The area of Gapjeong coal mine that closed according to the coal industry rationalization policy of the government in 1991 located in the longitude 128°09′58.8″ and latitude of 36°44′03.2″. The passive treatment system constructed in the area consist of an oxidation tank, SAPS tank, aerobic wetland. Coal mine water samples are collected from the passive treatment systems pond and the waterway in which leachate flew and temperature, pH and EC measured using instrument in sampling site. The mine water in passive treatment system shows pH range from 5.88 to 7.40 collected in April and 6.00 to 7.84 of October. The EC shows range from 776 to 1606μS/cm at the passive treatment system and leachate flew waterway. The highest concentrations of Mg, Ca, Mn, Fe are showing 64.52, 452.96, 5.58, 0.66mg/L in the pond and waterway, respectively. The precipitates of light brown(Munsell color 10R 6/10) and yellow precipitates(Munsell color 10R 8/7) consist mainly of goethite, ferrihydrite and schwertmannite. Fe, Mn, Pb concentration of leachate water decreases with distance from the waste piles.

Mineralogical studies of precipitates and geochemistry of passive treatment system in Gapjeong Coal Mine, Korea

255th National Meeting (2018)

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