On the way to Buffrack we come across a mountain spring.

And, oh hey! I thought that was Tetrahedrite I was walking past, but on closer examination it turns out to be Magnetite. How embarrassing. Still this does make this area a good place to look for potential fortress sites.
Now that I'm keeping an eye out for it Magnetite is everywhere. When I come down from the warm mountains the hot jungle below is packed with trees. Date palms, limes, pomegranate. A fortress near here would have marble, magnetite and never run out of logs. There are elves, about two days' walk to the NE, who might have something to say about the last part of that, though.
The shops and halls of Buffrack start at a very shallow depth, the loamy soil is soft beneath my feet and there's a dank smell to the air. I wonder how they stop mushrooms growing everywhere.

They have thread for sale. If there's a loom here (or I can make one) I should see about making myself some clothing from scratch. A few levels down there is limonite to be seen in the rough stairwell walls. Cassiterite a little further down, Tetrahedrite below that. These people obviously chose their location well. Unfortunately the only facility the fortress sports are Magma smelters.
Next stop Mobabbeys to the East, skirting around the Dark Pits to the South.

I sleep under the open stars, and the next morning we are assaulted by a Jaguar before I can shake the sleepiness from my head. Luckily my companions prove their worth and slaughter it in moments. I lost my dwarf companion crossing a river. Oh, he's not dead. He just didn't want to swim. Hopefully he will catch up with me later.
Mobabbeys has magnetite, and a _lot_ or iron armor for sale. Marble, too. But I didn't see anything made of steel for sale. They may keep the best stuff hidden. The lowest level of the fortress has veins of kimberlite. I may try my luck mining for diamonds.