Grade Modeling And Pit Mining Dynamic Administration Of Qingshuigou Phosphorus Deposit

Aiming at realizing the pit mining dynamic administration and exploring the phosphorus resources scientifically and reasonably, geostatistics theory and methods are firstly applied to modeling on Qingshuigou phosphorus deposit. The main research work and results are listed as follow: (1) The original database of Qingshuigou phosphorus deposit, total 100 prospecting engineering and 241 lsamples P205 value, which can be used by mining production at random, has been established. (2) Through the general-statistical-analysis on the value of 2411 samples which include single samples and combined samples, it is concluded that the P205 value is normal distributed and value distribution is even. (3) The topography model and the lithology model of Qingshuigou phosphorus deposit are established, and the lithology value is estimated sectionally in one model. (4) After calculating and fitting on the variation function curves, it is found from the structural analysis of the variation function that the grade variation mathematical model value varies zonal anisotrapically, and the limiting variation distances in the direction of strike, dip, thickness of the ore body are respectively 220m, 350m, 200m. Cross testing and verifying shows that the result is less than the allowed error. (5) P205 and other components value model is established, more than 100 big scale unit maps of sections and planes, which are in great need by mining production, are plotted. (6) Ore reserves and mean value of different grades ore have been calculated by levels and by stopes. In the deposit, the reserves of the ore (P2O525%) 21,330,000 tons, the mean value is 29.54%; that of the ore (15%P2O525%) is 40,568,000 tons and 16.99%; Compare with traditional reserve estimation method, the relative estimation error is less than 15%. (7) The ratio of overburden of the north part to No.6 line is calculated. It shows that when the border value is 8%, the ratio of overburden is 0.1 9(m3/t); when the border value is 15%, the ratio of overburden is 0.5(m3/t); when the border value is 25%, the ratio of overburden is I .34(m3/t); when the border value is 30%, the ratio of overburden is 40.8 1(m3/t). (8) Pit mining dynamic administration is realized. After the establishment of the database, the database can be used by prospecting and mining at anytime.