Mae Sot locals sue two zinc mining firms for B3.7bn

The Mae Tao saga began in 2004 when a study by the International Water Management Institute found that soil and water supplies in the Huay Mae Tao and Huay Mae Ku areas in Mae Sot district were heavily polluted with cadmium. The contaminated area covered 13,200 rai, including paddy fields, plantations, waterways and residential areas. The Agriculture and Cooperatives Ministry and the Pollution Control Department later confirmed the cadmium contamination, but none of the agencies could confirm the source of the pollution.

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Source: http://www.bangkokpost.com/news/local/10020/mae-so