An environmentalist from Thunder Bay says people should be concerned about the release of water from a tailings pond at the Lac Des Iles mine.
The mine announced last week it would dump water from a tailings pond, after failing to achieve what it calls "water balance."
The Ministry of the Environment says the release so far involves 120,000 cubic metres of water, with elevated levels of suspended solids, aluminum and iron.
Meanwhile, Peter Lang, with Citizens United for a Sustainable Planet, says the mine's explanation of high rainfall filling the ponds is a poor excuse.
"That's not an excuse and that's not acceptable," he said.
"We have to have provisions somehow to refine the products, have backup tailings ponds, or not do the mining itself until we can prove that we can do it safely."
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