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As increase of coal comprehensive utilization, it is urgent to establish comprehensive utilization grades of some trace metal elements in coals in order to taking comprehensive evaluation measures in coal exploration stages and to decrease the exploration cost. High concentrations of trace elements in coal seams were reported by several papers in recent years. In this paper, the comprehensive utilization grades of Li, U, Th and REE were suggested by compared their enrichments in coal with the Geology and Ore Deposit Standard Specifications in rocks for Rare Metal Mineral Exploration of the People's Republic of China (DZ/T 0203-2002), and also compared with the minimum mining grade for Ga and Ge in coals. The author suggests that the minimum mining grades of Li, U, Th and REE should be 120, 40, 150 and 300 mg/kg, respectively. [ABSTRACT FROM AUTHOR]