As an important potential occurrence area of mineral resources, it is urgent to carry out systematic mineral resources potential evaluation and threedimensional space modeling research. Based on geographic information system (GIS) technology platform, a highprecision threedimensional geological model of abandoned openpit mines has been constructed, a spatial database by integrating multisource geological data has been established, and threedimensional visualization of ore bodies has been realized by using digital elevation model (DEM) and geological voxel segmentation technology. The improved Kriging interpolation algorithm is used to estimate the residual ore body in space, and the remaining resources are calculated intelligently with 3D analysis method. The research results can provide a dynamic monitoring technology scheme of remaining mineral resources in the mining area for the Department of Natural Resources. A threedimensional integrated decision support system of resource reservesspatial distributionecological restoration has been constructed. It can effectively solve the problem of distortion of ore body spatial form and statistical deviation of resource quantity by using traditional twodimensional estimation method. The application of this technology has realized the coordinated planning of economic development of mineral resources and ecological protection projects. It can provide a scientific basis for promoting the precise implementation of ecological restoration projects in mining areas, promote the construction of green mines, and expand the application scenarios of threedimensional geological modeling technology in the field of mineral resources exploration and evaluation.