Distribution Law of Coal-Type Uranium Resources in Yunnan Province

The coal-type uranium generally refers to uranium minerals occurring in coal seam uranium, generally the uranium content in coal is greater than or equal to 40 μg/g as its defining uranium resources standard. In order to summarize the characteristics of uranium content in coal in Yunnan Province and find out the distribution law of coal-type uranium resources. Through systematic review of 196 coal field exploration reports, the uranium content data of at least 208 coals of 109 boreholes in 12 coal mines were screened out. Combined with previous data, the uranium content data of at least 1044 coals in 23 coal mines were sorted out. Our statistical analysis shows that: (1) Uranium content in coal varies significantly and its distribution is extremely uneven. (2) The average uranium content in Triassic anthracite in Eshan Tadian is 27.6 μg/g, which is another rare anthracite uranium enrichment area newly discovered in China. (3) The Neogene lignite of Denggang coal mine in Luxi basin, Mengwang-Bangmai coal mine in Lincang basin, Dianwei coal mine in Jianshui, Kuazhu coal mine in Mile basin and southern Mengzi basin, with Permian lean coal and Neogene long flame coal in Qiuyan coal field in Wenshan, a total of six areas of uranium content in coal reach to the define standard of coal-type uranium deposits, especially in the Lincang basin group and Qiuyan coalfield own the most value in coal-uranium and polymetallic exploration and development. The preliminary analysis shows that uranium content in coal is not limited by coal rank and uranium source supply is the prerequisite for uranium enrichment and mineralization.