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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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Base Metals

Prove Your Metal: Top 10 Strongest Metals on Earth

There are 91 elements that are defined as metals but not all are the same. Here is a breakdown of the top 10 strongest metals and their applications.

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Prove Your Metal: Top 10 Strongest Metals on Earth

The use of metals and the advancement of human civilization have gone hand in hand — and throughout the ages, each metal has proved its worth based on its properties and applications.

Today’s visualization from Viking Steel Structures outlines the 10 strongest metals on Earth and their applications.

What are Metals?

Metals are solid materials that are typically hard, shiny, malleable, and ductile, with good electrical and thermal conductivity. But not all metal is equal, which makes their uses as varied as their individual properties and benefits.

The periodic table below presents a simple view of the relationship between metals, nonmetals, and metalloids, which you can easily identify by color.

The Periodic Table

While 91 of the 118 elements of the periodic table are considered to be metals, only a few of them stand out as the strongest.

What Makes a Metal Strong?

The strength of a metal depends on four properties:

  1. Tensile Strength: How well a metal resists being pulled apart
  2. Compressive Strength: How well a material resists being squashed together
  3. Yield Strength: How well a rod or beam of a particular metal resists bending and permanent damage
  4. Impact Strength: The ability to resist shattering upon impact with another object or surface

Here are the top 10 metals based on these properties.

The Top 10 Strongest Metals

RankType of MetalExample UseAtomic WeightMelting Point
#1TungstenMaking bullets and missiles183.84 u3422°C / 6192 °F
#2 SteelConstruction of railroads, roads, other infrastructure and appliancesn/a1371°C / 2500°F
#3ChromiumManufacturing stainless steel51.96 u1907°C / 3465°F,
#4TitaniumIn the aerospace Industry, as a lightweight material with strength47.87 u1668°C / 3032°F
#5IronUsed to make bridges, electricity, pylons, bicycle chains, cutting tools and rifle barrels55.85 u1536°C / 2800°F
#6Vanadium80% of vanadium is alloyed with iron to make steel shock and corrosion resistance50.942 u1910°C / 3470°F
#7LutetiumUsed as catalysts in petroleum production.174.96 u1663 °C / 3025°F
#8ZirconiumUsed in nuclear power stations.91.22 u1850°C / 3.362°F
#9OsmiumAdded to platinum or indium to make them harder.190.2 u3000°C / 5,400°F
#10TantalumUsed as an alloy due to its high melting point and anti-corrosion.180.94 u3,017°C / 5462°F

Out of the Forge and into Tech: Metals for the Future

While these metals help to forge the modern world, there is a new class of metals that are set to create a new future.

Rare Earth elements (REEs) are a group of metals do not rely on their strength, but instead their importance in applications in new technologies, including those used for green energy.

MetalUses
NeodymiumMagnets containing neodymium are used in green technologies such as the manufacture of wind turbines and hybrid cars.
LanthanumUsed in catalytic converters in cars, enabling them to run at high temperatures
CeriumThis element is used in camera and telescope lenses.
PraseodymiumUsed to create strong metals for use in aircraft engines.
GadoliniumUsed in X-ray and MRI scanning systems, and also in television screens.
Yttrium, terbium, europiumMaking televisions and computer screens and other devices that have visual displays.

If the world is going to move towards a more sustainable and efficient future, metals—both tough and smart—are going to be critical. Each one will serve a particular purpose to build the infrastructure and technology for the next generation.

Our ability to deploy technology with the right materials will test the world’s mettle to meet the challenges of tomorrow—so choose wisely.

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Base Metals

20 Common Metal Alloys and What They’re Made Of

You can’t find stainless steel, brass, sterling silver, or white gold on the periodic table. Learn about 20 common metal alloys, and what they are made from.

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Every day, you’re likely to encounter metals that cannot be found anywhere on the periodic table.

You may play a brass instrument while wearing a white gold necklace – or maybe you cook with a cast iron skillet and store your leftovers in a stainless steel refrigerator.

It’s likely that you know these common metal alloys by name, and you can probably even imagine what they look and feel like. But do you know what base metals these alloys are made of, exactly?

Common Metal Alloys

Today’s infographic comes to us from Alan’s Factory Outlet, and it breaks down metal and non-metal components that go into popular metal alloys.

In total, 20 alloys are highlighted, and they range from household names (i.e. bronze, sterling silver) to lesser-known metals that are crucial for industrial purposes (i.e. solder, gunmetal, magnox).

20 Common Metal Alloys and What They

Humans make metal alloys for various reasons.

Some alloys have long-standing historical significance. For example, electrum is a naturally-occurring alloy of gold and silver (with trace amounts of copper) that was used to make the very first metal coins in ancient history.

However, most of the common metal alloys on the above list are actually human inventions that are used to achieve practical purposes. Some were innovated by brilliant metallurgists, while others were discovered by fluke, but they’ve all had an ongoing impact on our species over time.

Alloys with an Impact

The Bronze Age (3,000 BC – 1,200 BC) is an important historical period that is rightfully named after one game-changing development: the ability to use bronze. This alloy, made from copper and tin, was extremely useful to our ancestors because it is much stronger and harder than its component metals.

Steel is another great example of an alloy that has changed the world. It is one of the most important and widely-used metals today. Without steel, modern civilization (skyscrapers, bridges, etc.) simply wouldn’t be possible.

While nobody knows exactly who invented steel, the alloy has a widely-known cousin that was likely invented in somewhat accidental circumstances.

In 1912, English metallurgist Harry Brearley had been tasked with finding a more erosion-resistant steel for a small arms manufacturer, trying many variations of alloys with none seeming to be suitable. However, in his scrap metal heap – where almost all of the metals he tried were rusting – there was one gun barrel that remained astonishingly untouched.

The metal alloy – now known to the world as stainless steel – was a step forward in creating a corrosion-resistant steel that is now used in many applications ranging from medical uses to heavy industry.

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