Operational Efficiency Forecasting Model of an Existing Underground Mine Using Grey System Theory and Stochastic Diffusion Processes

Table 19

DOL’s indications.

Parameter	DOL value
	High	Low
Variable costs (revenues and fixed costs are fixed)	High	Low
Fixed costs (revenues and variable costs are fixed)	Low	High
Revenues up (variable and fixed costs are fixed)	Greater profits	Lower profits
Revenues down (variable and fixed costs are fixed)	Greater losses	Lower losses