As the conventional rare metal deposit is gradually depleted, it is very necessary and important to explore new types of rare metals ore to fulfill the world demands. In coal or coal-bearing stratum, some elements especially critical elements like rare earth elements (REE), Ge, Li, etc., are enriched under some unique geological settings. Thus, coal or coal-bearing stratum which can be considered as the alternative materails for critical elements has attracted much attention. So if anomalies of critical elements in coal or coal-bearing stratum are above the cut-off grade of respective and can be developed economically under the current techniques,