There are now three new Dungeons in Blue geomorph packs available on DriveThruRPG / RPGNow. The Mines #1, The Mines #2 and The Mines #3 all depict rough-hewn, unfinished corridors and chambers supported by irregular pillars and posts. You can use these tiles to represent mine tunnels or areas that are under construction. All three map tile sets are also available in a discount triple pack.
Since I have a bit of a technical issue getting the preview for #3 posted to DTRPG, I thought I'd share it here. It's fairly representative of all three geomorph sets.
As you can see, there are crossover tiles that connect mines-style tunnels to other room and passage types.
That's it for this update, thanks for checking it out!