Chiang Mai: Communities along the Kok River in Chiang Mai and Chiang Rai on Monday called on the Chinese government to address heavy metal contamination they say is caused by Chinese-owned mining operations in Myanmar.
Representatives gathered at the Chinese Consulate-General in Chiang Mai to submit a four-point petition urging Beijing to investigate the mining operations.
They alleged the mines released heavy metals into waterways that feed major rivers in northern Thailand.