Borehole A passes through a coal seam at a depth of 50 m and reaches a lower
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Borehole A passes through a coal seam at a depth of 50 m and reaches a lower coal seam at a depth of 450 m. Boreholes B and C reach the lower coal seam at depths of 150 m and 250 m respectively. Assume that the two coal seams are planar and very thin, that is, at the given scale they can be represented by a single line on the map. Also assume that the two coal seams have a constant vertical separation of 400 m.
a) Determine the strike and dip of the lower coal seam.
b) Map the outcrops of both lower and upper coal seams using a 50-m structure contour interval .
c) Colour and label areas where the upper seam is at a depth less than 150 m below the ground surface
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ISBN: 9781506388595
1st Edition
Authors: Alfred A. Marcus, Timothy J. Hargrave
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