If the long term intent of this project is as a storage facility for spent nuclear waste, you might want to consider this article : https://www.popsci.com/storing-nuclear-waste-in-salt-deposits-isnt-as-secure-as-youd-think/   If you are definitely not going to use if for nuclear waste, then assurances and caveats should be included in the contract unless this is another example of our provincial government trying to fool it citizens into accepting a done deal as was done with cancelling the coal mining prohibition.