I have not heard about this, and the concept sounds very scary. Old abandoned Swedish mines have a tendency to poison ground water with metals and other polluti

I have not heard about this, and the concept sounds very scary. Old abandoned Swedish mines have a tendency to poison ground water with metals and other pollution unearthed by the mining process. https://www.sgu.se/mineralnaring/gruvor-och-miljopaverkan/ https://www.sgu.se/mineralnaring/gruvor-och-miljopaverkan/