The Tinggong copper deposit in Nimu County,Xizang Province is located in the eastern section of Gangdise por-phyry copper belt,which has become an important area for studying the genesis and prospecting indicators of porphyry cop-per deposits because of its unique geological structure characteristics. The formation of this deposit is closely related to Mio-cene magmatic activity,and magmatic intrusion provides material basis for mineralization. The geological structure back-ground of the mining area,especially the fracture and surrounding rock alteration,created favorable conditions for the mi-gration and precipitation of mineralized fluids. Potassic silicification and pyritic sericitization played an important role in the mineralization process. Potassic silicitization provided a channel for the migration of ore-forming fluids. The pyritic sericiti-zation alteration may be the direct cause of the precipitation of copper and other metal elements. The geophysical character-istics of the mining area reveal the electrical difference between the mineralized body and the surrounding rock,which pro-vides important information for deep prospecting. In addition,mineralization outcrop,porphyry of specific lithology and scale,alteration of surrounding rock and geophysical anomaly of mining area can be used as direct or indirect prospecting indicators in this area.
nimu county,Xizang provinceporphyry copper minesurrounding rock alterationgenesis of depositprospecting mark
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