Porphyry Deposits: The World''s Largest Source of Copper ...
· Grasberg is the world''s largest gold mine and secondlargest copper mine. It was originally discovered by geologists looking for the source of the rich alluvial gold deposits in the lowlands of Irian Jaya. Between 1990 and 2019, the Grasberg district produced 33 billion pounds of copper and 53 million ounces of gold.