Planning Tunnel Construction Using Markov Chain Monte Carlo (MCMC)

Table 2

Summary of statistical adjustment for unit operation.

Unit operation	Parameters								Probability Distribution
	Used data	Mean	Median	Mode	Standard deviation	Coefficient of variability	Minimum	Maximum
Drilling	137	195.45	193.89	190.23	38.08	0.19	70.98	392.79	Beta
Load and blasting	133	56.09	55.76	54.98	11.64	0.20	14.77	113.51	Beta
Ventilation	136	90.00	90.00	90.00	0	—	—	—	Constant
Scaling	135	26.08	25.24	23.54	6.77	0.25	8.04	—	Lognormal
Mucking	135	70.03	65.66	58.33	20.22	0.28	30.95	—	Gamma