Salvage

Salvage is essentially a form of currency in the Survivor Timeline of Tomb Raider. It is used for buying (Crafting) weapon satisfactions

Tomb Raider
It is commonly found in the form of small yellow wooden boxes, but salvage can also be found when looting dead enemies. looting Hidden Tombs, and in large grey metal containers that must be payed open.With the right skills learned, extra salvage will be rewarded, and will even be able to be taken from dead animals.

Salvage is used to upgrade Lara's weapons, in the form of weapon modifications, which will increase damage, firing speed, accuracy, ammo capacity, draw time and hold time (Bow only)

Multiplayer
Salvage also plays a part in the Multiplayer Mode, it is used to purchase playable characters and weapon upgrades.

Rise of the Tomb Raider
Salvage returns in Rise of the Tomb Raider, however unlike the previous they come in several different categories and are now known as "resources."

They do not come in as plentiful quality as in the previous game and must be obtained from different sources through out the environment or by hunting.
 * Cloth
 * Herbs
 * Hide
 * Salvage
 * Mushrooms
 * Hardwood
 * Feathers
 * Oil
 * Boar Fat
 * Deer Antlers
 * Exotic Hide
 * Magnesite Ore
 * Bear Hide
 * Technical Parts
 * Byzantine Coins
 * Chromite Ore