Caves are most in obsidian elevation and always in high slopes
Them are a pain to found because now mountains are full of big rocks on slopes making you so hard to see a cave from down and above ( and impossible on blizzards ) , good thing is that problem makes you easier to do the "mountain goat " , before was pretty hard going up in slopes because was near empty of big rocks to stop jumping for recharge stamina
And i found golems and dragons spawn a lot more when you are minning