By Alastair J. Sinclair
Utilized Mineral stock Estimation provides a entire utilized method of the estimation of mineral resources/reserves with specific emphasis at the geological foundation of such estimations, the necessity for and upkeep of a top quality assay information base, the sensible use of complete exploratory information assessment, and the significance of a finished geostatistical method of the estimation method. sensible difficulties and actual facts are used all through as illustrations. each one bankruptcy ends with a precis of useful matters, a few workouts and a brief checklist of references for supplementary learn. This textbook is appropriate for any collage or mining college that provides senior undergraduate and graduate pupil classes on mineral resource/reserve estimation.
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Additional resources for Applied Mineral Inventory Estimation
Bulk density (the all-too-common assumption that bulk density of mineralization remains constant throughout a deposit) 5. Geologic error, that is, errors in the assumptions of ore continuity and the geometry of a deposit 6. Mining method not adapted to the geometry of the deposit, that is, selectivity of ore and waste that is not optimal 7. Variable dilution from surrounding wall rock 8. ) 9. ). These factors can lead to both inaccurate estimates and imprecise estimates. Inaccurate results can be obtained very precisely, for example, if a bias (systematic error) is inherent in any one of the sampling procedures, the analytical method, or the data selection procedure.
5% Ni for drill hole No. 2% Ni for the diluting material. Assume further that mining will be constrained exactly between the dashed lines of Fig. 12. Estimate relative areas by counting squares with the transparent grid and use relative areas as weights. Using a similar counting technique, estimate the relative amount of ore left unmined between the two drill holes. In place of gridded paper, this problem could be solved using a planimeter or a digitizer and appropriate software. 4. A stope with rectangular outline on a vertical section has been deﬁned on the longitudinal section of a near-vertical gold–quartz vein cutting basaltic rocks.
2: Polygonal Methods Polygonal methods include a number of different approaches to the use of limited amounts of data to estimate individual polygonal volumes that have been deﬁned geometrically in one of several ways. In the case of polygonal methods in which there is no smoothing of the raw data, a single sample grade is assigned as the mean grade of a large block (polygonal prism) of ore or waste (Figs. 13). , the contained sample grade is extended to the polygon). Circles are data points; dashed lines join adjacent data points and form Delaunay triangles; thick lines deﬁning a polygon (Voronoi tesselations) are perpendicular to the dashed lines and divide the dashed lines into two equal segments.
Applied Mineral Inventory Estimation by Alastair J. Sinclair