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Geological Society, London, Special Publications; 2002; v. 198; p. 379-390;
DOI: 10.1144/GSL.SP.2002.198.01.26
© 2002 Geological Society of London

Influence of mine hydrogeology on mine water discharge chemistry

S. B. Rees1, R. J. Bowell1 & I. Wiseman2

1 SRK Consulting, Windsor Court, 1-3 Windsor Place, Cardiff CF10 3BX, UK brees{at}srk.co.uk
2 Environment Agency Wales, Penyfai House, Furnace, Llanelli, UK

Using data for 81 coal mine discharges in the UK, the influence of discharge hydrogeology on discharge chemistry is assessed and typical chemical parameters derived for five discharge types. A combination of modified and new classification schemes is used to differentiate between the various discharge sources. Drainage from spoil tips generally has a pH below 5 and net-alkalinity values as low as — 2500 mg l–1 CaCO3. Drainage from flooded workings and pumped discharges are net-alkaline, while drainage from flooded and free draining workings are either moderately net-alkaline or net-acidic. Iron is the major contaminant of concern, although many mine waters contain less than 30 mg l–1 and Fe/SO4 ratios are less than unity. The classification schemes developed can be used to assess mine water treatment requirements and processes operating in passive treatment systems.