Some 3,000 people are estimated to have been involved in the activities, operating about 300 excavators every day. Most of them reportedly operate illegally.
The use of mercury in the mining process was also endangering water quality, Ali said, as downstream there was a dam in Dharmasraya regency which irrigated over 20,000 hectares of agricultural fields.
The local tap water company also uses the river as a water source while local fishermen breed fish in keramba (fish cages) placed in the river.
http://www.thejakartapost.com/news/2015/03/02/inpres-sought-mend-serious-damage-batanghari-river.html
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