Sulphide Minerals in Limestone: Trap Rock of Buton Asphalt on Block Kabungka Mine C PT Wijaya Karya Bitumen, Buton Regency, South East Sulawesi

Abstract

This article presents data analysis of presence of the sulphide mineral from three samples including two samples of limestone trap rocks with low grade asphalt and one sample of Buton asphalt rock. These samples were observed with petrographic analysis at the Laboratory of Sample Preparation, Faculty of Engineering, Hasanuddin University. The samples were prepared using the thin section method. Observation of the sample using a Polarized Microscope Nikon Eclipse LV 100ND POL/DS. The results show that sulphide minerals found on all three samples as pyrite (FeS2), chalcopyrite (CuFeS2), bornite (Cu3FeS4), and covellite (CuS). There were no traces of hydrothermal solution such as altered rock or quartz veins, but the composition of the analyzed sulphide minerals had similarities to the sulphide mineral composition in andesite rocks of Central Lombok. The presence of sulphide minerals in Buton asphalt trap rocks has the potential to produce pollution in the form of acid mine drainage (AMD). Therefore, it needs a proper treatment technique to countermeasure of water pollution occurrence.

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