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矿产资源体的形成受一定的成矿条件和控矿因素约束．这些约束条件可以分为成矿必要条件和成矿充分条件两大类．必要条件决定了资源体能否形成，充分条件决定了资源体的具体经济指标．利用某个成矿必要条件可把研究区内的所有单元分成“可能成矿单元”和“非成矿单元”两大部分．通过多个成矿必要条件的逐步筛选，又可从“可能成矿单元”中进一步提取“成矿单元”，从而实现矿产资源的定性预测．把所有单元通过如上所述的筛选过程并提取“成矿单元”的方法称为“筛选法”（ｓｉｆｔｉｎｇｓｃｈｅｍｅ）．在模型矿床存在的条件下，可通过充分条件在地质变量和资源量之间进行数字建模，并对未知“成矿单元”进行定量评价．研究表明，筛选法有可能为采矿企业提供更可靠的找矿靶区．
The formation of mineral resources body is subject to certain metallogenic conditions and ore-controlling factors. These constraints can be divided into two major categories of metallogenic conditions and metallogenic conditions. The necessary conditions determine the formation of resource body, sufficient conditions determine the specific economic indicators of the resource body. All the units in the study area can be divided into two parts of “possible metallogenic unit” and “non-metallogenic unit” by using the necessary conditions of a certain metallogenic process. Through the step-by-step screening of several ore-forming conditions, the “metallogenic units” can be further extracted from the “potential metallogenic units” to achieve the qualitative prediction of mineral resources. The method of passing all the cells through the screening process as described above and extracting the “metallogenic unit” is called the siftingscheme. Under the condition of the model deposit, the numerical modeling between geological variables and resources can be made under sufficient conditions and the unknown “metallogenic unit” can be quantitatively evaluated. Research shows that the screening method may provide mining companies with more reliable prospecting targets.