Abstract:After more than 20 years of mining, Makeng Iron Mine has left a large number of unmined ore blocks, residual ore in the goaf, production pillars, security pillars, and unidentified ore bodies that have not been recovered. Through the investigation and comparative analysis of the mined-out area and geological reserves of the Makeng Iron Mine +200m above, a method of using the volume of the mined-out area to inversely calculate the amount of ore recovered, calculating the theoretical remaining reserves and comparing them with the actual remaining reserves, is proposed. The results of the comparison of ore output verify the feasibility and accuracy of the method, and provide a reference for other similar mines to verify the goaf and remaining reserves.