Ore character of Xinjinchang gold deposit, Gansu

The Xinjinchang gold deposit is a middle scale altered rock-type gold deposit with high oxidation.The ore body is controlled by the fault fissure strictly and occurred in the diabase.The chemical analysis show that the useful composition in the ore is simple,harmful composition is lack and the major gold mineral is silver-bearing nature gold. The major metallic minerals and also the major gold carrier minerals are pyrite and limonite; the nonmetallic minerals are quartz, feldspar and chlorite. The automorphic, hypidiomorphic and xenomorphic granular textures are the main ore textures and vein and brecciated structures are the main ore structure. 147 pills nature gold are obtained by artifical panning and its forms are honeycomb,dendritic and irregular granular et al.Gold occurs mainly in shape of fissure gold,the secondly is interparticle gold, and inclusion gold takes only about 10%. The nature gold is in microsize.The major type is quartz vein-cataclassic altered rock-type, the limonization, pyritization and silication are strongly in the fracture zone, and the secondary oxidation is less stronger.