NE China contains 69 Mo and 9 Cu-Mo deposits with a total reserve of 10.5 Mt Mo The Mo-only and Mo-dominated deposits in NE China began to form in the Triassic. Porphyry Mo deposits aged > 160 Ma are Dabie-type formed in collisional orogeny. Mineral systems are a powerful indicator of tectonic setting and geologic evolution. Mongol-Okhotsk plate subduction caused the Great Hingan Mesozoic Igneous Province.