Porphyry Deposits: General characteristics and modeling ...

Magmas with a high oxidation state (FMQ +1 to +2), a high-water content (≥ 4 wt % H2O) and a high degree of fractionation are necessary to form porphyry copper deposits (PCDs).

Researchers examine how ore deposits are formed

Every year, the world consumes about 20 million tons of copper primarily for construction materials like electrical wiring and water pipes. Most nonrecycled supplies come from porphyry copper deposits (PCDs), which form when hot, metal-bearing fluids percolate up through Earth's crust. But while geologists have long recognized — and exploited — PCDs, two new studies suggest they may need ...

Copper deposits - and why they are getting hard to find.

Jan 23, 2015· Understand how the metals were formed. The nickel sulphide deposits in Sudbury, Thompson and Voisey's Bay were formed when a sulphide magma unable to mix transformed into a silicate magma. This is similar to the process of mixing oil and vinegar, except in molten rock, which is formed at temperatures over 1000 degrees.

Understanding the copper heart of volcanoes

These processes are efficient at forming copper, chromium, and gold deposits. At divergent boundaries on the surface of the Earth, evaporating seas will form extensive evaporite deposits of salt ...

Plate Tectonics and the Location of Mineral Deposits ...

While sedimentary copper deposits share the feature of a sedimentary origin, there are many different types of sedimentary copper deposits, each with distinct characteristics.

Everything You Need to Know About Copper Porphyries ...

Copper deposits are broadly classified on the basis of how the deposits formed. Porphyry copper deposits, which are associated with igneous intrusions, yield about two-thirds of the world's copper and are therefore the world's most important type of copper deposit.

Sedimentary Copper Deposits | INN

copper deposits form in black smokers because. seawater is heated by hot rocks and rises to the seafloor. why would deposits of iron ore form in the setting shown here? magma releases metal rich fluids that react with rocks like limestone. most of the worlds platinum comes from.

How Are Porphyry Copper Deposits Formed - Porphyry - News ...

Jul 23, 2013· Porphyry copper deposits can also be associated with epithermal gold deposits formed by the same volcanic complex above the deeper-seated porphyry. If alternation occurs in carbonate-rich rocks, then unusual skarn mineralisation can also develop.

Sediment-Hosted Copper Deposits of the World: Deposit ...

copper deposits were formed during late Cretaceous to early Eocene time (75 to 51 million years ago). The one exception to this rule is Bisbee, which dates from early Jurassic time (180 million years ago). Although copper has been mined from a number of different types of mineral deposits, porphyry

How copper is made - material, used, processing, steps ...

Mar 11, 2015· Porphyry deposits are very large, polymetallic systems that typically contain copper along with other important metals. Much of today's mineral production depends on porphyries: 60% of copper, 95% of molbdenum, and 20% of gold comes from this deposit type. Where and How are Porphyries Formed?

how are copper deposits formed - Hitlers Hollywood

Therefore large low-grade copper ore bodies associated with porphyritic intrusive rocks can be referred to as copper porphyry deposits. Some of those deposits are very large. For example the Great Copper Mountain was a mine in Falun, Sweden that was open for nearly a millennium before it …

Copper deposits - and why they are getting hard to find.

Copper deposits are broadly classified on the basis of how the deposits formed. Porphyry copper deposits, which are associated with igneous intrusions, yield about two-thirds of the world's copper and are therefore the world's most important type of copper deposit.

Find out how copper and nickel deposits are formed

Therefore large low-grade copper ore bodies associated with porphyritic intrusive rocks can be referred to as copper porphyry deposits. Some of those deposits are very large. For example the Great Copper Mountain was a mine in Falun, Sweden that was open for nearly a millennium before it …

What is a Porphyry Copper Deposit?

Mineral deposit - Mineral deposit - Formation of mineral deposits: Mineral deposits form because some medium serves as a concentrating and transporting agent for the ore minerals, and some process subsequently causes the transporting agent to precipitate, or deposit, the minerals. Examples of concentrating and transporting agents are groundwater, seawater, and magma; examples of …

Everything You Need to Know About Copper Porphyries ...

Aug 04, 2015· Copper forms as molten rock with small amounts of copper fluid crystallizes. As the larger rock continues to solidify, the fluid rich in copper moves into cracks, eventually solidifying as well. Because the copper solidifies later than other minerals within the larger rock, the final deposits have a high concentration.

What is a Porphyry Copper Deposit?

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. In later stages, circulating meteoric fluids may interact with the magmatic ...

(PDF) How Much Water in Basaltic Melts Parental to ...

Porphyry copper deposits are formed by aqueous fluids exsolved by differentiated, mantle-derived magmas variably mixed with crustal melts. Water is essential to form porphyry Cu mineralization ...

Studies re-examine how major copper deposits form | EARTH ...

how are copper deposits formed. Porphyry copper deposits are copper orebodies 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

(PDF) The formation of porphyry copper deposits

Jul 15, 2010· Despite the similarity, copper deposits formed near the Keweenaw Fault remain the largest. "We've never found any other place that has had this mass of mineable native copper," Bornhorst said. That mass of mineable native copper remains the largest on Earth.

geology 101 final Flashcards | Quizlet

Sep 15, 2019· The deposits that contain the largest quantities of copper are called porphyry deposits, and the process of extracting it usually involves drilling an open pit into a layer of sedimentary rock. How Copper Forms in the Earth. To understand how copper is formed, it helps to look at how porphyry deposits—the largest current sources of copper ore ...

How Ore Deposits Are Formed? - Geology In

copper deposits were formed during late Cretaceous to early Eocene time (75 to 51 million years ago). The one exception to this rule is Bisbee, which dates from early Jurassic time (180 million years ago). Although copper has been mined from a number of different types of mineral deposits, porphyry

Geology of Copper | Properties, Mining, and Formation of ...

For a sediment-hosted copper deposit to form, four conditions are required: 1. There must be an oxidized source rock. This rock must be hematite stable and must contain ferromagnesian minerals or mafic rock fragments from which copper can be . 5 leached. In Zambia erosion of an early-formed porphyry copper deposit is thought to have