By Ernesto Villaescusa
The 1st entire paintings on the most very important underground mining equipment all over the world, Geotechnical layout for Sublevel Open Stoping offers issues in keeping with the normal sublevel stoping strategy utilized by such a lot mining homes, during which a sublevel stoping geometry is selected for a specific mining process, apparatus availability, and workforce experience.
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Additional info for Geotechnical Design for Sublevel Open Stoping
The use of conventional drawpoint geometries increases productivity. 11 Sublevel stoping in a steeply dipping tabular orebody. (a) Plan view—mucking horizon, (b) plan view—intermediate level, (c) cross section view—production rings, and (d) long section view. , 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. 2 Massive Orebodies Open stoping in large, massive orebodies consists of a mining sequence that requires several stages of stoping in conjunction with the application of delayed fill methods to enable pillar recovery.
The methodology consists of extracting stopes having either single or double drilling drives, depending upon their location with respect to the orebody abutment and with respect to each other in the extraction sequence. Alternating single and double drilling drives is likely to optimize hangingwall reinforcement as the extraction progresses up-dip. 22 Overall extraction sequence and cross section showing cablebolt reinforcement. , Extraction sequences in sublevel stoping, Proceedings of the 12th International Symposium on Mine Planning & Equipment Selection, Kalgoorlie, Western Australia, Australia, April 23–25, 2003, pp.
In addition, when the stopes are accessed centrally, drill design requires that the holes toe into any adjacent fill masses, thereby increasing the likelihood of fill dilution. 2 Production Rings A design stope shape is achieved by sequentially blasting rings of blastholes into the opening created by the initial expansion or cutoff slot. Stopes are usually sequentially sliced up, from sublevel to sublevel, firing rings toward the open cutoff slot. The production rings are sequentially blasted, attempting to minimize undercutting of the internal solid portion of a stope.