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Extreme weather is making mining waste a major problem

in GREEN ENERGIES
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Extreme weather is making mining waste a major problem
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Around noon one day in January 2019, a dam containing waste from a Brazilian iron mine collapsed, releasing 3.4 million tons of sludge. The cascade killed 272 people and flattened houses and buildings for miles, including the mine’s offices and cafeteria, before emptying into the Paraopeba River in southeastern Brazil.

Such disasters have been increasing in frequency and severity, according to a new report on mining waste management. Published by a trio of environmental groups in late May, the report calls for revamping the industry’s standards. It comes as mining companies around the world ramp up the extraction of minerals needed to transition from fossil fuels to forms of cleaner energy.

Mining produces a lot of waste, often toxic: Byproducts such as lead or arsenic leached from the earth, chemicals such as ammonia and cyanide, and processed rock or wastewater. These so-called “tailings” are stored in vast, sludgy pools as big as lakes and contained by earthen dams. According to Earthworks, MiningWatch Canada and the London Mining Network, which authored the report, current industry standards are far from adequately protecting people and the environment. Their report is backed by an international coalition of more than 150 community groups, environmental organizations, Indigenous communities and scientists. 

Extreme rainfall driven by climate change stresses these structures, known in the industry as tailings dams. “Addressing the problems of mine tailings management is more urgent than ever,” said Jan Morrill, Earthworks’ tailings campaign manager, in a release. “We must prioritize safety over cost.” Dams should be designed to endure the most extreme weather and seismic events possible at any given location, the report said. 

At the same time, the rush toward renewable energy is driving up the need for minerals such as copper or cobalt, used in wind turbines, rechargeable batteries and electric vehicles. The authors estimate that demand for these commodities will rocket by 300 percent to 8,000 percent in the next 30 years. Over time, the quality of ore has also declined, forcing companies to process twice as much earth to obtain the material they seek — doubling the amount of waste produced than before. 

These factors, combined with weak industry regulations, are putting pressure on the thousands of waste dams thought to be in existence. The collapse of the Brazilian mine, owned by the company Vale, in 2019 is one of the most catastrophic in a string of failures that have occurred worldwide. Just four years earlier, a breached iron dam — also Vale-owned — in nearby Mariana, Brazil, killed 19 people. A year before that, a pool of toxic green waste — the size of New York’s Central Park — at a gold-copper mine in British Columbia poured into surrounding lakes, creeks and forests. 

Among the authors’ recommendations for strengthening the dam standards are regular monitoring and inspection of the waste facilities; obtaining ongoing consent from neighboring communities; and annual evacuation drills with community members in case of a ruptured dam. They said new waste dams shouldn’t be built if companies can’t ensure safe evacuations. 

Better yet, the report said, don’t use waste dams at all: “The safest tailings facility is one that is not built.” While some mining may be necessary to foster new technologies, the current trends aren’t sustainable, the report warns. Companies should develop methods to recycle scarce minerals or extract them from unconventional supplies such as wastewater.

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