Abstract: Based on the geologic database of Jiajiabao, 3DMine software was used to combine samples and analyzed them by geological statistics. According to analyzed ore grade spatial variation, inverse distance squares method and ordinary Kriging method were used to make grade estimation for block model, then orebody resources reports were formed respectively. Two results of reserves calculation were compared, and application in resources management and mining design were discussed.

Key words: Geological statistics analysis, Inverse distance squares method, Ordinary Kriging, Reserves estimation, The variation function, 3DMine