Destroyer Lodestones
You only really get 1 per hour just killing mobs anywhere, even with MF.
Farm the 76+ Dredge at Frostgorge Sound for Heavy Mining Bags, they give you a better drop rate.
SE and the Dredge Fractal are where my guildies go for theirs.
Sickest Guild [NA] Blackgate
ill try those out and see how it goes tonight