Mining

With Expert-level mining, you can harvest ore from the following mineral veins: http://www.wowhead.com/?objects=-4&filter=cr=7;crs=4;crv=225

Note that Incendicite (http://www.wowhead.com/?object=1610), Lesser Bloodstone (http://www.wowhead.com/?object=2653 ), and Indurium (http://www.wowhead.com/?object=19903) are quest-related veins.

For those who wants to know the level requirements for mining skills:

Apprentice - none
Journeyman - character none, mining 50
Expert - character 10, mining 125
Artisan - character 25, mining 200
Master - character 40, mining 275
Grand Master - character 55, mining 350

With gathering professions now comes new passive and cast abilities. Mining now gives you the passive ability "Toughness". With each rank up in Mining, you obtain a new rank in this skill.

Here are the different ranks for this ability in order of ranks and Mining skill:
(mouse over the link to view the information for the rank)

75 - 149 (Apprentice):
Toughness (Rank 1)

150 - 224 (Journeyman):
Toughness (Rank 2)

225 - 299 (Expert):
Toughness (Rank 3)

300 - 374 (Artisan):
Toughness (Rank 4)

375 - 449 (Master):
Toughness (Rank 5)

450+ (Grand Master)
Toughness (Rank 6)

Happy Mining! :)
(Edit: Corrected skill level vs rank, thanks!)