as a dwarf you also get the find treasure ability. so having that up in the caves and finding minerals might be annoying to change between them often.
for the sake of money, though, mining will bring in some good money even on copper and tin/silver stuff, at least for you to get your mount.
for the long run, i think crafting is better in making money. it doesn't mean you have to craft all the 300 skill items..it simply means if something you can make at 100 skill is very profitable, keep making that while you go out and adventure or log out for the day. nothing feels better than to come back with 2 stacks of some kind of leather..and instead of selling the leather for 30-80s per stack, you turn it into 3 items that sells for 90s-1.50g