Coaltech Research Association

Models for Predicting Methane Gas Release from Coal Seams

Alan Cook

Emission factors and calculation models for national greenhouse gas reporting, built from mine seam gas measurements and ventilation sampling, for environmental staff and inventory compilers.

What this report found

Emission factors derived from measured South African seam gas data give simple models for methane released by underground mining, surface mining and coal after mining. Applied across the industry they put total methane emissions at 52 000 to 93 000 tons a year. The models follow the IPCC Tier 2 approach using country specific factors.

R1500,00

Description

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Treatment of Sulphate Rich Effluents with the Combined Electrolytic/Biological Process

2003

Laboratory work on producing hydrogen by electrolysis as the energy source for sulphate reducing bacteria, aimed at cutting the running cost of treating sulphate rich mine water.

What this report foundHydrogen for biological sulphate removal can be generated on site by electrolysis more cheaply than it can be bought.

R1500,00

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What this report found

Hydrogen for biological sulphate removal can be generated on site by electrolysis more cheaply than it can be bought. Stainless steel electrodes in acid mine drainage gave hydrogen at about a third of the bought in price while oxidising ferrous iron to ferric, which helps downstream treatment. Iron and zinc electrodes dissolved too quickly to be viable.

Evaluation of Three Native Grass Species and a Tree Species for Coal Mine Rehabilitation

Martin Platt

2009

Field trials established on prepared topsoil at three Mpumalanga Highveld collieries and measured to 2007, covering survival, cover, biomass and tree growth, for rehabilitation planners.

What this report foundCynodon dactylon outperformed Themeda triandra and Hyparrhenia hirta, reaching 100 per cent survival and cover at all three trial sites by 2007 with or without...

R1500,00

R1500,00

Martin Platt

What this report found

Cynodon dactylon outperformed Themeda triandra and Hyparrhenia hirta, reaching 100 per cent survival and cover at all three trial sites by 2007 with or without fertiliser. Acacia sieberana reached 97 per cent survival at Kleinkopje Colliery but grew poorly at Optimum and Syferfontein. Planting plugs suits slopes too steep for a planter machine and buffers against pasture grass intrusion.

Detection of Old Workings

M van Schoo r

2008

Review of earlier geophysical work plus literature, setting out method selection and test site requirements ahead of field trials, for engineers assessing undermined ground before development.

What this report foundMicrogravity, resistivity based methods including self potential, and time domain electromagnetics are identified as able to detect and delineate shallow old...

R1500,00

R1500,00

M van Schoo r

What this report found

Microgravity, resistivity based methods including self potential, and time domain electromagnetics are identified as able to detect and delineate shallow old workings, with controlled source audio magnetotellurics useful below about 30 metres. How well each performs depends on target depth, the material filling the void and the overburden, and has never been quantified. Field trials were planned to close that gap.

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