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Visualizing the Size of Mine Tailings

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VCE Mine Tailings V2

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)
72,000,000,00018,800,000,00010,180,000,0008,850,000,000

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
Copper46%
Gold21%
Iron9%
Coal8%
Phosphate4%
Lead and Zinc3%
Nickel2%
Platinum Group Elements1%
Bauxite1%
Uranium<1%
Chromium<1%
Molybdenum<1%
Tin<1%
Vanadium<1%
Manganese<1%
Niobium<1%
Rare Earths<1%
Lithium<1%
Other minerals1%
Total100%

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.

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Visualizing Gold Consumption vs. Domestic Supply

India’s consumption is 50 times higher than its domestic supply.

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This graphic compares gold demand (in tonnes) versus domestic gold production in ten selected countries.

Visualizing Gold Consumption vs. Domestic Supply

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.

While India and China dominate the demand for gold, both countries face different scenarios when comparing supply gaps.

With its huge jewelry industry, India’s consumption is 50 times higher than its domestic supply. Meanwhile, China produces more than one-third of the gold it demands.

This graphic compares gold demand (in tonnes) versus domestic gold production in 10 selected countries. The data comes from the World Gold Council and was compiled by The Gold Bullion Company as of 2023.

India’s Massive Gold Market

Gold holds a central role in India’s culture, considered a store of value, a symbol of wealth and status, and a fundamental part of many rituals. The metal is especially auspicious in Hindu and Jain cultures.

With a population of over a billion, India tops our ranking with substantial gold demand, primarily for jewelry and gold bars.

CountryGold Production in Tonnes (2023)Gold Consumer Demand Deficit or Surplus
🇮🇳 India15748-733
🇨🇳 China378910-532
🇹🇷 Turkey37202-165
🇺🇸 United States167249-82
🇧🇷 Brazil861769
🇮🇩 Indonesia1334588
🇲🇽 Mexico12715112
🇨🇦 Canada19224168
🇷🇺 Russia32271251
🇦🇺 Australia29424270

China ranks second, with demand driven primarily by gold’s role as a store of value, especially by the People’s Bank of China. Central banks seek gold as a hedge against inflation and currency devaluation. Since 2022, the People’s Bank of China has increased its gold reserves by 316 tonnes.

In third place for gold demand, the U.S. consumed 249 tonnes in 2023, against a domestic supply of 167 tonnes.

Turkey ranks fourth, with mine production in 2023 at 37 tonnes, which is five times lower than its demand of 202 tonnes.

Learn More on the Voronoi App 

To learn more about gold, check out this graphic that shows the value of gold bars in various sizes (as of Aug. 21, 2024).

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Visualized: China’s Steel Demand Through Time

China’s steel demand remains robust, but the breakdown on a sectoral level has shifted since 2010. Which sectors are driving steel consumption?

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streamgraph showing the change in demand by sector for crude steel in China since 2010.

Visualized: China’s Steel Demand Through Time

As the world’s manufacturing powerhouse, China has the highest global demand for crude steel, with the market experiencing remarkable growth since 2010.

In 2023, China’s crude steel demand reached 911 million metric tons. This is up an estimated 50% from 609 million metric tons 13 years earlier. When adding in exports and changes to inventory, China surpassed 1 billion metric tons of steel production for the fifth year in a row.

However, the growth in demand for the metal has not been even across industries. In this graphic, we’ve partnered with BHP to visualize how demand for steel on a sectoral level has shifted between 2010 and 2023.

The Sectors Driving Steel Demand

We observed demand for crude steel across the following sectors:

  • Machinery: machinery used in power, construction, metals and mining, agriculture, tools and parts, etc.
  • Infrastructure: roads, railways, subways, pipelines, etc.
  • Construction: urban and rural housing, office buildings, industrial buildings, WRAC buildings (wholesale, retail, accommodation, catering), etc.
  • Transport: light-duty vehicles, trucks and buses, auto parts, shipbuilding, etc.
  • Consumer Durable Goods: refrigerators, washing machines, air conditioners, microwaves, etc.
  • Metal Goods: containers and hardware, etc.
  • Other: smaller categories, statistical change, etc.

In 2010, the largest share of Chinese demand came from the construction sector. Construction accounted for an estimated 42% of the country’s total steel needs. Machinery (20%) and infrastructure (13%) were the industries with the second- and third-highest demand, respectively.

Over the past 13 years, however, demand has shifted towards the machinery and infrastructure industries.

Sector2010 (%)2023 (%)
Machinery2030
Infrastructure1317
Construction4224
Transport129
Durable Goods78
Other612

The demand for steel from the construction industry is estimated to have dropped from 42% of total demand to 24%, as construction firms purchased 37 million metric tons less steel in 2023 compared to 2010. This slump can, in part, be attributed to the Chinese real estate crisis and developer bankruptcies. Both of these factors led to a slowdown in residential building starts.

The machinery sector, on the other hand, has witnessed incredible growth. It rose from an estimated 20% share of overall Chinese steel demand in 2010 to 30% by 2023, boosted by an influx of equipment renewals. Infrastructure saw approximate growth of 13% to 17% over this timeframe.

Steel Demand for Transportation and Durable Goods

The share of steel used by the transport sector is estimated to have falled from 12% in 2010 to 9% in 2023. However, there was an uptick in the amount of steel used by the industry. It rose from around 73 million metric tons in 2010 to 82 million metric tons 13 years later. And, with more than half of all new electric vehicles (EVs) sold worldwide made in China, the sector could receive support if EVs continue to gain in popularity.

In fact, the green economy needs the steel industry—it remains vital for the production of emerging technologies. As such, it is important that nations take steps towards “cleaning” their steel industries. China is doing so with its focus on carbon capture, utilization, and storage technologies, employing green hydrogen metallurgy, and introducing electric furnaces.

Steel demand for durable goods rose slightly from 2010 to 2023. However, the relatively steady share masks the near-doubling of absolute steel purchased by this sector—up from 43 million metric tons to an estimated 73 million metric tons.

The Path Forward for Steel

The Chinese steel industry remains robust—growing by an estimated 50% from 2010 to 2023—despite significant shifts beneath the surface.

As the energy transition progresses, further changes in industry demand for steel are likely, especially with the increasing prominence of clean technologies, such as EVs. Conversely, demand from the construction industry remains closely tied to the outlook of the country’s housing sector.

BHP is one of the world’s leading iron ore producers. Read more insights in its economic and commodity outlook report.

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