Extended Ultimate-Pit-Limit Methodology for Optimizing Surface-to-Underground Mining Transition in Metal Mines

Table 2

Inputs for optimizing the surface-to-underground mining transition in the Dagushan iron mine.

(CNY·t^−1)	(CNY·t^−1)	(CNY·t^−1)	(CNY·t^−1)	(t·m^−3)	(t/m^−3)
100	20	13	72	4.1	3.9

Note. The variables of , , and have been explained in the definition for equation (1). is the cost for excavating unit quantity of ore by the underground method; and are the weight of ores and surrounding rocks, respectively.