Newly discovered Siruyidie’er copper polymetallic deposit is likely to change current situation that there are few large and mediumscaled copper deposits in South Xinjiang, and this has great significance for the study of mineralization in this area. The 32 copper orebodies and numerous mineralizedaltered spots have been determined and have huge metallogenic potential. The Siruyidie’er copper polymetallic deposit can be divided into south ore block and north ore block. The north ore block contains 13 cryptoexplosive breccia pipes, with disseminated chalcopyritization occurring in cryptoexplosive breccia pipes. In the south ore block, veintype chalcopyritization mainly occurs in contact zones of granite porphyry and wall rock, with veinlet and disseminated chalcopyritization developed in granite porphyry. These geological characteristics show that the Siruyidie’er copper polymetallic deposit is closely related to porphyry copper deposit. 40Ar/39Ar dating of metallogenic hydrothermal muscovite from the Siruyidie’er copper polymetallic deposit yielded a plateau age of 13.68±0.17 Ma, suggesting that the deposit formed in Miocene. Based on regional geological setting and tectonic evolution, this study suggests that the Siruyidie’er copper polymetallic deposit has a similar geological setting to the Miocene Gangdise porphyry Cu-Au deposits, both of which formed in a postcollisional extension environment of IndoAsian continent collision.