Nostalrius Begins - Quality wow vanilla realm (1.12)

Azeroth.

PS: On a serious note, look for the mine nodes on any respectable 1.12 database, it will show you locations per zone.

Tons of iron and a little bit of mithril in badlands

Silver: Ashenvale, northwest of Splintertree post, along the river. Also near the bear cave near the road junction.

Iron: Literally everywhere, but if you want to focus, 1k needles - harpy cave and wyvern perch.

Mithril: Again, many places have abundant veins, personally I found a lot around the bug cave in Shimmering Flats.

Disclaimer: None of these spots are Blizzlike[citation needed], the amount of spawned veins at once is (used to last I checked) be much higher than intended. If that bothers you, do not mine them . Also, for the record, I haven't mined them ever for those reasons .

P.S. If fishing for exploits to fix, it's not subtle enough .

Badlands is pretty good for both iron and mithril iirc, it's a good transition zone.

Silver can be found wherever you find tin in abundance. So, likely redridge caves, westfall caves, if you dont want to trek everywhere in ashenvale. If memory serves of vanilla WoW (dunno if that remains the same here).

Badlands is indeed best for iron + mithril. 1k Needles shimmering flats + Tanaris both good for mithril. Arathi Highlands good for iron/tin with a dashing of mithril (again, if same as vanilla WoW).