You have now found out a little bit about the energy density of Uranium. It has little to do with how dangerous mining is and what the consequences are (exposure to Radon, contamination of drinking water, ...).

Fact is, here in Germany we have been mining for coal for decades. It has a lot of negative impacts on nature. It is still going on. But it is slowly phased out against political opposition.

Uranium mining OTOH has been phased out already. Uranium mining has such severe negative effects on the nature that in Germany it is closed with huge monetary investments.

You can read about the closing of the Wismut mine here: http://www.wise-uranium.org/uwis.html

Mining for Uranium is now going on in remote areas or in states with the political structure for it.