books.google.ca - Metals in the earth's crust are very unevenly distributed and, traditionally, a small number of ore deposits, districts or countries have dominated the world supply and have influenced commodity prices. The importance of exceptionally large, or rich, deposits has greatly increased in the age of globalization...http://books.google.ca/books/about/Giant_Metallic_Deposits.html?id=1tWllDxMkEYC&utm_source=gb-gplus-shareGiant Metallic Deposits
