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This study aims to analyze the impact of nickel postmining activities on the heavy metal level in sediments of the river of Lambuluo, Motui Subdistrict, North Konawe District, Southeast Sulawesi province about the importance of the river biota. Then, all of the results of the sample were analyzed by dendrograms method. It was found that all of the heavy metal in the river sediment remained under control or Non-Polluted. According to this output, it can be shown that the dominant heavy metal content was Iron with minimum & maximum value, mean, and standard deviation respectively were 1.0733, 1.1067, 1.087783 and 0.0150264. All of the heavy metals in the sediment in settling pond caused Heavy pollution and High Effect ranges, except Chromium VI. Based on this output, it can be shown the dominant heavy metal content was Iron with a minimum & maximum value, mean, and standard deviation respectively were 13500, 217000, 193000, and 22172.88. Keywords—nickel laterite; heavy metal; river sediments

Impacts of Nickel Laterite Post-Mining Activities on The Level of Heavy Metal Contamination in River Sediments