Abstract: The northern part of Lanping Basin in western Yunnan is an important copper-lead-zinc�silver polymetallic ore concentration area in the Sanjiang metallogenic belt. The cobalt geochemical anoma⁃ lies are widely distributed in the area，and the cobalt ore prospecting potential is good. In order to clarify the enrichment law，metallogenic mechanism and resource potential of cobalt-copper mineralization in this area，and provide a theoretical basis for subsequent exploration work，the cobalt-copper mineralization in the Biyuhe area of the northern Lanping Basin was taken as the research object，and the characteristics of cobalt mineralization and metallogenic regularity are studied by means of data collation，field geological survey，geochemical sample test and element cluster analysis. The results show that the cobalt ( copper ) mineralization in the area mainly occurs in the altered sandstone of the second member of the Middle Juras⁃ sic Huakaizuo Formation，and the wall rock alteration is mainly silicification，pyritization，chalcopyrite mineralization and tetrahedrite mineralization. The grade of Cu in the mineralization section is 0.8%~13%， and the grade of associated Co is 0.028%~0.57%. Cobalt element mainly exists in pyrite as isomorphism， and a small amount of sulfur-cobalt ore is wrapped in tetrahedrite in an euhedral granular form. The late Yanshanian tectonic movement formed the NW-trending fold and fault tectonic system in the area. The Hi⁃ malayan tectonic-magma activation promoted the migration and enrichment of polymetallic ore-forming ma⁃ terials. The ore-bearing hydrothermal fluid migrated and precipitated along the faults and secondary fis⁃ sures，forming a shallow source medium-low temperature hydrothermal vein type cobalt-copper polymetal⁃ lic deposit. According to the metallogenic conditions，geochemical anomalies and structural ore-control⁃ ling rules，two copper-cobalt prospecting target areas were delineated in Changputang-Biyuhe and Bai⁃ yangping-Qinguishan. Studies have shown that the northern part of the Lanping Basin has superior metallo⁃ genic conditions and great resource potential，which has favorable conditions for finding medium-large co⁃ balt-copper deposits.

Key words: Lanping Basin, cobalt mineralization characteristic, prospecting potential, middle-low temperature hydrothermal metallogenesis