Peru will look to stop unregulated gold mining in the country’s south-east rainforest, according to its environmental minister.

Environment Minister Antonio Brack said that the national and regional governments will seek to reach an agreement to stop gold panning and dredging in the Madre de Dios area of the Amazon River basin, Bloomberg reports.

“Informal mining, which doesn’t meet minimal environmental standards, is the country’s biggest social and ecological problem,” Brack said.

Brack said that workers on about 1,545 gold mining claims yearly dump nearly 32t of mercury in rivers ever year, Bloomberg said.