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Gold mine wastewater have several sources, among them from gaold washing activity. Wastewater from gold washing activity has high turbidity, TSS and heavy metal content. These conditions are not safe for the environment if it-s disposed directly. Wastewater treatment is carried out using Electrocoagulation (EC) with a batch method. This study aims to determine the optimal efficiency and conditions for TSS, Cu and Hg removal from wastewater. This research is a laboratory study with variations in DC current voltage (6 volts, 9 volts and 12 volts) in the variation of detention time (15 minutes, 30 minutes and 45 minutes). Data analysis was performed by calculating removal efficiency of TSS, Cu and Hg parameters. The experimental results obtained EC removal efficiency on TSS, Cu and Hg parameters are high, ranging from 68.6 to 99.97%. The quality of treated wastewater complies with established quality standards for reuse or disposal into the environment. The optimum conditions for processing EC at a voltage of 9 volts during detention time 30 minutes.