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Porphyry copper deposits represent an important resource and the dominant source of copper that is mined today to satisfy global demand. [6] Via compilation of geological data, it has been found that the majority of porphyry deposits are Phanerozoic in age and were emplaced at depths of approximately 1 to 6 kilometres with vertical thicknesses on average of 2 kilometres. [6]
While pipe sizes in Australia are inch-based, they are classified by outside rather than inside diameter (e.g., a nominal 3 ⁄ 4 inch copper pipe in Australia has measured diameters of 0.750 inches outside and 0.638 inches inside, whereas a nominal 3 ⁄ 4 inch copper pipe in the U.S. and Canada has measured diameters of 0.875 inch outside and ...
Porphyry deposits account for most of the copper and molybdenum world production, 60 and 95 percent of its supply respectively. [1] Porphyry-type ore deposits form in hydrothermal fluid circulation systems developed above and around high-level, subvolcanic felsic to intermediate magma chambers and/or cooling plutons. The ore is temporally and ...
New Mexico is currently the nation's number-three copper-producing state. Copper is produced from two large open-pit porphyry copper operations in Grant County: the Chino Mine and the Tyrone mine. Both mines are owned and operated by Freeport-McMoRan. In 2007, the two mines produced 249 million pounds (113 thousand tonnes) of copper, as well as ...
The porphyry copper deposit is made up mainly of fine disseminations, nests and veinlets (0.02÷3 cm) of pyrite, chalcopyrite, and magnetite; gold included in the chalcopyrite and pyrite, and secondary minerals: bornite, covellite, chalcocite, sphalerite, galena, molybdenite, germanite, malachite, azurite and is developed in microdioritic rocks ...
At first, mining was confined to placer gold, lead-silver, and copper-gold. Porphyry copper required processing and a railroad, which reached the canyon in 1873. [17]: 61–62 [18] Enos Andrew Wall started working claims in 1887. His extensive tunnels and test pits, on his 200-acre (81 ha), indicated ore containing 2% copper. [17]
A male humpback whale made one of the longest and most unusual migrations on record for the species, an anomaly scientists say might be linked to climate change.
Chuquicamata belongs to the broad class of porphyry copper deposits. Practically, the entire Chuquicamata orebody is hosted by the Chuqui Porphyry Complex, made up of East, Fine Texture, West and Banco porphyries. These Cu-Mo porphyry systems formed during the Eocene-Oligocene and exhibit classic "zoned alteration-mineralization features.