You seem to misunderstand how mining pollution actually works. When things like uranium are trapped in rocks they are typically immobile and not bioavailable.

You seem to misunderstand how mining pollution actually works. When things like uranium are trapped in rocks they are typically immobile and not bioavailable. In most ground strata things things can be stabally held for millions of years. When humans mine the area we can cause what would take erosion millions of years in hours. For example blasting and mechanical splitting of rocks then loading them with equipment causes huge amounts of dust. Also in the process of exposing 'fresh' rock we cause sulfate materials to be exposed to water creating acids that mobilize metals.