Dan, Answering your Q from a few days back, yes I did buy into a small amount of shares in this startup co, (really a rev merger, grc-ca was cgb.h-ca ). Already up several pennies.
I treat this one as a sort of lottery ticket. I don't buy too much of it, but the payoff could be huge if they hit pay-dirt.
6 months back I though all canadian diamond mines were just investor traps. (Perhaps many actually are.) I was surprized though to find that several kimberlite sites up north are actually are producing raw diamonds.
Anyway this new one says they are ready to start drilling in 7-10 days. I've got my fingers crossed. "Little to loose, much to gain".