Abstract: According to the metallogenic type and distribution characteristics of ore in the Sijiaying Iron ore, on the basis of statistical analysis of total iron assaying datum, chose Kriging method, through variogram fitting, combined with ore grade distribution situation revealed by mine production, some reasonable estimation parameters were confirmed. Orebody solid modelling as a constraint, TFe grade distribution model which was consistent with production knows is established. It can reflect the distribution characteristics of grade well. Combined with mining situation model, it provides reference for stable ore removal and TFe grade in production.

Key words: Sijiaying iron ore, Kriging, Block modeling, Grade distribution