Dig to the bottom of the map and then start clearing out tunnels. You will hit exotic stuff.
I am digging pretty deep, but my map kind of sucks and I blow through picks constantly. I may have picked the wrong area to set up camp since I have so little time to explore.
Currently Playing: PC: BFBC2, MOH, COD: Black Ops 360: nothing
BFBC2=Brennok
Steam=Brennok
Xbox 360=Nobrumski
Gamespy=Nobrumski