Computer simulation of grade distributions in iron ore deposits: a tool for grade control planning

CIM Bulletin, Vol. 76, No. 858, 1983
MICHEL DAGBERT, GILBERT SERGERIE, PIERRE ANTOINE DHAITI and JEAN-MAURICE BRODEUR, Geostat Systems International Inc., Montreal, Quebec, Canada
Abstract Quality of iron ore is generally determined by several factors which can be correlated or independent. Among these factors, we generally find per cent iron, silica, magnetite or hardness. Forecasting the short- and long-term fluctuations of these factors in the future pit is an important feature of mine planning in these deposits. Computer simulation provides a realistic answer to these questions. It allows to generate values for the most important quality features of each shovel load with the proper correlations between them as well as between one load and the next being fully reproduced. Then different sampling schemes for grade control or blending facilities can be examined on the simulated data. The mechanics of the simulation procedure and its potential applications are described in an example.
Keywords: Computer simulation, Iron ore deposits, Grade control, In-situ grade simulation, Geostatistics, Histograms, Variograms
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