Designing Optimal Strategies for Mineral Exploration by J.G. De Geoffroy

By J.G. De Geoffroy

Few an expert humans might deny that the sector of mineral exploration is dealing with a few tricky instances within the foreseeable destiny. one of the woes, we will be able to cite a world financial uneasiness mirrored via slow and from time to time generally fluctuating steel costs, international monetary uncertainties, and constant pressures on expenditures regardless of a considerable slowing down of the speed of inflation. moreover, administration is pressured to tum to extra subtle and costly applied sciences and to appear farther afield to extra distant areas, because the greater­ caliber and extra simply obtainable ore deposits have now been published. This fairly gloomy outlook should still convince explorationists to forged approximately for a brand new philosophy with which to steer mineral exploration throughout the demanding a long time forward. as soon as already, within the early Sixties, a choice for switch were heard (Ref. 30 in bankruptcy 1), while it grew to become seen that the prospecting tools of yesteryear, such a success long ago, couldn't stay alongside of the quickly starting to be call for for minerals of the postwar interval. the reply, a tremendous advent of refined geophysical and geochemical applied sciences sponsored by way of new geo­ logical types, proved spectacularly profitable during the Sixties and the Nineteen Seventies. yet for either monetary and technological purposes, the brisk speed 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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Another important directional consideration is the attitude of the detector with respect to the target. 2. 1. Nature of Geometric Parameters Describing Ore Deposits. The descriptors of the geometry of ore deposits may be grouped into two categories: dimensional parameters and attitudinal parameters. The dimensional 23 PROBABILITY OF DETECTION OF MINERAL DEPOSITS Slab Cylinder Truncated Ellipsoid Shape parameters Size parameters L B T =length T<:B<:L =breadth =thickness V = volume = kLBT A .. cross section area R, =B/L R2 ..

Detection is obtained from a horizontal plane, either the ground, or the flight plane for airborne 27 PROBABILITY OF DETECTION OF MINERAL DEPOSITS surveys. It is restricted to a specific vertical range below the observation plane, and involves the configuration of detector and ore deposit. 2. Vertical and Angled Direct Detection. We will first consider the case of vertical detection by drilling. The target geometry for detection purposes is defined by the dimensions of the vertical projection on the horizontal plane of the portion of the ore deposit which lies within the range of penetration of the probe.

The directional aspect of the target-grid relationship has to be considered. It is advantageous to lay a geophysical grid at right angles to the geological grain of the survey area, because there is a greater geological contrast across the strike than along it, thus enhancing the magnitude of the geophysical response. (12) However, we will find that the probability of detection of an elliptical target by a ground sampling survey on a square grid is maximized if the grid is orientated at angles varying from 18 to 45 degrees with respect to the long axis L, of the target, depending on the shape ratio R, of the target.

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