bhutocracy

Simple as a CC deposit at http://www.igmarkets.com/ or any one of half a dozen CFD providers. The harder part is finding the highly leveraged drills and getting the timing right so that general market fluctuations don't trigger your stop loss. Also much easier if you've actually spec invested in the lead up to the drill. Very easy to make 200-300% in the run up to a big drill, free carry and then move profits over into a CFD position, that way if your stop does get triggered you're not losing the initial position, only profits. It's a numbers game given most drills fail, can be highly lucrative though.
Eg Africa Oil mentioned above has made a 500% return in a little over 6 months (quadrupled in the last month or so). If you invested say 10k last october, pulled 20k out a month or so ago, kept your 10k in the bank for next time and put your 10k profit in CFDs at 7:1 (leverage depends on provider) you'd have $220k profit now. Don't get me wrong it's easy to do your dough, especially in a shitty market like this, I hit a stop on Monday that i'd put on Friday but that's mainly because I'm trying to be too fancy, I should just be chilling out until the drillbit is 100m from the target depth. You can always expand your stops and lower your leverage to lower the risk of getting bumped out of your position.. but you did ask for high risk.. so.. I know of few other ways to turn a couple of k into a hundred k that isn't just luck (although timing is everything there is a fair amount of skill involved in picking the drill and the timing.)