Honestly, this. 50% might be a bit much because unfortunately, if you give them too much ownership then you'll just end up sending the mines overseas again. At least here you're (hopefully) creating jobs for Americans, both indigenous and not.
Tbh, in my opinion if someone's building on land that is culturally and/or religiously significant to indigenous tribes in the US, then there should be something along the lines of 5% of profits gets split between all US tribes (based on tribal membership), and then a split of >30% of ownership and profits that gets split between the tribes that have a direct claim to the cultural/religiousness of the land used (with the claim again being split between tribes based on tribal membership).
Note, those are "ass numbers" (I pulled them out of my ass) and not meant to actually be specific values so much as they're intended to get the idea across.
My biggest worry with such a system, however, is that it could lead to increased corporate entitlement ("we're paying the "savage tax" aren't we? Fuck off and let us rape the land lmoa"). At the same time though, Native Americans have a hard enough time of getting corpos to respect them; so receiving profits and sharing ownership of companies or installations on historically significant tribal land might be worth it despite the risk of further encouraging corporate entitlement.
