Characteristics of gold-bearing minerals at Honghuagou gold field in Chifeng area,Inner Mongolia

Research of mineral assemblages,occurrences of gold-bearing minerals in Honghuagou,Lianhuashan and Suohugou gold deposits from western Chifeng of Inner Mongolia and electron microprobe analyses of gold-bearing minerals and host sulfide minerals show that Au/Ag ratios of gold-bearing minerals reduced gradually with mineralization,and the ratios for inclusion gold is higher than those of fissure gold minerals. In general, gold-bearing minerals of high fineness have high contents of iron and bismuth, and the fineness might change with forming temperature of gold-bearing minerals. The analyses of bismuthiferous sulfosalt and aikinite coexisting with electrum in Honghuagou gold deposit show that orebodies rich in bismuth minerals usually rich in gold-bearing minerals,which could be taken as a mark for gold prospecting.