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定性和定量地提出了“难选”的概念，并进行了讨论。指出了三种类型的难选矿石，即“本质上难选”（由于它们复杂的矿物组成），“经济上难选”（由于为达到所要求的精矿品位而进行加工处理和对废物的处理过程带来的高成本）和“环保限制难选”（由于处理过程中受到使用化学物品的限制或所产生气相、固相或液相废物排泄的限制）。阐述了一个定量描述的例子，这个例子是基于对不同硫化矿石的成像分析报告（Suterland等，1989，1991）。根据处理各种硫化金矿石的典型流程，阐述处理难选矿石的更加复杂性。
The concept of “difficult choice” was put forward qualitatively and quantitatively and discussed. Three types of refractory ore are identified, namely “essentially refractory” (due to their complex mineral composition), “economically refractory” (due to the processing and disposal of waste materials to achieve the required concentrate grade High cost of treatment) and “environmental restrictions difficult to choose” (due to restrictions on the use of chemicals or disposal of gas, solid or liquid waste generated during the treatment process). An example of a quantitative description is presented, based on an imaging analysis of different sulphide ores (Suterland et al., 1989, 1991). Based on the typical process for handling various sulphide gold ores, the more complex treatment of refractory ores is illustrated.