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Everything You Need to Know About Copper Porphyries

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Everything You Need to Know About Copper Porphyries

Everything You Need to Know About Copper Porphyries

Presented by Entrée Gold

What is a Porphyry?

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?

Porphyries are most commonly found along the west coast of North and South America, as well as in the Southwest Pacific.

Porphyries are formed in tectonic plate convergent zones where oceanic crust has subducted beneath the continental crust, and in some cases the oceanic crust. As the plate subducts, the overlying upper mantle partially melts and the liquid magma rises to the surface. Hot fluids rise to the surface by flowing through cracks and fissures. Metals precipitate out of the solution as fluid cools and moves away from the heat source and pressure.

Mineralization

In porphyry mineralization, there are many economic minerals that can be found: copper, gold, molybdenum, silver, lead, zinc, tin, and tungsten. There are also associated mineral deposits that can form that depend on the host rock and the distance from the heat source. These include skarn, epithermal, and breccia type deposits.

Four Things to Know on Porphyries

  1. Polymetallic nature – Each porphyry is unique and holds different concentrations of minerals. Some deposits have such high concentrations of gold that they may be considered gold deposits rather than copper deposits. Others have barely any gold at all but may have plenty of molybdenum.
  2. Large Size, Low Grade – Porphyries typically have 100 million to 5 billion tonnes of ore with a lower grade (0.2% to >1% copper). It is the size of these deposits that allow for bulk mining and economies of scale.
  3. Long Mine Life – The size of porphyry systems usually mean that the life of the mine can be multi-decades long. This means that these deposits last through multiple market cycles, and are thus not as vulnerable to challenging market environments compared to other smaller mines.
  4. Infrastructure is Key – In order to process large amounts of ore, infrastructure can be a large part of initial capital expenditures (CAPEX). Access to power and water are key issues as large amounts of both are needed to process ore. The footprint of the mine and volume of tailings disposal can also make porphyries more challenging to permit.

Example Porphyry

Each year the Bingham Canyon Mine, located in Utah and owned by Rio Tinto and in production since 1906, produces approximately:

  • 300,000 tons of copper
  • 400,000 oz of gold
  • 4,000,000 oz of silver
  • 30,000,000 lbs of molybdenum

The value of the resources extracted to date from the Bingham Canyon Mine is greater than the Comstock Lode, Klondike, and California gold rush mining regions combined.

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White Gold: Mapping U.S. Lithium Mines

In this graphic, Visual Capitalist partnerered with EnergyX to explore the size and location of U.S. lithium mines.

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Teaser graphic of a map that shows the sizes of the top U.S. lithium mines.

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The following content is sponsored by EnergyX

White Gold: Mapping U.S. Lithium Mines

The U.S. doubled imports of lithium-ion batteries for the third consecutive year in 2022, and with EV demand growing yearly, U.S. lithium mines must ramp up production or rely on other nations for their supply of refined lithium.

To determine if the domestic U.S. lithium opportunity can meet demand, we partnered with EnergyX to determine how much lithium sits within U.S. borders. 

U.S. Lithium Projects

The most crucial measure of a lithium mine’s potential is the quantity that can be extracted from the source.

For each lithium resource, the potential volume of lithium carbonate equivalent (LCE) was calculated with a ratio of one metric ton of lithium producing 5.32 metric tons of LCE. Cumulatively, existing U.S. lithium projects contain 94.8 million metric tons of LCE.

RankProject NameLCE, million metric tons (est.)
1McDermitt Caldera21.5
2Thacker Pass19.1
3Tonopah Flats18.0
4TLC Lithium10.7
5Clayton Valley (Century Lithium)6.3
6Zeus Lithium6.3
7Rhyolite Ridge3.4
8Arkansas Smackover (Phase 1A)2.8
9Basin Project2.2
10McGee Deposit2.1
11Arkansas Smackover (South West)1.8
12Clayton Valley (Lithium-X, Pure Energy)0.8
13Big Sandy0.3
14Imperial Valley/Salton Sea0.3

U.S. Lithium Opportunities, By State

U.S. lithium projects mainly exist in western states, with comparatively minor opportunities in central or eastern states.

StateLCE, million metric tons (est.)
Nevada88.2
Arkansas4.6
Arizona2.5
California0.3

Currently, the U.S. is sitting on a wealth of lithium that it is underutilizing. For context, in 2022, the U.S. only produced about 5,000 metric tons of LCE and imported a projected 19,000 metric tons of LCE, showing that the demand for the mineral is healthy.  

The Next Gold Rush?

U.S. lithium companies have the opportunity to become global leaders in lithium production and accelerate the transition to sustainable energy sources. This is particularly important as the demand for lithium is increasing every year.

EnergyX is on a mission to meet U.S. lithium demands using groundbreaking technology that can extract 300% more lithium from a source than traditional methods.

You can take advantage of this opportunity by investing in EnergyX and joining other significant players like GM in becoming a shareholder.

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