I'm probably one of a few others to suggest or want this, but we need more mines. I've been told by several people I know or have met in H&H that we're all out of mines. Now I know metal is supposed to be rare, but holy hell, only a single set number of mines in the entire game? I'm sorry but that's a bit insane. We could use a few more mines.
Another suggestion, dowsing rods could be partially used in finding mines, but not starting them. Using a dowsing rod would make it a 1/4-1/8th times easier in finding a mine spot, but rustroot would be needed to test the dirt to make sure just like it is now.