heysimon, Invest as much as you're prepared to lose.
So what are the risks for investing here? Presumably the main one is that a few months down the line a new statement comes out saying initial estimates were wrong or that the oil is even harder to extract than initially thought. But even then surely the potential is to extract significantly more oil that the company currently is so I'd imagine share price is fairly under valued even if the actual amount extracted is lower than the current estimates?