Abstract: Abstract:With the rapid development of domestic electronic technology , new energy technology and newmaterial teclmology ，the demand for industrial silicon is increasing grealy. Especially high purity ofquartz sand is difficul to be self-sufficient in China and needs a large number of imports every year.'There are large scale of quartz sandstone silica ore in northeast Yurmnan，which are mainly distributed inYiliang Coumty ，Daguan Coumty and Yanjin County d Zhaotong City. 'The ore-bearing strata are the mid-dle Devonian Suotoushan formation，which is characterized by large orebody scale，wide expased area.The thickness o the are deposit is stable and the oocurence fluctuation of its is small. Based on abun-dant field geological work and previous geological daa，this paper analyzes the geological characteristics( orebody characteristics,ore features , chenical composition，hoxse-stone in surrounding rock , genesis ofdeposit ) , mining techmical onditions , development status and development prospects of quartz sandstonesilica ore in the Suotoushan formation.

Key words: ｎｏｒｔｈｅａｓｔｅｒｎＹｕｎｎａｎ, ｑｕａｒｔｚｓａｎｄｓｔｏｎｅ, ｓｉｌｉｃａｏｒｅ, ｇｅｏｌｏｇｉｃａｌｃｈａｒａｃｔｅｒｉｓｔｉｃｓ, ｍｉｎｉｎｇｔｅｃｈ
ｎｉｃａｌｃｏｎｄｉｔｉｏｎｓ, ｄｅｖｅｌｏｐｍｅｎｔｐｒｏｓｐｅｃｔ