Abstract: 3D ore deposit modeling is one of the core techniques for digital mine. Combining with the theory of the 3D ore-body modeling，an ore-body solid model on Ashele copper deposit is established，and then the ordinary kriging method is applied to estimate the reserves and grade distribution of ore-body.Finally，the spherical model for ordinary kriging estimation is obtained and 3D grade model of ore-body is established.The results indicated that the established model can accurately reflect the spatial and grade distribution of ore-body.It gives a mathematics model for further exploitation of mineral resources.

Key words: 3D ore deposit modeling, Geostatistics, Copper mine