Real Assets
Visualizing the Size of Mine Tailings
Visualizing the Size of Mine Tailings
On January 25th, 2019, a 10-meter tall wave traveling 120 km/h, washed 10 million m3 of mining waste from the Brumadinho tailings dam over the Brazilian countryside killing somewhere between 270 and 320 people.
This was a manmade disaster, made from mining the materials we use daily. Every copper wire in your house, steel frame in an EV, or any modern appliance comes from mining.
Mining leaves behind waste in the form of tailings stored in dams or ponds around the world. This infographic takes a look at the estimated size of one part of this waste, tailings, visualized next to the skyline of New York City as a benchmark.
Quantifying Mining’s Material Impact
In the wake of the Brumadinho tailings failure, the International Council on Mining and Metals (ICMM) began a review with institutional investors and the United Nations Environment Programme (UNEP), to survey tailings facilities around the world.
The Global Tailings Review tracked a total of 1,743 unique facilities containing 44,540,000,000 m3 of tailings. This dataset represents only 30.2% of global commodity production.
However, the review estimated the total number of active, inactive, and closed facilities is around 8,500. If we use the assumptions for the 1,743 estimate to calculate for the 8,500 facilities, a total of 217,330,652,000 m3 of tailings are in storage globally.
What are Tailings?
Not all rock that comes out of the ground is metal. Miners find, remove, and refine rocks that carry a small amount of metal we need.
According to the USGS, 72 billion tonnes of material produced just over 10 billion tonnes of ore. Only 14% mined material makes it to processing for metals.
Waste rock (tonnes) | Material Sent to Mill (tonnes) | Ore Produced (tonnes) | Tailings (tonnes) |
---|---|---|---|
72,000,000,000 | 18,800,000,000 | 10,180,000,000 | 8,850,000,000 |
Tailings are what is left over after mills separate the metal from the mined rock. The processed material “tailings” comes from the “tail” end of a mining mill and comprise fine particles mixed with water forming a slurry. Mining companies will store this waste in dams or ponds.
Not All Minerals Are Equal: Tailings Contribution by Commodity
Not all minerals are equal in their contribution to tailings. The grade, quantity, and the process to extract the valuable metals affect each metal’s material impact.
Mineral | % Contribution to Global Tailings |
---|---|
Copper | 46% |
Gold | 21% |
Iron | 9% |
Coal | 8% |
Phosphate | 4% |
Lead and Zinc | 3% |
Nickel | 2% |
Platinum Group Elements | 1% |
Bauxite | 1% |
Uranium | <1% |
Chromium | <1% |
Molybdenum | <1% |
Tin | <1% |
Vanadium | <1% |
Manganese | <1% |
Niobium | <1% |
Rare Earths | <1% |
Lithium | <1% |
Other minerals | 1% |
Total | 100% |
A renewable future will be mineral intensive and will inevitably produce more mining waste, but growing awareness around mining’s true cost will force companies to minimize and make the most of their waste.
Turning a Liability into an Asset
While tailings are waste, they are not useless. Researchers know there remains economic value in tailings. Natural Resources Canada estimated that there is $10B in total metal value in Canadian gold mining waste.
Rio Tinto has produced borates from a mine in the Mojave Desert which has left behind more than 90 years’ worth of tailings. The company was probing the tailings for gold and discovered lithium at a concentration higher than other U.S. projects under development.
According to UBC’s Bradshaw Initiative for Minerals and Mining professor Greg Dipple, the mining industry could help society store carbon. For over a decade, he has researched a process in which tailings naturally draws CO₂ from the air and traps it in tailings.
A Material World
While the majority of mining companies manage tailing dams safely, the issue of the material impacts of mining on Earth remains.
Mining of metal has grown on average by 2.7% a year since the 1970s, and will continue to grow. The importance of the size of tailings is critical to address proactively, before it comes rushing through the front door, as it did in Brazil.
Real Assets
Visualizing Mining’s Footprint in British Columbia
Mining represents 7% of British Columbia’s GDP despite only accounting for 0.04% of the land use.

Visualizing Mining’s Footprint in British Columbia
British Columbia is considered a global leader in the development of socially and environmentally responsible resources.
An estimated 54% of the province’s total land is protected, making it one of the world’s greenest mining hubs.
This graphic by the B.C. Regional Mining Alliance (BCRMA) details mining’s footprint in the province.
A Tier 1 Jurisdiction for Mining
British Columbia covers almost 95 million hectares (234 million acres), more than any European country except Russia, and more than any U.S. state except Alaska.
As the largest mining province in Canada, BC registered $18 billion in revenue from the industry in 2022.
British Columbia stands as Canada’s sole producer of molybdenum, which finds applications in metallurgy and chemistry. Additionally, B.C. is the country’s leader producer of copper and steelmaking coal, besides gold and silver.
At the heart of British Columbia’s mining industry lies the Golden Triangle, one of the hottest mineral exploration districts in the world.
More than 150 mines have operated in the area since prospectors first arrived at the end of the 19th century. The region alone is endowed with minerals worth more than $800 billion.
How Green is B.C. Mining
Mining represents 7% of the province’s Gross Domestic Product (GDP), despite only accounting for 0.04% of the land use. In comparison, farmland demands 3% of the land, bringing $2.1 billion (0.8%) per year.
Land Use in B.C. | Revenue (2022, CAD $) | |
---|---|---|
Mining | 0.04% | $18.0 billion |
Oil & Gas | 0.4% | $9.5 billion |
Infrastructure | 1% | $25.0 billion |
Farmland | 3% | $2.1 billion |
Forest | 62% | $13.3 billion |
Mining operations are also supported by a stable, transparent, and effective policy environment. The province ranked as the world’s least risky for mining in 2017 and 2018.
In addition, mineral exploration has received ample support from local Indigenous communities. Today, mining accounts for over two-thirds of all indigenous people employed in the extractives sector.
According to the International Energy Agency, up to six times more minerals and metals will be needed by 2040 to accelerate the energy transition.
In this scenario, British Columbia is well positioned to support the transition to a low-carbon future and make a significant contribution to climate action.
The BCRMA is a strategic partnership between indigenous groups, industry, and government representatives that aims to promote B.C.’s mining opportunities internationally.
Real Assets
Mapped: The 10 Largest Undeveloped Silver Deposits in the World
Global silver demand is poised to soar in the next decade, driven by emerging technologies like EVs and solar power.

Ranked: The Largest Undeveloped Silver Deposits in the World
Global silver demand is poised to soar in the next decade, driven by emerging technologies like electric vehicles and solar power.
Silver demand from solar alone has grown from less than 50 million ounces (Moz) a decade ago to an expected 160 Moz in 2023.
So, where will the necessary supply come from to meet this surge? This graphic from Discovery Silver shows the largest undeveloped silver deposits in the world.
Silver in Green Technology
Silver is a vital part of solar cells. The metal is converted into paste and coated onto silicon wafers to make solar arrays.
When sunlight hits the silicon, silver helps to transport the generated electricity for immediate use or store it in batteries. A typical solar panel can contain as much as 20 grams of silver.
Silver’s conductivity and corrosion resistance are vital in electronics, especially electric vehicles where nearly all electrical connections rely on the metal. Over 50 million ounces of silver are used every year to enhance conductivity in powered seats, windows, and other vehicle electronics.
In 2022, 27% of all silver consumption in the U.S. was attributed to electrical and electronics, while 10% was linked to solar technology.
Global Silver Demand Rising
With the increasing demand for new technologies combined with physical investment (bars) demand, the silver market saw a 237.7 Moz deficit in 2022, an all-time record.
2023 silver industrial demand is forecasted to rise by 4% to a new record high.
However, according to the Silver Institute, mined output is expected to decline over the next five years.
In this scenario, new mines are expected to play an important role in meeting the demand.
Currently, the world’s top 10 undeveloped silver deposits contain 984 Moz. Discovery Silver’s Cordero project in Mexico leads the ranking:
Rank | Project | Owner | Country | Contained Silver Reserves (Moz) |
---|---|---|---|---|
1 | Cordero | Discovery Silver | Mexico | 266 |
2 | Corani | Bear Creek Mining Corporation | Peru | 229 |
3 | Prognoz | Polymetal International plc | Russia | 125 |
4 | Bowdens | Silver Mines Limited | Australia | 66 |
5 | Santa Ana | Formerly Bear Creek | Peru | 63 |
6 | Fuwan | Minco Silver Corporation | China | 55 |
7 | Nueva Esperanza | Kingsgate Consolidated Limited | Chile | 48 |
8 | Vares | Adriatic Metals PLC | Bosnia & Herzegovina | 47 |
9 | Terronera | Endeavour Silver Corp. | Mexico | 47 |
10 | Menkechka | GeoProMining Ltd. | Russia | 38 |
Cordero is located in Chihuahua State in Mexico, one of the world’s most prolific silver producing regions.
Once in production, it is expected to become one of the top three silver mines in the world.
As silver demand is expected to soar, Discovery Silver offers direct investment exposure to this paradigm shift through its Cordero Project. Click here to learn more about Discovery Silver.
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