Porphyry Deposits: The World''s Largest Source of Copper ...
May 28, 2014· Porphyry Copper deposits play an important role in the global economy. These deposits provide over 60% of the world''s copper and include other important metals such as molybdenum, gold and silver. Porphyry copper deposits are known for their low grades and very high tonnage. A porphyry is not a rock type, but rock with a particular texture.