Abstract:

 As a typical skarn deposit in the western Shandong Province, the Yinan gold deposit is becoming a serious crisis mine after more than 50 years of exploitation. The serious shortage of reserves turns the search for succeeding resources into a top priority. Relying on the project of mineral resource prediction on crisis mines, under the guidance of metallogenic system theory, the authors collected and repeatedly developed a large number of geological data, according to which the metallogenic geological conditions and orecontrolling factors were comprehensively analyzed, and the metallogenic laws were summarized. On the basis of largescale traverse geological survey and geological mapping, two forecast targets were selected in the periphery of the mining area. Combined with metallogenic prediction using targeted comprehensive methods including geology, geophysics, geochemistry, etc., industrial ore bodies had been found on the unconformity surface, providing new bases of succeeding resources for the mine and prolonging the mine life effectively. Successful orefinding by drillverifying in two predicted targets, in particular, the discovery of the unconformity related mineralization, not only suggests the huge oreforming potentials in deep and periphery of the Yinan deposit, but also is of great significance to the study of metallogenesis and exploration both in the mine and in the entire western Shandong Province.

Key words: comprehensive geologicalgeophysicalgeochemical methods, metallogenic prediction, metallogenic laws, unconformity, Yinan gold deposit, Shandong Province