Abstract: In order to enhance the accuracy of reserves estimation，analyze the influence of the determination method volumetric weight of ore on reserves estimation，a new determination method of volumetric weight of ore based on interpolation method is proposed.Firstly，based on the prospecting data and prospecting line profile maps of an iron & copper mine，by graphics format conversion and coordinate transformation，the three dimensional geological model of part of the orebody of the iron & copper and the geological database are established；secondly，the ore samples are grouped，and the distance power inverse ratio method is adopted to estimate the grade of orebody；thirdly，based on the test values of orebody samples weight and grade，the linear regression model，quadratic regression model，cubic regression model and logistic regression model interpolation model of volumetric weight of ore and grade are established.Through analysis and comparison，the quadratic regression model is identified as the volumetric weight of ore;finally，the interpolation of volumetric weight of ore is conducted within the three dimensional geological model of orebody，and the reserves are estimated.The reserves estimation results are analyzed，and comparison between the reserves estimation results and the traditional determination method of volumetric weight of ore is conducted.The results show that the difference of the above methods is less，and the average grade of ores estimated by the new method based on interpolation method is slightly higher than the traditional method.Therefore，the method proposed in this paper can provide some reference for enhancing the accuracy of reserves estimation.

Key words: Volumetric weight of ore, Reserves estimation, Interpolation, Three dimensional geological model, Regression model