Porphyry copper deposit - Wikipedia
Porphyry copper deposits are copper ore bodies that are formed from hydrothermal fluids that originate from a voluminous magma chamber several kilometers below the deposit itself. Predating or associated with those fluids are vertical dikes of porphyritic intrusive rocks from which this deposit type derives its name.
Porphyry Deposits: The World’s Largest Source of Copper
2013年7月23日 · Porphyry copper deposits are generally composed of a “plug-like” igneous intrusion – a large magma body that is emplaced beneath a volcanic system. On average these deposits can have a vertical and horizontal extent of 1-2 km and can range from tens of millions to more than one billion tons in size.
Porphyry Copper Deposit Model - USGS Publications Warehouse
This report contains a revised descriptive model of porphyry copper deposits (PCDs), the world’s largest source (about 60 percent) and resource (about 65 percent) of copper and a major source of molybdenum, gold and silver.
Porphyry Copper Systems1 | Economic Geology - GeoScienceWorld
2010年1月1日 · Porphyry Cu systems host some of the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits centered on intrusions; skarn, carbonate-replacement, and sediment-hosted Au deposits in increasingly peripheral locations; and superjacent high- and intermediate-sulfidation epithermal deposits.
Porphyry copper deposit | Ore genesis, Hydrothermal, Magmatic …
Porphyry copper deposits commonly contain hundreds of millions of metric tons of ore that averages a fraction of 1 percent copper by weight; although they are low-grade, the deposits constitute important sources because they may be worked on a large scale at low cost.
Porphyry Deposits - Geology Science
2023年4月23日 · Copper Skarns: Porphyry deposits are often associated with copper skarns, which are zones of mineralization that form at the contact between an intrusive igneous rock and a carbonate rock, such as limestone. Copper skarns are …
Porphyry copper deposits consist of stockwork, disseminated, and breccia-hosted copper mineralization that is generally restricted to plutons and their immediate wall rocks. They may have parts containing skarn. Deposits that may be derived from, or affected by, hypogene and supergene processes are included in the models.
Porphyry Deposits - Earth Sci
Fractures coated by sulphides, or quartz veins with sulphides. To make ore, fractures must be closely spaced; generally grades are better where there are several orientations (directions). If you are doing geochemical soil or stream silt sampling, copper is the best pathfinder element.
Porphyry copper deposits consist of stockwork, disseminated, and breccia-hosted copper mineralization that is generally restricted to plutons and their immediate wall rocks. They may have parts containing skarn. Deposits that may be derived from, or affected by, hypogene and supergene processes are included in the models.
Large tonnage and low grade are characteristic features of porphyry copper deposits. According to Lowell (1974), a deposit should have at least 20 million tonnes of ore containing a minimum average grade of 0.1 % Cu to qualify as a porphyry copper deposit. Reserve and production data compiled by Gilmour (1982) show that all