Geotechnical Design for Sublevel Open Stoping by Ernesto Villaescusa

By Ernesto Villaescusa

The 1st entire paintings on probably the most vital underground mining equipment around the world, Geotechnical layout for Sublevel Open Stoping provides issues in keeping with the normal sublevel stoping approach utilized by so much mining homes, during which a sublevel stoping geometry is selected for a specific mining process, gear availability, and workforce experience.

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Proceedings of the MassMin 2000, Brisbane, Queensland, Australia, October 29 to November 2, 2000, pp. 577–590, AusIMM, Melbourne, Victoria, Australia. 7 Idealized sketch and photo showing a stope diaphragm ring. , A review of sublevel stoping, in G. , Proceedings of the MassMin 2000, Brisbane, Queensland, Australia, October 29 to November 2, 2000, pp. 577–590, AusIMM, Melbourne, Victoria, Australia. 8 Firing sequence of a TUC with production rings in an open stope. , A review of sublevel stoping, in G.

In a steeply dipping orebody, where the critical stope boundary is usually an inclined hangingwall, transversally oriented slots are used to ensure sequential hangingwall exposure by the production rings. In large, massive orebodies, the choice of slot orientation is also controlled by factors such as fill exposures, stress regime, and preestablished access (Bloss and Morland, 1995). In general, a slot must be designed so that failure within the main or production rings is minimized. In highly stressed pillars, a slot can be oriented normally to the major principal stress to shadow the main production holes.

9–18, AusIMM, Melbourne, Victoria, Australia. ) two dimensions (along strike and down-dip). 23). A slot is created between the two horizons at one end of the orebody by enlarging a cutoff raise (or LHW) located near the footwall of the orebody. The slot created is used as an expansion void into which the remainder of the bench stope is formed by the sequential blasting of production holes. 24). 25). The likelihood of ore dilution increases if the ore is left within the stope floor for long periods of time and wall failures may cause ore loss or damage the mucking units.

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