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Supertopics:
Metal Depletion (Peak Metals)
Metal Depletion Miscellany
Documents:
a China trade deficit on rising fossil fuels & metals
web
Chris Hogg
BBC
2010-04-10
declining ore grades of precious metals
web
Market Oracle
2009-11-04
precious metals are being used up quickly
web
David Cohen
New Scientist
2007-05-23