Metal mineral types and distribution characteristics in coal in Northern China

Multiple metal mineral resources are widely distributed in coal measures closely related to the coal genesis in Northern China. Through the investigation and study of the coal measure mineral resources,the types and distribu- tion characteristics of the coal measure metal mineral in Northern China were discussed. ① Metal mineral in coal measures is a new type of metallic mineral,which has the characteristics of stable distribution and large reserves. It can often form the large or very large metal deposits. According to the occurrence of this type of minerals and the co-rela- tionship with coal,the deposit types can be divided into three types:coal type bulk metal deposits,coal type rare metal deposits and coal type radioactive deposit. ② The spatial and temporal distribution of the coal measure metal mineral are certain in North China,and the metallogenic epoch was limited in the carboniferous-Permian coal forming period, in other coal forming period,the metal mineral deposit in coal measures was not formed. Coal measure Lithium which can reach the industrial grade is only in the No. 6 coal seam in Heidaigou and Guanbanwusu in Jungar coalfield and in the carboniferous-Permian coal seam in Antaibao mining area in Pingshuo. Anomalous enrichment of Gallium in coal measure only exist in the carboniferous-Permian coal seam in the east Ordos basin such as Datong,Pingshuo,Xishan, Liulin,Yangquan. High alumina coal mainly distributed in the carboniferous-Permian coal seam in Inner Mongolia and Shanxi,and because of the transportation distance with Yinshan northern provenance,the trend of the content of Al2 O3 in coal ash in north is higher than south in the plane. Coal measure iron distributed in individual coal mining area in Southwest of Zhuozishan coalfield,and the Coal-bearing deposition is comparable to the Yanghugou Goupe (northwest type). The distribution range and resource reserve of coal measure iron is limited,but it represents a new type of metal in coal measure.