GEOLOGICAL FEATURES AND ORE-SEARCHING INDICATORS OF THE MAIDITIANXIN COPPER DEPOSIT IN YUNNAN PROVINCE

The small sized Maiditianxin copper deposit, located in Yangbi County, Yunnan Province, is mainly controlled by faults. The orebodies occur in the lower member of Jingxing Formation, Lower Cretaceous (K₁j¹). The ore veins are hosted in the medium-thick layered quartz sandstone, which is simply fading altered sandstone. The orebodies are small, with oxidation rate between 73.61% and 92.64%, belonging to high oxidation ore. By preliminary analysis, the genesis of the deposit is sedimentary-hydrothermal reformed type, closely related to the interbedded structural alteration zone in the "West Yunnan red beds".