Bio-indicators in Stockpiled Coal Mining Soils in South Africa
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Description
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A Preliminary Investigation Into the Geotechnical Interpretation of Geophysical Logs
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...
R1500,00
Geophysical logging of boreholes above three Witbank seams identified clay rich matrices, stiffness changes, bedding planes and the principal stress direction, and picked up fractures in 30 to 75 per cent of cases. Core logging found most of the same features faster, so routine use was not recommended unless stiffness and stress direction matter.
Stockpiling of Coal Mine Soils
2016
Physical, chemical and microbiological analysis of 257 unmined, stockpile and rehabilitated soil samples from four Witbank opencast mines, plus a pot trial on amendments, for soil handling planning.
What this report foundStockpiling degraded every soil property measured across four Witbank area mines. Clay content of topsoil and subsoil rose by 50 to 60 per cent, surface bulk...
R1500,00
Stockpiling degraded every soil property measured across four Witbank area mines. Clay content of topsoil and subsoil rose by 50 to 60 per cent, surface bulk density increased from stockpiling through to rehabilitation, and effective depth on rehabilitated areas was under 17 cm in most cases. Topsoil organic carbon fell by almost half and microbial species numbers dropped in the stockpiles.