Mining of residual ores in old goafs is a very complicated engineering. On basis of field investigation results of practical mining of residual ores in old goafs of FengHuangShan Limited Liability Company, using fuzzy optimizations, theoretical analyses, numerical simulations and industrial tests, optimal problems of residual ores mining are studied deeply. The main contents and conclusive results are as follows:
(1)In the process of field investigations, guided by the in-situ experienced geological eng...