Abstract
Abstract The application of down-hole wireline logging techniques in the exploration for, and evaluation of, opencast coal reserves is described. The paper concentrates on the nuclear geophysical suite, in particular gamma and gamma-gamma logging which, to date, provide the most accurate geophysical means of identifying coal seams and estimating their thickness. The use of such logs in the identification of partings in coal seams, abandoned underground workings, sandstones, marine bands, ironstones and water levels is also described. The way in which such logs can be used in the correlation of individual coal seams is demonstrated, together with their use in the interpretation of geological structures in complex structural terrains. The advantages gained by the geophysical logging of boreholes far outweigh the increased costs incurred during exploration.
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