Some mines use ISL techniques which is similar to fracking. Canada does have Cigar Lake, the highest grade uranium mine in the world (15%), but due to the dangers of high uranium concentrations and the challenging geology, it has not been the easiest to extract.
This is to say, you don't just dig up some ore and stuff it in a reactor(it takes a lot of ore to power a reactor), nor is uranium mining a clean process.
https://de.wikipedia.org/wiki/Tagebau_Garzweiler#/media/Date...
and are planned to become lakes (but at least in Germany nobody knows where the water is supposed to come from).
The places where coal is mined under ground need to run pumps forever or the surrounding cities are destroyed. The pumps in Germany's Ruhrgebiet consume about 70MW continuously. In a couple of decades the pumps will have consumed more energy than we got out of the coal.
And, of course, if we continue to burn coal in a couple of decades largeish parts of the globe might become uninhabitable to humans.