Toxic mines put Southeast Asia’s rivers, people at risk

For most of her life, 59-year-old farmer Tip Kamlue has irrigated her fields in northern Thailand with the waters of the Kok River, which flows down from neighboring Myanmar before joining with the Mekong River that cuts through Southeast Asia.

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But since April, after authorities warned residents to stop using the Kok's water because of concerns over contamination, Ms. Tip has been using groundwater to grow pumpkins, garlic, sweet corn and okra.

"It's like half of me has died," Ms. Tip said, standing by her fields in Tha Ton sub-district, and looking out at the river that she is now forced to shun.

Across mainland Southeast Asia, more than 2,400 mines - many of them illegal and unregulated - could be releasing deadly chemicals such as cyanide and mercury into river water, according to research from the USbased Stimson Center think tank released on Monday.

"The scale is something that's striking to me," said Brian Eyler, senior fellow at Stimson, pointing to scores of tributaries of major rivers, like the Mekong, the Salween and the Irrawaddy that are probably highly contaminated.

The Stimson report marks the first comprehensive study of potentially polluting mines in mainland Southeast Asia. Researchers analyzed satellite imagery to identify mining activity including 366 alluvial mining sites, 359 heap leach sites, and 77 rare earth mines draining into the Mekong Basin.

Most alluvial mining sites are gold mines, though some also extract tin and silver. Heap leach mining sites include those for gold, nickel, copper, and manganese extraction.