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Lesley S Jeffrey

2 reports in the library

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Lesley S Jeffrey
2004
Compares a full suite of downhole sondes against geotechnical core logging over the 5 m above three coal seams, for geologists and rock engineers assessing roof conditions.
What this report foundGeophysical logging of boreholes above three Witbank seams identified clay rich matrices, stiffness changes, bedding planes and the principal stress direction...
Integrated Mining and Processing
A Preliminary Investigation Into the Geotechnical Interpretation of Geophysical Logs
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Lesley S Jeffrey
2000
Geology and Geophysics
Critical Geotechnical Factors Impacting on Reserves in Previously Mined Areas in the Northern Witbank-highveld Coalfield
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A Preliminary Investigation Into the Geotechnical Interpretation of Geophysical Logs