Coaltech Research Association

Multi-client Aeromagnetic Data Merge & Interpretation – Witbank Coalfield

S.J. du Plessis

Merged magnetic coverage and dyke interpretation across most Witbank mining and exploration ground, delivered as maps and GIS files for geologists planning around intrusions.

by S.J. du Plessis | February 2005

What this report found

Government and industry aeromagnetic data over the Witbank Coalfield were merged into one set of maps and GIS compatible files, and roughly 1200 dyke traces were interpreted from them. Purchase of a 200 m line spacing government survey removed the need for infill flying. One participating company valued advance knowledge of a single underground dyke at about R15 million.

R1500,00

Description

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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...

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What this report found

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.

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Groundwater levels and pumping records from five rehabilitated opencast pits at South African collieries, for hydrogeologists and closure planners estimating post-mining water balances.

What this report foundRecharge factors of 23.5 per cent and 12.9 per cent were calculated at the two rehabilitated pits with complete data.

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What this report found

Recharge factors of 23.5 per cent and 12.9 per cent were calculated at the two rehabilitated pits with complete data. The higher value reflected surface drainage towards the pit centre and eroded topsoil; the lower one, a deep pit floor with well compacted spoil and intact cover. The rates are site specific and no generic formula could be derived.

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