|This article contains massive spoilers. If you do not wish to have your game experience spoiled, do not scroll down!|
- You have struck adamantine! Praise the miners!
Raw adamantine deposits are located at the far right edge of the mountain, lining an impassable chasm a short distance beyond the eerie glowing pits located past the magma river.
- A miner has broken through to an expansive cave system.
 Too Deep...
Once you begin mining raw adamantine, there will be a chance at each season change that the game will abruptly end with the message above (unless you are under siege); thus, if you want to keep your happy fortress running indefinitely, you must never mine any raw adamantine.
The process works like this: at the end of each season, the amount of mined raw adamantine is compared to a random number between 0 and 99. If the ore amount is larger, your fortress will be "too-deeped" at the end of the next season. The random number is "re-rolled" for each check, so even if you mined only one tile of adamantine, your fortress will come to an end sooner or later.
Abandoning and reclaiming the fortress resets the timer but not the amount of mined ore - since you arrive at the very start of the season, you have a whole season before the first check, and another one before any chance of 'too deep'. So, if you mine 100 (or more) ore, abandon the fort, then reclaim it, you'll have two seasons to do what you want. At this point, you can either abandon and reclaim again, ad infinitum, or let time run out.
Fortresses that come to their demise in this manner cannot be reclaimed, though they can be explored later in adventurer mode.
If you revisit such a fortress in adventurer mode, you will encounter the demon that was released from the abyss. If you manage to defeat it, all raw adamantine in the fortress, mined or not, will turn into galena. Mysterious!
|Gray||Andesite • Basalt • Chalk • Diorite • Dolomite • Felsite • Flint • Gneiss • Granite • Pumice • Rhyolite • Sandstone • Schist • Shale • Siltstone • Slate • Talc|
|Light||Limestone • Marble • Moonstone|
|Dark||Jet • Obsidian • Onyx|
|Ore||Adamantine, raw • Cassiterite • Coal • Galena • Gold, native • Hematite • Malachite • Platinum, native • Sphalerite|