Four economic porphyry copper-gold deposits, Endeavour 22, 26, 27, and 48, occur within the Late Ordovician Goonumbla Volcanic Complex of central-west New South Wales, Australia. Together these deposits have a combined ore reserve of 63.6 million metric tons (Mt) at 1.1 percent copper and 0.5 g/t gold. Mineralization is centered in narrow, pipelike quartz monzonite porphyry (QMP} intrusive complexes. We have recognized at least nine intrusive phases within the Endeavour deposits. These are, in order of emplacement, as follows: a premineral equigranular monzodiorite; early-mineral, equigranular to weakly porphyritic biotite quartz monzonite (BQM) stocks and dikes, synmineral K-feldspar QMP (K-QMP} pipes and dikes; late-mineral augite-biotite-K-feldspar QMP (KA-QMP) intrusions and biotite QMP (B-QMP) dikes; and postmineral basaltic trachyandesite dikes, augite monzonite porphyry dikes, and basaltic dikes. Early-stage biotite-magnetite and propylitic alteration of the host volcanic rocks and K-feldspar alteration of the BQM occurred at each deposit during the intrusion of the BQM stocks and early-mineral B-QMP dikes. Transitional-stage unidirectional solidification textures and other related anisotropic textures formed mostly during the emplacement of K-QMP and KA-QMP intrusions. Main-stage sulfide mineralization at all four deposits is spatially and temporally associated with. the K-QMP and, to a lesser extent, KA-QMP intrusions and their associated K-feldspar and sericite-hematite alteration. assemblages, and is characterized by multiple generations of stockwork and sheeted quartz, K-feldspar, bornite, chalcopyrite, and gold-bearing veins. Late-stage sericite-quartz-copper-sulfide-carbonate-hematite alteration and vein assemblages formed. prior to the emplacement of the postmineral intrusions. Weak to moderate postmineral propylitic alteration assemblages were the last alteration event related to the QMP intrusive complexes. Intrusive... [ABSTRACT FROM AUTHOR]