Long-Term Room and Pillar Mine Production Planning Based on Fuzzy 0-1 Linear Programing and Multicriteria Clustering Algorithm with Uncertainty

Table 8

Parameters of simulation.

Process	Value
Lead metal price; mean reverting process-monthly span	spot value (=0); 2361 $/t→range code 6→(2293 2381 2523) $/t; equilibrium; range code 4→(1963 2064 2134) $/t; speed of mean reversion 0.11251; volatility 0.18491
Zinc metal price; mean reverting process-monthly span	spot value (=0); 3060 $/t→range code 7→(2970 3244 3533); equilibrium; range code 4→(2095 2176 2260); speed of mean reversion 0.06133; volatility 0.16416
Operating costs; Itô-Doob stochastic process - monthly span	spot value (=0) 50 $/t; drift 0,0025; volatility 0,0125
Time span of simulation	(=1,2,…,60), T=60 months
Number of simulations	500