Abstract: This paper attempts to use the ore-forming geological event method to study the problems regarding the evaluation of medium-scale regional ore potentials and mineral resources at depths and peripheries of the known mines. This method can be briefly summarized as follows: based on the reconstruction of the process of formation of related ore deposits and construction of metallogenic models, reconstruct some important ore-forming geological events and their evolution processes are reconstructed by tracing the tectono-deformation petrofacies in the ore sources series, study the distribution patterns of ore materials in a series of geological events and indicators and degrees of gradual ore material concentration and formation of ore deposits and further explore and direct evaluation of regional resource potentials, mapping and mineral exploration in ore deposit concentration areas. With this idea in mind, the authors studied the regional ore-forming geological events and geological mapping method in tin-polymetallic deposits in the central segment of the Nanling Mountains, South China, and the Jiaodong gold deposit concentration area, Shandong province.