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  • #31
    Another one of these is old mines. We have an old arsenic mine a few miles away that still grows nothing on the tailings after 150 years. Locals used to use it for paths. In the village we have an old copper mine whose tailings only have sparse growth. Elsewhere the tin mines after becoming non economic were still pumped dry just in case the price went up. Water went into the river fine. Then they stopped pumping so should be ok, after all the tin ore had been there for a billion years. It took a decade for the water to fill the shaft but eventually it started to overflow into the river. Now it is considered toxic 'cos it is surface water not half a mile down. Not sure what they are doing about it.