The following graphs provide links to Kitco.com website for international metal prices for a ‎range of commodities over various time periods. Click on the icons for daily  updated 24 hour ‎spot prices and click on the text below the icons for longer term trends. ‎

Metal prices in the international markets

Gold chart upto ten years Palladium chart upto ten years Platinum chart upto ten years Five Years Nickel Five Years Copper Five Years Zinc Five Years Aluminium Five Years Lead 30days Rhodium

Also the LME (London Metal Exchange) lists prices for most metals.‎
http://www.lme.co.uk/copper.asp