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|Title: ||Acid mine drainage prediction using acid-base accounting method at mine sites in Pahang|
|Authors: ||Tuan Rusli Mohamed|
Wan Zuhairi Wan Yaacob
|Issue Date: ||2009|
|Publisher: ||Mineral Research Centre, Minerals and Geoscience Department Malaysia|
|Citation: ||Proceedings of Simpomin 2009: Sustainability and Competitiveness of Malaysian Mineral Through R & D: Bukit Merah Laketown Resort, Taiping, Perak, 9-11 Nov 2009, p. 72-82|
|Abstract: ||Acid mine drainage (AMD) is a weathering product via oxidation and hydrolysis processes of sulphide minerals for example pyrite (FeS2), arsenopyrite(FeAsS) and chalcopyrite (CuSFeS4),producing high acidity water with elevated concentration of toxic heavy metals. Acid mine drainage is a common problem associated with mining activities in Malaysia but yet still receiving too little attention from researchers and mining operators. This paper will highlight some interesting findings of a research conducted very recently on AMD phenomena in several active and abandoned mines in Pahang. Acid-Base accounting method was used to determine the contribution of parent rock materials and mineral ore bodies in the production of AMD. In-situ water quality parameters were firstly measured on site such as temperature, pH, electrical conductivity. total dissolved solid (TDS) and dissolved oxygen (DO). A total of 19 water samples an d 28 rock samples were collected and analysed in this study The results revealed that pH, as the main AMD indicator, are very low in most of the study locations with the pH values ranging from 2.6 -4.4. Most of the mine water analysed showed high concentration of heavy metals such as copper (Cu), iron (Fe), manganese (Mn), zinc (Zn), arsenic (As) and cadmium (Cd). Acid formation prediction based on Acid-Base Calculation revealed that mines of Sg. Lembing, Bukit Botol, Pekan Mining and Kg. Aur have higher acid generation potential. All of these locations showed very low neutralisation potential (NP) values as compared to acid production potential (APP) values, with the ratio made between them in a range of 0.06 to 0.72. The study also successfully identify the source rock ofa cid generation in these mines, such as from mine tailings in Sg Lembing, massive sulphide deposits in Bukit Botol. tuffaceous rock in association with secondary mineralization in Pekan Mining and tuffaceous silt stone with high quantity of pyrite in Kg. Aur (Bukit /bam).|
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