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By J.G. De Geoffroy
Few an expert humans could deny that the sphere of mineral exploration is dealing with a few tough occasions within the foreseeable destiny. one of the woes, we will cite a world fiscal uneasiness mirrored via gradual and from time to time generally fluctuating steel costs, international monetary uncertainties, and constant pressures on expenses regardless of a considerable slowing down of the speed of inflation. moreover, administration is pressured to tum to extra subtle and dear applied sciences and to appear farther afield to extra distant areas, because the higher caliber and extra simply obtainable ore deposits have now been published. This fairly gloomy outlook should still convince explorationists to solid approximately for a brand new philosophy with which to lead mineral exploration in the course of the difficult a long time forward. as soon as already, within the early Nineteen Sixties, a decision for switch have been heard (Ref. 30 in bankruptcy 1), while it turned noticeable that the prospecting tools of yesteryear, such a success some time past, couldn't stay alongside of the swiftly growing to be call for for minerals of the postwar interval. the reply, an enormous advent of subtle geophysical and geochemical applied sciences sponsored via new geo logical types, proved spectacularly winning through the Sixties and the Seventies. yet for either fiscal and technological purposes, the brisk velocity of the final 20 years has significantly bogged down within the early Eighties, as though a brand new threshold has been reached.
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3. Statistical Modeling of Geometric Parameters. Because the geometry of the expected prizes is not known beforehand, we have to rely on probabilistic estimates of geometric parameters which are derived by the statistical modeling of known ore deposits of the same genetic type as that of the expected target. The purpose of model fitting is to establish on the basis of statistical tests (x-squared goodness of fit tests) which theoretical model best describes the observed frequency distribution of parameter measurements obtained from known ore deposits.
If Pp' P s, P r are the probabilities of detection of a target of specified shape R by surveys on parallel, square, and rectangular grids, the expression relating the three is written as Pr = (l - w)Pp + wP s where w is the grid shape ratio in the interval 0-1. 4. Probabilities of Detection of Oriented Targets of Varied Shapes by Airborne Surveys on Parallel Grids Agocs' and McCammon's studies on which the above is based considered only the case of randomly oriented targets. Chung(32) was the first worker to consider the effect of target orientation on the probabilities of detection of linear targets by continuous sampling surveys on parallel grids.
When "potential field" methods (gravity, magnetics, radiometrics) are used, a large portion of the signal intensity consists of an "edge effect" generated by the contrast, while the remainder is attributed to a "volume effect" reflecting the intrinsic geometry of the mineral deposit. Through mathematical processing involving the calculation of the second derivative of the potential functions, such as "continuation," which can be applied to all three methods, or "reduction to the Pole" for magnetic surveys only, it is possible to ensure a very close spatial coincidence between signature and causative body.
Designing Optimal Strategies for Mineral Exploration by J.G. De Geoffroy