Indonesia Conference Directory

Abstract. Heavy metals such as Cu, Pb, and Zn, have been reported to be the main contaminants found in post-mining areas. Settling pond treatment systems have been applied to the base metal mining area at Sangkaropi, before being discharged into the Koyan River through the agriculture area. This study aims to conduct an assessment of heavy metal contamination in areas impacting base metal mining. The material tested was sediment deposition in the Koyan River which is a sensitive indicator for monitoring contaminants in the aquatic environment. River sediment sampling is categorized into three areas, namely the first area upstream before the mining location, the second from the mining area to settling pond and the third area after settling pond to the agriculture area. The heavy metal test method uses the Atomic Absorption Spectrophotometry type Buck Scientific 205 version 3.94C. The assessment is performed based on the value of contamination factor (Cf) to explain the process of contamination toxic substances to the environment, Geo-accumulation Index (Igeo) to describe the enrichment of heavy metal concentrations above the baseline level and ecological risk factors (Er). The results of this study represent that in the first area, the assessment of Pb metals is low, Cu and Zn metals are unpolluted to low. In the second area, the Pb metal has values classified as strongly - extremely polluted, Cu (low - moderately polluted), and Zn metals (unpolluted - low). In the third area, Er values on all metals are classified as low polluted and Cf and Igeo values are unpolluted. The results of the assessment of the distribution of heavy metals Cu, Pb, Zn will be able to assist policies to direct land use in areas impacting mining and interdisciplinary studies to assess environmental health impacts.