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加拿大地下金属矿山的全部矿石产量中大约有51％是用空场采矿法开采的。这种采矿法要求在以可接受的最小贫化程度采出矿石之前，采场是空敞的。1988年对地下矿山的一项调查表明：这些矿山关闭的一个重要因素是贫化失控。据报道，有40％的空场采矿作业的矿石贫化超过20％，这样高的贫化程度对矿山的经济生存有深刻的影响，尤其当一个矿山企业的收益率一般要在10％～20％之间时，贫化问题更为敏感。本文对贫化的定义、现行的减少贫化的矿房设计方法、以及现时可用的贫化测定技术做了报道。
Approximately 51% of the total ore production in underground metal mines in Canada is mined by the opencast mining method. This mining law requires that the stope be open before the ore is mined to the minimum acceptable level of depletion. A survey of underground mines in 1988 showed that an important factor in the closure of these mines is the loss of control. It has been reported that 40% of the ore mined in the open pit mining work is depleted by more than 20%. Such a high degree of depletion has a profound impact on the economic survival of mines, especially when the return rate of a mining enterprise is generally 10% -20% %, The problem of depletion is more sensitive. This paper reports on the definition of depletion, the current design method for reducing depleted mines, and the currently available depletion determination technique.