Abstract: A gold mine in Deqing County in Guangdong Province is a medium-scale tectonic altered rock gold deposit,it is another major gold deposit prospecting breakthrough in Guangning-Luoding metallogenic belt after Hetai large scale gold deposit is found.In order to study the ore characteristics and Au occurrence state of the deposit,systematic smapling work of the ores in minnig area is conducted and a lot of samples of ores are obtained,chemical multielement analysis,mineral component analysis,mineral scanning electron microscopy analysis and mineral microscopic identification or rock mass are done.The study results show that minerals of gold deposit is mainly for native gold,a small amount of black bismuth-gold ore and trace Jonassonite;the gold element in the deposit moves with reduced siliceous metallogenic fluid with the form of gold and bismuth solid solution and takes sulfur-bismuth complex as the carrier,then,the gold element is superimposed on brittle fracture interstices in ductile fault zone to separate sedimentary mineralization.

Key words: Tectonic altered rock gold deposit, Ore characteristics, Gold occurrence state, Native gold, Black bismuth-gold deposit, Prospecting breakthrough