The Heiniudong copper deposit, situated in the Songpan-Ganzi orogenic belt, is the high copper content deposit which is located in the Jianglang metamorphic core complex. The 40Ar/39Ar plateau age of biotite is (136.43±0.77 Ma ), which shows that the Heiniudong deposit was formed in Middle Yanshannian periods. The mineralization characteristics and metallogenic epoch of Heiniudong deposit is the same with the Liwu deposit in the east of the Jianglang metamorphic core complex. We conclude the mineralization of the two copper deposit is related to the granitoids which formed the metamorphic core complex belt in the Songpan-Ganzi terrane. This discovery is of great significance both in theory and practice for finding copper deposits in the region.