Today I was leveling mining on my alt before I headed out to northrend, so I got to 270 mining or so and headed to EPL to mine thorium. I got about 3 stacks of thorium leveling there.. So I sent it to my bank alt..
When I logged onto my bank alt, I put it up, for 60g per stack. I thought it wouldn't sell, but it did, and I made a good 200 gold.
You should farm EPL for these reasons:
1) No body else farms there, they are farming in northrend, which well increase the price of pre bc ore, and leave you farming alone so no need to fight over ore.
2) Good money if you need it really fast.
3) The zone is flooded with rich thorium veins which well give you a good 5 ore per node.
The mining route:
(I got this from WoW Mining Guide 1-375 | Free WoW Guides I TAKE NO CREDIT)
Addons:
Gatherer- this is a addon that well put all the nodes on your map when you mine them. A must for farming.
Tips:
On some servers, if you smelt the ore it well go for a higher price. On my server, when you smelt thorium it goes for 14g more than ore.. So you might want to smelt your ore :P