three mining environments were incorporated in the investigations, which included underground and laboratory measurements, analytical solutions, numerical models and back analyses. The results of the study are suitable for the areas where the research was carried out, and may also be applied with caution in other similar environments.
Description: Copyright: 2010 Southern African Institute of Mining and Metallurgy
URI: http://hdl.handle.net/10204/4711
ISSN: 0038-223X
Appears in Collections:Mining and geoscience
General science, engineering & technology

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