Abstract: The tectonic mélanges in the Yagra copper deposit in Deqen, Yunnan consist of a series of tectonic slices that differ in age and composition. The Yagra copper deposit is mostly hosted to the Permian tectonic slices, which constitute the imbricate structures in the mining district. The late Yanshanian-Himalayan (tectonism) is manifested in the sinistral strike-slip faulting and porphyry emplacement, accompanied by copper and molybdenum mineralization.