The Wunugetushan deposit is a large-sized porphyry copper-molybdenum deposit with pyrite as the most abundant metallic mineral. The average decrepitation temperatures of pyrite for three major ore-forming stages (molybdenum, copper, lead-zinc) are 331℃, 228℃and <200℃, which on the whole represent main ore-forming temperatures of three major mineralization stages. Pyrite is characterized by low Co (64.84×10-6) and Ni (15.6×10-6) but very high As (588.6×10-6),diametrically different from pyrite in porphyry copper-molybdenum deposits of China whereas similar to pyrite of sedimentary or stratabound origin in features of trace elements. This suggests to certain extent that some ore-forming substances of the ore deposit had nothing to do with mentle materials. Molybdenite, the only important molybdenum mineral, is dominantly of 2Htype and occurs mainly in the quartz-potash feldspathization zone.Different from most porphyry copper-molybdenum deposits in China, this ore deposit contains very low Re, implying not only high differentiation degree of the rock body but also the derivation of Mo from biotite granite of upper crust remelting origin. Copper minerals are mainly chalcopyrite and subordinately Zn-tennantite and bornite, which mainly occur in the quartzsericite-hydromus-covitization zone. The differences in trace elements of chalcopyrite of different generations reflect variation in ore-forming solutions. Galena and sphalerite mainly occur in the quartz-illite-hydromuscovite zone, with sphalerite deficient in iron (XFeS=4 mol%—8 mol%),and galena containing Ag(0.01%—0.35%).