MINERALIZING PROCESS AND PROSPECTING GUIDE OF JINBA GOLD DEPOSIT, SOUTHEAST YUNNAN

The Upper Permian and Lower Triassic strata and basic magmatism have provided ore-forming material for Jinba gold deposit in southeast Yunnan Province. The metallogenic fluids are derived mainly from Indosinian postmagmatic basic hydrothermal solution and partly meteoric water. The multistage inherited movement of the basement faults on the upwelling margin in Guixi depression supplied dynamics for the circulation and migration of ore-forming solution.The ore-forming solution from the deep crust upwelled and transported along the basement faults and associated fractures. The permeation and diffusion metasomatism resulted in the precipitation of gold in favorable positions of fold and fault structures in an enironment of high-permeable and readily soluble rocks and organic material riched reduced media.The primary gold deposit was then uplifted to the surface, and weathered to oxydized ore.