Except it became so expensive to run them.

Similar thing happened to the copper mines of Hungary, at one point it became so expensive to mine it was cheaper and easier to shut them off, at least temporarily. We potentially even have some gold in the same mine, it’s just allegedly so deep no current technology is able to mine them.

Same with the local closed coalmines, but with environmental concerns, and my house is sinking because of them. However, there’s way more conspiracy theory is out there about them.