Abstract: Cores and samples contain abundant geological information and play a very important role in mine geological prospecting.On the basis of previous work, the author summarized the working methods for the secondary development and utilization of physical geological data and solved the geological problems in the mine, summed it up into a solid field geological work, discovering geological problems, re-analyzing the results and original data, and determining the ideas or methods of work; re-useing of physical data, extraction of geo-information; re-understanding of geological issues and achieving results.Taking Yankou Rock salt mine as an example, through the reuse of physical geological data, the cause of the deposit was determined, and the direction for further exploration was determined.This example shows that the scientific development of the existing geological cores and samples is an effective way to study deposit genesis and solve the prospecting problems with the continuous geological work.