Abstract:Bayin copper deposit locates in the southern margin of the middle section of medium Tianshan Mountains, the southeast margin of Yili mass, and south part of the Southern Tianshan zone. It is in the intersection part of Awulale mountain and Nalati mountain, and belongs to copper, nickel, gold mineralization belt of the Nalati. Its geological, tectonic characteristics are more complex with favourable metallogenic conditions. Through analysis on regional metallogenic background and geological characteristics of mining area, origin and ore controlling factors of the deposit have been summarized. It is confirmed that the mineralization can be divided into volcanovolcano hydrothermal type, vein rock type and hydrothermal vein type. The formation mechanisms of these 3 kinds of mineralization have close relation, and have close relation with late Silurian volcano activities. Combining with the proportion of various mineralized areas and the sequence of formation time, the origin types can be summarized as: Bayin copper deposit is mainly composed of the late Silurian marine volcanovolcano hydrothermal mineralization, and accompanied by late vein rock mineralization, and regionally composed of early Hercynian granitic magmatic hydrothermal superimposition reformation, middlelow temperature copper deposit. Main controlling factors of different types of mineralization are volcano activities, activity phases and the lithology, and faults also have certain control effect. Vein type mineralization is controlled by lithology and veins itself (exposed position and scale),Good mineralization appears generally in the vein rock with large scale or in the swollen part of vein rock. Hydrothermal vein type mineralization is mainly controlled by hornblende granite and their contact parts, regionally controllded by fracture belts in the late period. Ore bodeis are formed by filling functionalong the fracture zones.
