If you have ever studied uranium mining and milling, you know that it creates huge costs to taxpayers. Companies mine and then move on, leaving a huge radioactive mess behind.
Companies that looked for uranium in the Black Hills in the 1960s and 1970s left thousands of exploration holes behind. Many of these holes were not plugged. Water moves up and down the holes, which can contaminate clean water.
Miners also left open shafts, open pit mines full of acidic and radioactive water, and holes big enough for a person to fall into.
We have no reason to think that uranium companies have changed. And now the companies that are trying to mine uranium in the Black Hills are from other countries, like Canada and Australia. All they have to do is pack up and go home, and we would be left with the mess again.
The best way to avoid this is not to start mining uranium again in the Hills.