Death Warriors

Blacksmithing
You will generally use the Mining profession to gather resources.

Copper and Tin: Loch Modan is a zone abundantly filled with both metals; tin is mainly found in the east half of the zone, with some concentrations to the northeast by the elite Ogre camp. The rather low number of mobs and their predictable behaviour makes this an excellent zone to farm Copper and Tin or level up your mining skill. This is an Alliance zone, but higher level Horde players can conveniently access it via the Badlands.

Gold Coast Quarry in Westfall.

Hilly terrain in Silverpine Forest is a good place to mine copper and tin for Horde characters.

Iron and Mithril: Yeti Cave in Hillsbrad Foothills (be careful not to get ganked while in the Yeti Cave on PvP servers).

The Charred Vale in the Stonetalon Mountains has many Mithril (and other ore) nodes, and is close to the Sun Rock Retreat Flight Path (for Horde) or Stonetalon Peak/Nijel's Point (for Alliance).

Mithril: Arguably one of the best Mithril spots in the game is Lethlor Ravine in the Badlands. This is a valley in the east of the zone with two entrances north and south. As an added bonus, there are many Scalding Whelps there (level 42-43 dragonlings doing moderate fire damage), which can be farmed or grinded for experience and loot drops. The center of the area is patrolled by level 43-45 elite dragons, but usually they aren't interfering with your mining unless your level is lower than 40, making their aggro radius quite large. The occasional gold vein also pops up here. (please confirm-Badlands has very few mining sites and the Ravine is essentially void of deposits).

You'll need a Blacksmith hammer which can be found at any Blacksmith vendor.(This information is confusing, since almost all the Blacksmith info you list pertains to mining... you need a mining pick to harvest ore. Sold at any common trade skills vendor, or vendor that sell these items. Several loot drops/weapons also function as a mining pick)

Gems are also found from Mining.

http://www.wowwiki.com/Places_to_farm