Abstract: present,most of the small and mediumsized old mines in China are facing a series of problems,including the lack of data that cannot accurately determine the location of old minedout areas and remaining resources,cannot accurately grasp the remaining resource forms and recoverable amounts,recycling scheme design cannot match actual resources,etc.The above problems can be solved through the application of 3D detection and modeling technology in the accurate positioning and recovery scheme design of old mine residual mineral resource.Taking Pinfeng SPbZn Mine of Fuchen County of Fujian Province as an example,by using threedimensional laser scanning technology to construct a threedimensional model of the goaf in the old goaf,combined with the threedimensional modeling calculations,the threedimensional model of recyclable residual mineral resource is established.Through model division and cutting,according to the actual shape of the ore body,the cutting and perforating works are arranged in the 3D model,and then imported into the plane construction drawing,which reduces the design workload,and the scheme can accurately match the ore body and reduce the design deviation.Due to the existence of a large number of old minedout areas,in order to ensure safety,based on an accurate threedimensional model of the minedout area and remaining resources,a stable monitoring plan for the minedout area was developed,and monitoring sensors were deployed to ensure recovery safety.

Key words: Old mine,Goaf,Residual mineral resource,3D detection and modeling,Threedimensional laser scanning,Recovery scheme