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JSIR Vol.63(11) [November 2004] >


Title: Predicting drainage quality for sustainable exploitation of coal
Authors: Siddharth, S
Jamal, A
Tiwary, R K
Dhar, B B
Keywords: Drainage quality
Mineralogical composition
Rock-pH
Pollution production potential
Acid neutralization potential
Total sulphur
Issue Date: Nov-2004
Publisher: CSIR
Abstract: In this paper, a technique has been suggested to know the quality of mine drainage even before the start of mining operation. The coal and associated rock samples are collected from the mine site. The mineralogical composition and geo-chemical character of each rock types occurring at the site are determined. The geo-chemical properties are measured in terms of R-pH, pollution production potential (PPP) and acid neutralization potential (ANP). The geo-chemical characteristics of various rock types indicate that they have different geo-chemical properties. There is a discrepancy in pH values obtained under laboratory conditions and field data and an explanation is given. On the basis of geo-chemical properties and weathering tests, it is found that except sandstone, all other litho-types such as, coal, shale, and shaly coal have the potential to deteriorate water quality and whatever the water pollutants present in the mine water are just because of interaction of these rock units with water. It is predicted that drainage from coal, shale, and shaly coal may be acidic, whereas drainage from sandstone is basic. The more or less same patterns are observed in the field. The technique suggested for the prediction of drainage quality may prove helpful and can identify rock types likely to produce water contaminants during their exposure to atmosphere in a mine.
Page(s): 919-926
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Source:JSIR Vol.63(11) [November 2004]

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