Ozzmar

I've never been an uber-farmer by any means, so I'm not entirely sure this is a very efficient way to farm.

However, on my other rogue, Mana Tombs was a great place for me to mine Adamantite (and the occasional Khorium if I got lucky). Most of the nodes (2 per instance) are far enough away from mobs to allow you to hit them without pulling aggro. Being Subt spec certainly helped with this, but it's definitely not necessary.

If you decide to bring a Stealthy-friend, there are also always 2 chests in the zone that can easily be ninja'ed. Another rogue and I would double Sap, assist gank, and clear the 3-4 mobs near chests, and would end up getting a handful (5-6g) of gold, potions, and several BoE blues.

So, if you're like me (loathe repetitive dailies), you might get a kick out of Mana Tombs.