Abstract: The performance of the 3D positioning and quantitative prediction of buried ore bodies based on 3D visualization technology seems to be a main means for predicting mineral resources. According to geoanomaly theory, under the guidance of the mineral exploration model, and by means of commercial 3D modeling software Micromine, the authors constructed topography, stratigraphy, structure, magmatite and project models, delineated eight prospect areas with the help of the traditional quantitative predicting method, and estimated gold deposit resources in the study area by using the method of abundance and volume. The contact ratios between known ore blocks and predicted blocks were calculated, thus quantitatively evaluating the validity of this prediction. The result shows that the Xiaoqinling gold belt in Tongguan still has a good potential for development and utilization and the 3D prediction method based on 3D visualization technology is very effective.