Application of the‘Deduction-Iteration’Exploration Method to Large-Scale Metallogenic Prediction:An example from the Shizhaigou Gold Ore District in Henan Province

The‘deduction-iteration’exploration method involves five steps of induction,deduction,inversion,verification and iteration.It can effectively combine the metallogenic prediction theory with large scale metallogenic prediction.‘Induction’means comparative studies of the typical deposits,analysis of regional ore-controlling structures and summarizing regional ore-forming regularity.‘Deduction’ builds a metallogenic model based on its own ore-forming and ore-controlling characteristics in a mining area.‘Inversion’can effectively locate the positions of ore bodies and deepen the recognition of the ore-forming features by the methods of geology,geophysics and geochemistry.‘Verification’converts the prospecting work into physical achievements.‘Iteration’ builds a circle of the prospecting work,and it will approach the real ore-forming evolution mechanism,and expand the space of ore bodies with constantly promoting of the circle.Taking the Shizhaigou gold mine as an example,guided by the theory of‘metallogenic series’and the regional ore-controlling structure model of‘metamorphic core complexes’,the comprehensive geophysical prospecting methods including gamma-ray survey,magnetic survey and the high-density resistivity method were used in the prospecting work.The promising mineralizing region was predicted by the geophysical anomalies interpreted with the geological information and verified by drilling.