Zelmite Mine is the seventh and final dungeon in Dark Chronicle, and takes place during Chapter 8: The Forgotten Adventure. It is a large mine in Palm Brinks that has been mostly stripped of its zelmite ore. Mayor Need sends Max to look for more zelmite, as he feels there is a huge deposit that's just waiting to be discovered. Zelmite is a mint-colored Crystal that can be used to power many things, such as the Blackstone One. This includes living creatures such as Metal Flotsam, who survives only through the power of Zelmite.

Although only Max is available to use at first, Monica later makes her reappearance upon entering the Miner's Breakroom. There are four dead ends containing mini-bosses, two break rooms, and the depths containing the final boss, for a total of 38 floors. Only two seals are present in the entirety of the dungeon - both of them being white seals. The gate key is the Trolley Oil, which is used to power a mining cart to advance to the next floor. Getting through blocked pathways requires the Rusted Key, which simply opens the locked door.

There is very little in the way of story this chapter due to this dungeon being entirely optional, as you have technically already beaten the game to get here. However, even with ultimate weapons and some skill, this dungeon will still be a challenge for most players. It gets even harder as you go on by throwing stronger versions of the previous enemies, improving vastly in health and damage. The Ridepod has surprisingly little defense against the stronger enemies, and so it is imperative that you build up your ultimate weapons to its maximum possible stats.