沉积矿床,如煤、磷酸盐和天然碱蕴藏面积较大,须用数座矿山开采,因此,不同开采条件下确定矿山的规模和寿命对开发和经营的经济性是非常重要的。例如,矿山的设计能力过高将使大量的资金不能流动;矿区面积过大将减少工作面有效回采时间和增加矿山通风、地下物料运搬及道路维修方面的费用。另一方面,采区面积和储量过小就会出现频频建矿,增加了费用;竖井位置选择不当也会导致投资和生产费用增加。 Sedimentary deposits, such as coal, phosphate and trona, have large reserves and require exploitation by several mines. Therefore, determining the size and life of the mine under different mining conditions is of great importance to the economics of development and operation. For example, excessive design capacity of mines will make large amounts of funds unable to flow. Too large mining areas will reduce the effective mining face time and increase mine ventilation, underground material handling and road maintenance costs. On the other hand, if mining area and reserve are too small, frequent mining will occur, which will increase the cost. Improper shaft location will lead to increased investment and production costs.