In-situ leaching AKA nuclear fracking.
I have recently heard of this method of leaching nuclear ores when I was studying nuclear energy technology.
Essentially, leaching is the process of using a acid or alkaline to absorb uranium from its ore so it can be further processed.
In-situ leaching is basically a way to do this without having to dig out the ore, it can only be done in situations where the ore is close to underground water sources.
The miners pump leaching liquid, usually sulphuric acid, as close to the ore as possible, and then pump it back up when it’s finished soaking up uranium.
Here is a link which explains it better.