Quantcast
Environmental News for a Healthier Planet and Life

Help Support EcoWatch

Mining Powers Modern Life, but Can Leave Scarred Lands and Polluted Waters Behind

Insights + Opinion
The Bingham Canyon open-pit copper mine in Utah has operated since 1903. David Guthrie, CC BY 2.0

By Matthew Ross

Modern society relies on metals like copper, gold and nickel for uses ranging from medicine to electronics. Most of these elements are rare in Earth's crust, so mining them requires displacing vast volumes of dirt and rock. Hard rock mining – so called because it refers to excavating hard minerals, not softer materials like coal or tar sands – generated $600 billion in revenues worldwide in 2017.


The Trump administration has revived several controversial mining proposals that previously were blocked or stalemated. They include the Pebble Mine at the headwaters of Alaska's Bristol Bay and leasing around Minnesota's Boundary Waters Canoe Area Wilderness. It also approved a large copper mine in southern Arizona, which was subsequently blocked by a federal court ruling.

I study human-altered landscapes, including areas impacted by mines. Mining operations are major water pollution sources and can cause problems that persist for generations. Their global footprints also directly reshape significant portions of Earth's topography, leaving indelible evidence of human presence.

Digging Deep and Wide

In most locations, concentrations of copper, gold and other elements are too low to be extracted profitably. But in some spots they occur in seams of mineable, high-concentration minerals called ores. The economically viable concentration of a mineral depends largely on its market price. Gold ore can be viable at concentrations as low as 0.0001%, while copper becomes uneconomic below 0.5%.

To reach these deposits underground, miners tunnel, dig open pits or scrape through the earth's surface. The choice of technique depends on factors including how consolidated the ore is, the geologic setting and the depth of the ore.

Deep mines disturb the smallest amount of surface land, but are inherently more dangerous for miners. Far below the earth's surface, crews constantly risk encountering toxic gas fumes or stale air with no life-giving oxygen. Other dangers include earthquakes and equipment failures. In 2010, 33 Chilean miners spent over two months trapped underground in a copper-gold mine after a ramp collapsed, but ultimately were rescued.

Growing international emphasis on mine safety and changes in technology and ore quality have prompted a shift from deep mining to pit mines or surface mines, which access ores from the open air. Pit mines can be up to three-quarters of a mile deep, but typically cover less than 20 square miles. In contrast, surface mines typically extend less than 1,000 feet into the earth's crust, but can extend over hundreds of square miles.

Along with metals such as gold, silver and iron, mines also produce materials including sand and gravel, crushed stone and Portland cement. USGS

Acidic Waters

Accessing ore typically involves blowing apart bedrock, removing it from the shaft or pit and storing waste materials nearby after extracting the ore. In these heaps of loose rock, known as spoil piles, previously buried raw minerals are exposed to air or water. Sulfur-rich compounds in the rock react with oxygen and water, producing sulfuric acid, which can lower the pH of nearby streams to levels comparable to lemon juice or vinegar.

At its worst this process, known as acid mine drainage, can kill most native aquatic life. If acid drainage reaches groundwater, it may persist for decades or centuries and start a cascade of other impacts that impair water quality throughout local river networks.

When acid mine drainage lowers a stream's pH, other metals can also start to melt out of minerals in spoil piles, mine shafts or adjacent soils, leaching into soil and groundwater that intersects these areas. This creates waters with increased levels of cadmium, copper, lead and other heavy metals, which are harmful to aquatic insects, fish and human health.

These effects can be transported far downstream and last for generations. Old and abandoned mines around the world have harmed water quality long after mining has ceased. Their impacts can come as long-term slow leakage, or as sudden discharges like the 2015 Gold King spill near Silverton, Colorado, which released three million gallons of mine wastewater and debris into the Animas River.

According to the U.S. Government Accountability Office, there are at least 161,000 abandoned hardrock mining sites in the U.S. West and Alaska. Of these, at least 33,000 have contaminated water supplies or left piles of mine waste contaminated with arsenic behind.

Altering the Planet's Shape

Mining operations have also left thousands of square miles of land altered. In some cases, particularly mountaintop removal mining, entire land forms are permanently reshaped. For millennia the planet's surface was configured by the slow geologic processes of wind and rain. In contrast, mining alters the very geology, topography, hydrology and ecology of sites within years or decades.

These earth-moving activities represent the kind of effect that has led many environmental scientists to argue that our planet has entered a new geologic epoch – the Anthropocene – where human choices have a greater impact on the earth than purely natural processes. Landscape evolution moves in very slow cycles, so these topographic and geologic impacts may last far longer than mining's effects on water quality. And because geologic processes are slow, scientists don't know how these landscapes will diverge or converge in their future evolution.

Essential and Scarce

Like oil and gas producers, mining companies have to contend with the fact that the products they seek are scarce, and easily extractable pools have already been tapped, leading to decreases in ore quality. But demand for these metals continues to grow.

Rapidly expanding green energy will require extracting vast quantities of rare earth metals to power wind turbines, electric vehicle batteries and solar panels. Cellphones, computers, camera lenses and other goods also contain these materials.

Economic imperatives lead companies to continue to push for new mines, either in the U.S. or abroad, where environmental controls may be weaker. And new projects are likely to move more rock, consume more energy and have longer-lasting impacts than those that preceded them.

Ensuring that mining operations are subject to effective oversight and long-term monitoring, and that companies are held accountable for environmental damages, is a long-term challenge wherever mining takes place. The best way to completely avoid the complications that come from mining more minerals is to reduce consumption of them, make mining processes more efficient and make it more economic to recycle industrial materials and rare earth metals.

Matthew Ross is an assistant professor of water quality at Colorado State University.
Disclosure statement: Matthew Ross receives funding from the National Science Foundation and NASA.

Reposted with permission from our media associate The Conversation.

EcoWatch Daily Newsletter

Healthcare workers admit a coronavirus patient to a special intensive care unit set up outside Milan's San Raffaele hospital, where 55 percent of patients surveyed developed mental health symptoms after recovering from the new coronavirus. MIGUEL MEDINA / AFP via Getty Images

A study from a hospital in Milan, Italy has uncovered another complication to the process of recovering from the new coronavirus. More than half of patients surveyed one month after their treatment had developed a psychiatric disorder.

Read More Show Less
An elephant at Roger Williams Park Zoo in Providence, Rhode Island. In Defense of Animals

By Marilyn Kroplick

The term "zoonotic disease" wasn't a hot topic of conversation before the novel coronavirus started spreading across the globe and upending lives. Now, people are discovering how devastating viruses that transfer from animals to humans can be. But the threat can go both ways — animals can also get sick from humans. There is no better time to reconsider the repercussions of keeping animals captive at zoos, for the sake of everyone's health.

Read More Show Less
Isiais now approaches the Carolinas, and is expected to strengthen into a hurricane again before reaching them Monday night. NOAA

Florida was spared the worst of Isaias, the earliest "I" storm on record of the Atlantic hurricane season and the second hurricane of the 2020 season.

Read More Show Less
A campaign targeting SUV advertising is a project between the New Weather Institute and climate charity Possible. New Weather Institute

To meet its climate targets, the UK should ban advertisements for gas-guzzling SUVs, according to a report from a British think tank that wants to make SUVs the new smoking, as the BBC reported.

Read More Show Less

A company from Ghana is making bikes out of bamboo.

By Kate Whiting

Bernice Dapaah calls bamboo "a miracle plant," because it grows so fast and absorbs carbon. But it can also work wonders for children's education and women's employment – as she's discovered.

Read More Show Less
Scientists say it will take a massive amount of collective action to reverse deforestation and save society from collapse. Big Cheese Photo / Getty Images Plus

Deforestation coupled with the rampant destruction of natural resources will soon have devastating effects on the future of society as we know it, according to two theoretical physicists who study complex systems and have concluded that greed has put us on a path to irreversible collapse within the next two to four decades, as VICE reported.

Read More Show Less

Trending

Researchers have turned to hydrophones, instruments that use underwater microphones to gather data beyond the reach of any camera or satellite. Pxfuel

By Kristen Pope

Melting and crumbling glaciers are largely responsible for rising sea levels, so learning more about how glaciers shrink is vital to those who hope to save coastal cities and preserve wildlife.

Read More Show Less