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Porphyry copper deposit
Porphyry copper deposits are copper orebodies which are associated with porphyritic intrusive rocks. The ore occurs as disseminations along hairline fractures as well as within larger veins, which often form a stockwork. The orebodies typically contain between 0.4 and 1 % copper with smaller amounts of other metals such as molybdenum, silver and gold. They are formed when large quantities of hydrothermal solutions carrying small quantities of metals pass through fractured rock within and around the intrusive and deposit the metals.
Porphyry copper deposits are the largest source of copper, and are found in North and South America, Europe, Asia, and Pacific islands. None are documented in Africa. The largest examples are found in the Andes in South America.
Characteristics of porphyry copper deposits include:
Porphyry copper deposits are typically mined by open-pit methods.
Examples of porphyry copper deposits
Porphyry-type ore deposits for metals other than copper
Copper is not the only metal that occurs in porphyry deposits. There are also porphyry ore deposits mined primarily for molybdenum, many of which contain very little copper. Examples of porphyry molybdenum deposits are the Climax, Urad, and Henderson deposits in central Colorado, and the Questa deposit in northern New Mexico.
The US Geological Survey has classed the Chorolque and Catavi tin deposits in Bolivia as porphyry tin deposits.
Some porphyry copper deposits in oceanic crust environments, such as those in the Philippines, Indonesia, and Papua New Guinea, are sufficiently rich in gold that they are called copper-gold porphyry deposits.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Porphyry_copper_deposit". A list of authors is available in Wikipedia.|