The summary of the class is "Fighter/Miner is to dwarves as Fighter/Magic-User is to elves, so-called racial detection abilities are actually class abilities, otherwise treat miners as thieves with various stonework skills replacing thief skills." It's not a great class, but it gives players of dwarf PCs something to do with earned experience after maxing out as fighters.
But, as I noted in that old post, I didn't really have an equivalent to founding a barony or thieves' guild for dwarven miner lords.
Well, duh, they would build an underground fortress, attracting 1st level dwarf miners. And, as Zornhau suggested in a comment, and as also occurs in DF, creating their fortress eventually releases something nasty from below.