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2003
Usher, B. H., Hodgson, F. D. I.
Twenty-seven observation test pits were excavated at four different spoils dumps at three collieries in the Witbank Coalfield. The holes were dug into the upper three metres of the spoils to ascertain if any weathering profiles, variation with age or influence of topsoil covering could be gauged....
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2003
Usher, B., Cruywagen, L-M., de Necker, E., Hodgson, F. D. I.
The acid mine drainage (AMD) situation at three opencast collieries in the Witbank Coalfield, South Africa, was evaluated from different perspectives. Twenty-seven test pits were dug into the spoils of these collieries to characterise the in situ conditions of spoils of varying age. Detailed...
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2003-01-01
Cruywagen, L-M., Usher, B. H., Hodgson, F. D. I., de Necker, E.
Due to the haphazard application of static tests in South Africa, several methods and interpretations have been followed. This has resulted in confusion amongst practitioners and regulators in the use and validity of these methods. Research was done over a two-year period to define standardised...