IMO it would be much more reasonable to provide the typical 1-2% NSR.
The implication being that the exploration had led to production, and that the jobs provided to the local communities during exploration (transportation, drilling, etc) as well as support (education) as demonstrated by Noront would suffice.
I also wonder, why 24%? Is that just a PIOOYA number? Would Noront have been prevented from using the deep drilling rigs if 1/4 of their budget was hijacked? I doubt Noront could have afforded it, and as a result the proven reserves would not be anywhere near as attractive as they are today as a result of that exploration.
Limiting the exploration in this manner is foolish, IMHO.