The London Metal Exchange is the world's premier base metals market. It offers metals price risk management tools including futures and options contracts for aluminium, copper, tin, nickel, zinc, lead, aluminium alloy and NASAAC, steel billet, plastics and soon cobalt and molybdenum. Last year, the total value of trading was $7.41trillion and the Exchange currently has 5.96m tonnes of material on warrant in 633 storage facilities across 39 locations globally.
http://www.lme.com/