RE: carbon purity The only difference I know between a kimberlite pipe producing diamonds or vein graphite is the pressure. Our system here seems to have not had the required pressure to form diamonds but we have 2 other pipes and the pressure could of been different at depth. So at this point, I would say it is possible for the company to find diamonds but the nice thing is we do not have to find them to have a very profitable mine.
Cheers,
Glorieux