Maybe I'll just try to speak really quickly, because I believe our time is almost up.
It should be as early as possible. I know that's not the specific answer you're looking for, but we want to make sure that the engagement is early enough so that indigenous peoples can truly participate in the decision-making and have an impact on the outcome. There's a concern that if we're engaging indigenous peoples too late, it's a fait accompli. You want to make sure that the engagement is early enough.
You are right that I have heard criticisms, mostly coming out of Mexico, in fact, that if the engagement is too early, there's no information that can be provided. My only response at that point is that as early as possible, when the first idea comes up, start building that relationship so there is a relationship of mutual trust and respect that can be built upon for consultations about a specific project.