Abstract:The Luoboling porphyry Cu Mo deposit is located in the northeast of the Zijinshan ore field. It is generally a buried porphyry Cu Mo deposit, which is associated with the late Mesozoic granodioritic porphyry. In the deposit, major porphyry orebodies, with the ore mineral assemblage of chalcopyrite molybdenite, occur in the chlorite phyllic and weak potassic phyllic alteration zones. The minor transitional orebodies, characterized by the digenite covellite molybdenite assemblage, are hosted in the advanced argillic alteration zone. The statistics of fissures on outcrops in the Luoboling deposit indicate that late stage ore bearing fissures of porphyry mineralization have obvious directionality. And the ore bearing fissures away from the porphyry intrusion show almost the same trend to the nearby regional faults and rocks, implying the significant structural controls by regional NE trending faults, while the fissures closed to the porphyry intrusion show radial distribution due to the impact of porphyry intrusion. Deep concealed ore bodies are under the dual control of regional faults and granodiorite porphyry intrusion. In the vertical, from deep to shallow, Cu Mo mineralizations show a zonation of Mo (Cu, Mo) Cu(Mo), with gradually increasing Cu/Mo ratios. On the plane, Cu and Mo are evidently enriched along the NE and NW trending faults and contact zones of granodioritic intrusions. The porphyry Cu Mo orebodies mainly occur in the granodioritic porphyry circling around the weakly porphyritic granodiorite, with shapes and occurrences mainly controlled by faults and the contact zones of granodioritic intrusions, and the digenite orebodies occur in the outer contact zone of the granodioritic porphyry, with shapes and occurrences consistent with those of the contact zone. Regional structure and porphyry intrusion have different influence on the porphyry Cu Mo mineralization. The Cu Mo mineralization at higher elevations is significantly affected by regional tectonic faults, however orebodies at lower elevations are controlled by both the granodioritic intrusions and faults. Regional NE striking anticline and faults controlled the emplacement of granodioritic intrusions, while the mine scale NE striking faults affected the emplacement and mineralization of the porphyry, and the granodioritic porphyry and their contact zone directly controlled the porphyry orebodies. These metallogenic rules are important for the exploration of the concealed porphyry orebodies in the deep and periphery of the Zijinshan ore field.