Abstract
The common practice in AMD prevention is a dry cover technique. In this technique, rock that is potential in producing acidity (PAF) will be placed below non-acid producing rock (NAF). Depends on NAF availability in the mine site situation, organic covers can be used to prevent diffusion of oxygen into reactive sulphide wastes and subsequently to eliminate sulphide compounds oxidation and generation of acidic waters. The utilization of additional material cover layer is proposed, by using fly ash and organic material combination. To investigate the possibility of using these materials, a column leaching test in the laboratory scale was conducted with several scenarios of simulation. By comparing between column with different thickness of fly ash and organic material, the leachate water behavior is observed in the experiment, including the measurement of water quality (pH and EC), major cations-anions. The result suggests the possible thickness of fly ash (FA) and organic material (OM) as cover layer material, especially in the case of mine with domination of PAF rock material.
Highlights
Coal mining is one of the major parts of mining sector that provide worldwide energy
The result suggests the possible thickness of fly ash (FA) and organic material (OM) as cover layer material, especially in the case of mine with domination of PAF rock material
The current research proposed the application of fly ash and organic material as dry cover system to mitigate acid mine drainage generation especially to improve water drainage in mine site
Summary
Coal mining is one of the major parts of mining sector that provide worldwide energy. Dry cover is considered as the most effective method to minimize penetration of air and water (O’kane & Wels, 2003; Wilson et al, 2003). It is an inexpensive method and moderately simple to be constructed, as the cover layer usually depends on the material availability on the mining site. The numerous mining sites already applied this method in their field while several researches were conducted to study about the efficiency and long-term impact of dry cover to AMD (Gautama et al, 2013; Kusuma et al, 2012). The current research proposed the application of fly ash and organic material as dry cover system to mitigate acid mine drainage generation especially to improve water drainage in mine site. The impact of fly ash and organic material as cover material for material layering underneath, especially the thickness changes is evaluated
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