There is a layer of obfuscation at play here. Because there are traditional chiefs and elected chiefs for many given territories. It's not consistently clear who speaks to the actual interests of the indigenous peoples and who is catering to corporations for personal gain.
A lot of people's in BC never ceded territory or signed treaties. So when conversations about mines and pipelines occur, it is very difficult for non-indigenous laymen such as myself to know who is the legitimate representatives.