Abstract: The Aijingshan strontium deposit in Lishui District,Nanjing City is the only strontium deposit currently being mined in Lishui Volcanic Basin of the Middle and Lower Reaches of the Yangtze River Metallogenic Belt. The Sr Ⅱ veinshaped orebody is the main orebody of the deposit. In actual exploration and mining processes,it has been found that the distribution characteristics of Sr Ⅱ orebody is sometimes inconsistent with exploration data,which restricts the layout of exploration engineering and mining progress. Taking the being mined -230 m section of the deposit as an example and combined with the relevant investigation results of the distribution of hidden fault structures,the structural characteristics,attributes,and formation sequence,as well as the control of the structures on the orebody are analyzed in the paper. It is believed that the early NW oriented F2 and F7 fault structures in the ore district were not only ore-guiding structures,but also ore-controlling structures,and separately control the lower and upper boundaries of the orebody. Affected by multiple periods of regional tectonic activity,near EW trending thrust,compressive or translational fault structures derived from NW trending fault structures are main fault structures that cause the swelling and shrinking,branching and recombination,and pinching out and reappear of the formed orebody,which are ore-breaking structures. The NE open fault structures derived from NW trending fault structures with a small scale have minimal damage to the orebody. Based on the changes in geological characteristics of wall rocks and orebodies,as well as the hidden structural control laws mentioned above,significant progress has been made in the exploration practice. Strengthening the analysis of the hidden fault structural control laws would have an important significance for effectively improving the prospecting prediction. 

Key words: strontium deposit,geological characteristics of orebody,hidden fault structure,prospecting prediction,Lishui volcanic basin ,