Yerf, finally got a BS toon and being the genius I am I did it on a new server, meaning no financing/PLing - every scrap of ore I mined myself.
At this point I think it's fair to say that BS is quite possibly the roughest tradeskill to level after having just spent the past two days personally mining the 500 thorium ore needed to make the final run to 300. UnGoro is hands down the place to farm - nice easy circle of the place, minimal hive diving and tons of ore to be found. Someone had suggested Silithus due to the rich thorium nodes in the hives but take it from me, it's not worth it - UnGoro might not have as many rich nodes but its WAY faster getting from node to node and there's a ton more of them.
Now that I can finally mine and use the stuff I mine in Outlands back to leveling!