Same goes for any natural resource. Oil, precious metals, water, etc. Globalization feeds this behavior, but that’s a conversation people don’t usually want to have
No, in most cases the contract stipulates profit/revenue sharing. E.g. Orano's uranium mines in Niger had 50% of all revenues going to the Nigerien government. In other cases it's much lower (e.g. Dundee Precious Metals in Bulgaria pay 10% of profits to the state).
Even Zuckerberg paid in an extra 10% ($20 million)over and above his land costs to fund affordable housing, conservation and a jobs program in Kauai to get the deal done
I thought it was implied in the question "What does the local economy get out of it?"
A fair share is when the local economy gets out of it what the local economy needs/wants.