Deeprock Salt

Deeprock Salt is a kind of Salt only dropped by mobs. It can be processed into Refined Deeprock Salt using a Salt Shaker.

Source
Patch 4.0.3a removed most of the monsters which had high Deeprock Salt drop rates. It still has a decent drop rate from earth elemetals and stone giants in the Earthsong Falls section of Maraudon and golems in the Blackrock Depths dungeon.

Deeprock Salt as an Ingredient
Deeprock Salt is used in the following recipes:

Leatherworking

 * Cured Thick Hide
 * Refined Deeprock Salt

Engineering

 * Snake Burst Firework

Cooking

 * Dirge's Kickin' Chimaerok Chops

Deeprock Salt as a Quest Objective

 * (Feast of Winter Veil)