With regards to gold mining in Datuku in the Upper East region of Ghana, gold bearing ore is ground thoroughly and mixed with mercury to form an amalgam. The gold amalgam is roasted to release mercury and to concentrate the gold. Excess mercury in the mine tailings is discarded onto the environment which ends up in water bodies through run off. Methylmercury in water and mercury oxides in air that result from gold amalgam finds itself in humans through inhalation or ingestion of water or mercury-contaminated fish or food
https://www.scribd.com/doc/241776611/Small-Scale-Gold-Mining-and-Heavy-Metal-Pollution-Assessment-of-Drinking-Water-Sources-in-Datuku-in-the-Talensi-Nabdam-District
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