Giant Metallic Deposits: Future Sources of Industrial Metals - Peter Laznicka - Google Books

https://books.google.de/books?id=1tWllDxMkEYC&pg=PA442#v=onepage

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,…