If levels continue to rise faster than pumps can abstract, untreated water could enter the Carnon river.

BBC: Concern contaminated Wheal Jane water may pollute river

At Wheal Jane, the extra pump is part of efforts to help stop water from the mine overflowing and polluting the Carnon valley.

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The Environment Agency said it was concerned if levels had continued to rise faster than pumps could abstract, untreated water could enter the Carnon river.

BBC: An archive picture of Wheal Jane