Mining
Everything You Need to Know on VMS Deposits
Everything You Need to Know about VMS Deposits
People are often not aware of where their most prized devices really come from.
Phones, cars, and computers might not seem like the most natural objects. But the metals that make them come from natural processes deep in the earth’s crust – processes that have been going on for 3.4 billion years, and continue to this day.
Today’s visualization comes to us from Foran Mining Corp. and goes in depth to show how one type of mineral deposit, Volcanogenic Massive Sulphide or “VMS”, forms and is the primary source for many of the materials that make the modern world.
What is a VMS Deposit?
Volcanogenic Massive Sulphide (VMS) deposits are one of the richest sources of metals such as copper, lead, and zinc globally. VMS deposits can also produce economic amounts of gold and silver as byproducts of mining these deposits.
Currently, global metal production from VMS deposits account for 22% of zinc, 9.7% of lead, 6% of copper, 8.7% of silver and 2.2% of gold.
Where are VMS deposits found?
VMS deposits occur around the globe and often form in clusters or camps, following the tectonic plate boundaries in areas of ancient underwater volcanic activity.
Natural processes underway today are forming the VMS deposits of tomorrow. This gives scientists an incredible advantage in witnessing how VMS deposits form and gives a special advantage to geologists for what to look for.
Mineralization and Formation
The geological processes that form VMS deposits occur at the depths of the ocean and are associated with volcanic and/or sedimentary rocks.
At sections where the Earth’s crust is thin due to faulting or separation of tectonic plates, the magma heats up the ocean floor.
As the Earth’s crust heats up, the ground softens and allows heated magma to escape towards the ocean or crust contact, the early beginning of a volcano and the deposition of minerals into the ocean floor from magma. Also, the heated ground cracks and begins a process that draws in sea water into the crust which becomes super-heated and imbued with minerals. Black and white smokers expel this seawater back to the surface.
Black and white smokers exhale a mineral rich-plume that spreads out over the ocean floor. As it moves farther and farther away from its heat source, the plume precipitates minerals onto the ocean floor. Over time, the continual activity of the smokers and their mineral rich plumes create mineralized beds that become VMS deposits.
With the movement of the Earth’s tectonic plates, these mineral rich beds are transposed and can be found on land that was once underwater.
How Big Can VMS Deposits Get?
Current resource and historical production figures from 904 VMS deposits around the world average roughly 17 million tonnes (“Mt”), of which is approximately 1.7% copper, 3.1% zinc, and 0.7% lead.
A few giant mineral deposits (greater than 30 Mt) and several copper-rich and zinc-rich deposits of median tonnage (~2 Mt) skew the averages.
Several large VMS camps are known in Canada, including the Flin Flon, Bathurst and Noranda camps. The high-grade deposits within these camps are often in the range of five to 20 million tonnes of ore and can be much larger.
Meanwhile, approximately 90 VMS deposits have been discovered in the Iberian Pyrite Belt which runs through Portugal and Spain. Several of these are larger than 100 million tonnes, making this region one of the most significant hosts to VMS deposits in the world.
Uranium
Charted: Global Uranium Reserves, by Country
We visualize the distribution of the world’s uranium reserves by country, with 3 countries accounting for more than half of total reserves.
Charted: Global Uranium Reserves, by Country
This was originally posted on our Voronoi app. Download the app for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.
There can be a tendency to believe that uranium deposits are scarce from the critical role it plays in generating nuclear energy, along with all the costs and consequences related to the field.
But uranium is actually fairly plentiful: it’s more abundant than gold and silver, for example, and about as present as tin in the Earth’s crust.
We visualize the distribution of the world’s uranium resources by country, as of 2021. Figures come from the World Nuclear Association, last updated on August 2023.
Ranked: Uranium Reserves By Country (2021)
Australia, Kazakhstan, and Canada have the largest shares of available uranium resources—accounting for more than 50% of total global reserves.
But within these three, Australia is the clear standout, with more than 1.7 million tonnes of uranium discovered (28% of the world’s reserves) currently. Its Olympic Dam mine, located about 600 kilometers north of Adelaide, is the the largest single deposit of uranium in the world—and also, interestingly, the fourth largest copper deposit.
Despite this, Australia is only the fourth biggest uranium producer currently, and ranks fifth for all-time uranium production.
Country | Share of Global Reserves | Uranium Reserves (Tonnes) |
---|---|---|
🇦🇺 Australia | 28% | 1.7M |
🇰🇿 Kazakhstan | 13% | 815K |
🇨🇦 Canada | 10% | 589K |
🇷🇺 Russia | 8% | 481K |
🇳🇦 Namibia | 8% | 470K |
🇿🇦 South Africa | 5% | 321K |
🇧🇷 Brazil | 5% | 311K |
🇳🇪 Niger | 5% | 277K |
🇨🇳 China | 4% | 224K |
🇲🇳 Mongolia | 2% | 145K |
🇺🇿 Uzbekistan | 2% | 131K |
🇺🇦 Ukraine | 2% | 107K |
🌍 Rest of World | 9% | 524K |
Total | 100% | 6M |
Figures are rounded.
Outside the top three, Russia and Namibia both have roughly the same amount of uranium reserves: about 8% each, which works out to roughly 470,000 tonnes.
South Africa, Brazil, and Niger all have 5% each of the world’s total deposits as well.
China completes the top 10, with a 3% share of uranium reserves, or about 224,000 tonnes.
A caveat to this is that current data is based on known uranium reserves that are capable of being mined economically. The total amount of the world’s uranium is not known exactly—and new deposits can be found all the time. In fact the world’s known uranium reserves increased by about 25% in the last decade alone, thanks to better technology that improves exploration efforts.
Meanwhile, not all uranium deposits are equal. For example, in the aforementioned Olympic Dam, uranium is recovered as a byproduct of copper mining occurring at the same site. In South Africa, it emerges as a byproduct during treatment of ores in the gold mining process. Orebodies with high concentrations of two substances can increase margins, as costs can be shared for two different products.
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