THE ORE COMPOSITION AND GOLD OCCURRENCE STATE OF GONGDING GOLD DEPOSIT IN CANGYUAN YUNNAN

Gongding gold deposit belongs to the type of quartz vein. Through the studies of back scatter scanning electron microscope, electron microprobe and plasma spectrum and so on, the authors have found out that the gole-earring minerals are pyrite, arsenopyrite,galena, sphalerite etc.,fine grain-micrograin native gold is the main occurrence form of gold. Zinc-elec-trum variety is first reported and the gold metallogenic machanism is also discussed in this paper.