The discovery of the Bairendaba Ag-Pb deposit is the newest achievement made by the Inner Mongolia Bureau of Geology and Mineral Resources, and also serves as one of the typical case studies in the discovery of large-size Ag deposits by the integrated geo-physical-geochemical technique since 1950s when geophysical and geochemical work was started. Such an integrated geophysical-geochemical technique deserves wide application on the western slope of central and southern Da Hinggan Mountains in Inner Mongolia.