On 0.41.04win, the Expedition Leader, last officially noted to have dabbling mining, growing, architecture and organizing, plus novice herbalist/fisherdwarf (and the usual dabbling social skill spread) and had become an expert record keeper (and only really given fishing/plant gathering duties, when not doing his particular noble duties) went into a strange mood. From previous versions I'd have expected stonecafting, given his lack of 'moodable career direction', but he took over a mason's workshop and produced a rather average legendary stone door.
Which, somehow, gave him Legendary Miner status. The above skills exactly as they were. AFAIAA, he'd never touched a pick in his life (I only have two, and the two actual miners, by now both legendary themselves through normal effort, won't have relinquished them).
I suppose if I had a spare pick I could use him (carefully, if leader-loss is still a problem) but I'm still trying to get past the site-wide aquifer on the otherwise interesting site (treeless, but featuring joining rivers and deep, deep canyons) that's so far lacking opportunity to get into the subteraneia for underground-grown fuel or hot rock. ((BTW: This was a non-"Prepare Carefully" expedition, so the founders had an eclectic mix of skills, inclusive of the fairly useless woodworking skills, given the lack of materials, aside from the original wagon's three items of wood and some Dwarf-caravan imports. Not seen hide nor hair of elves, yet. Or, indeed, the Humans traders.))
Hmm, and now (just as I'm writing this up, off-line, ready for when I'm on-line again and checked there's nothing else out there about this phenomena) the game crashed, just as I was trying to send the military (having just managed to strangle a bothersome vulture to death, whose pals had already stole some of my plump helmets) against a second target (an equally bothersome buzzard... Looks like I need some AA defences, i.e. the bows I can't afford to waste my limited resources on). Still, I'm now getting used to the new military features. With way more to learn.