A toxic pollution spill from a mine operated by China’s top gold producer Zijin Mining Group has spread to a second province, threatening the fishing industry there, state media said Tuesday.

Poisonous waste water from the copper mine in Fujian province has contaminated the Ting river — a major waterway in the country’s southeast — and has now flowed downstream into Guangdong province, the China Daily said.

The pollution “will pose a big challenge to local fish farming”, a notice from Guangdong environmental authorities said, according to the China Daily.