The Upper lead-zinc deposit in the Jinsha mining district, Yongshan, Yunnan

The Jinsha lead-zinc mining district in eastern Yunnan cons is ts of Jinsha, Guanfang and Yanshan ore blocks. The ore bodies are mostly concent rated in the Upper Sinian Dengying Formation and Lower Cambrian Meishucun Format ion. The deposits here may be assigned to two types: the Upper deposit in black-phosphorite formation and Lower deposit in light-coloured carbonate formation. The results of research on ore formation, occurrence and morphology of ore bodie s, ore composition, texture and structure, in conjunction with the data on REE a nd organic geochemistry have led the author to conclude that unlike the Lower de posit, the Upper deposit is of sedimentary-diagenetic-organic origin.