All links are sorted by abundance.
Above the map you will find links to every zone that contains ore spawns, accompanied by the number of nodes found in that zone. Under the map you will find the possible drops from the vein you are looking at.
The number after the name of each ore is the skill required to mine it.

Copper - 1
http://www.wowhead.com/?object=1731

Tin - 65
http://www.wowhead.com/?object=1732

Silver - 75
http://www.wowhead.com/?object=1733

Iron - 125
http://www.wowhead.com/?object=1735

Gold - 155
http://www.wowhead.com/?object=1734

Mithril - 175
http://www.wowhead.com/?object=2040

Truesilver - 230
http://www.wowhead.com/?object=2047

Dark Iron - 230
http://www.wowhead.com/?object=165658

Small Thorium - 245
http://www.wowhead.com/?object=324

Rich Thorium - 275
http://www.wowhead.com/?object=175404

Small Obsidian Chunk - 305
http://www.wowhead.com/?object=181068

Large Obsidian Chunk - 305
http://www.wowhead.com/?object=181069#z0z

Fel Iron - 300
http://www.wowhead.com/?object=181555

Adamantite - 325
http://www.wowhead.com/?object=181556

Rich Adamantite - 350
http://www.wowhead.com/?object=181569

Eternium
You’ll find it in Fel Iron, Adamantite and Khorium veins.

Khorium Ore - 375
http://www.wowhead.com/?object=181557