Board Thread:General Mod Discussion/@comment-25931200-20150420213207/@comment-26141884-20150420235735

I did best at level 8, dig a 2 by 2 tunnel till you hit an obstuction, then dig more 2 by 2 tunnels branching off at three block intervals. (Basically strip mining) Dig each tunnel till you hit lava, water, or another obstruction. I soon had going on two stacks of mithril ingots with this teqnique.