De Frey in his report of mine design alternatives for the DEEPMINE project found that the small span small pillar (SSSP) concept, as a mining method for deep mines, from a rock engineering point of view, had certain positive advantages. The main advantage was the possible control of seismic activities in deep mines (de Frey:1999).
Because it had not been used in deep hard rock mining, it was decided to examine the criteria put forward as possible showstoppers by comparing the other four mining methods presently used, with the SSSP design (Vieira, Diering and Durrheim: 2000). These were longwall with strike stabilizing pillars (LSP); sequential grid method (SGM); sequential down dip method (SDD); and closely spaced dip pillar method (CSDP).
Reference:
De Frey, FSA, Handley, MF and Webber, RCW. 2002. Examine the criteria for establishing the small span small pillar concept as a safe mining method in deep mines,Volume 1 of 1. Safety in Mines Research Advisory Committee, GAP 822, January, 2002, pp 1-81
De Frey, F., Handley, M., & Webber, R. (2002). Examine the criteria for establishing the small span small pillar concept as a safe mining method in deep mines,Volume 1 of 1. http://hdl.handle.net/10204/1884
De Frey, FSA, MF Handley, and RCW Webber. "Examine the criteria for establishing the small span small pillar concept as a safe mining method in deep mines,Volume 1 of 1." (2002): http://hdl.handle.net/10204/1884
De Frey F, Handley M, Webber R, Examine the criteria for establishing the small span small pillar concept as a safe mining method in deep mines,Volume 1 of 1; 2002. http://hdl.handle.net/10204/1884 .
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