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The gold mining is carried out by the people of Labuan Kuris village traditionally, with processing sites that are close to the Watershed that allow river flow to be contaminated with heavy metals from gold processing waste. One effort to understand such environmental conditions is to study the properties of magnetic minerals contained in river sediments using the method of rock magnetism. Sampling of river sediments from upstream to downstream is 30 points. This study aims to determine the comparison of magnetic properties in river sediments before and after exposure to gold processing wastes through the value of magnetic susceptibility (lf and hf) measured using Suceptibilitymeter Bartington MS2B. The results showed that the average low frequency magnetic susceptibility (lf) of river sediment samples before exposure to waste was 810.66 x (10-8m3kg-1), whereas for low frequency magnetic susceptibility values (lf) after sediment samples were exposure to waste is 19,746.37 x (10-8m3kg-1). The mean value of lf indicates that there is an increase in the value of river sediment magnetic susceptibility from upstream to downstream before and after exposure to peoples mine waste.