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If copper is worth its mettle in predicting the financial future, it appears the global economy isn't headed off a cliff after all. Despite a growing number of indicators that global growth is slowing, the steady price of the red metal, dubbed "Dr. Copper" for its ability to diagnose economic activity, is signalling the economy may not be as sick as it seems.

Porphyry deposits are the world's most important source of Cu and Mo, and are major sources of Au, Ag, and Sn; significant byproduct metals include Re, W, In, Pt, Pd, and Se. They account for about 50 to 60% of world Cu production and more than 95% of world Mo production. In Canada, they account for more than 40% of Cu production, virtually all Mo production, and about 10% of Au production.