On the rapid-positioning and prediction for micro-dissemination type (sedimentary rock host) gold deposit (ore bodies), Ma’anqiao

Ma'anqiao gold deposit is one of mast important gold deposits, occurring in sedimentary strata, in the middle-west part of Qinling——"Central Orogen", China and reaches into a large scale in reserves; and its potential of resources adds year after year. The gold deposit has typical significance in the metallogenic mechanism and evolutionary pattern and can be compared with well　known gold deposits of the samp type at home and abroad. Major achievements of the study are as follows.