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在加拿大，近51％的矿石是通过空场法采出的。在1988年对加拿大地下矿所做调查中发现，矿山关闭的一个重要原因就是不能控制贫化率。在使用空场法的地下矿中40％的矿山的贫化率超过20％。这里论述了涉及到研究和标定贫化的模型问题及其经济影响。贫化定义模型通常是通过综合处
In Canada, nearly 51% of the ore is produced by the open field method. A survey of underground mines in Canada in 1988 found that one of the major reasons for mine closures was the inability to control the rate of dilution. 40% of the mines using underground methods have a depletion rate of over 20%. Here we discuss the model problems involved in the study and calibration of depletion and their economic impact. The definition of dilution model is usually through the Department