Saronite Ore

Saronite Ore is a metal ore found only in Northrend. The Scourge uses saronite to provide death knights with armor.

Saronite is a new metal ore for mining in Northrend.

Source

 * Mined from Saronite Deposits or Rich Saronite Deposits.

Smelting (Mining)

 * Smelt Saronite - requires mining skill 400
 * 2 ore are converted into 1 at a forge

Prospecting (Jewelcrafting)
Saronite Ore can be prospected by Jewelcrafters with a skill of 400, resulting in a random uncommon and possible rare gem:

Locations
Saronite is generally found in the "higher level" areas of Northrend (Sholazar Basin, Icecrown, Storm Peaks, Wintergrasp and Zul'Drak). Rich Saronite Deposits are uncommon spawns found in Sholazar, Icecrown, Wintergrasp and Storm Peaks. They have a higher chance to spawn in Wintergrasp.