The alternative would be to develop new mines, disturb more land, get permits, hire workers, build roads and connect power supplies, tasks that take years.
“With acid mind drainage, that’s already done for you,” said Paul Ziemkiewicz, director of the Water Research Institute at West Virginia University.
Ziemkiewicz began the mine drainage project almost a decade ago, helped by federal subsidies. He had envisioned it as a way to treat runoff, recover critical minerals and raise money for more mine cleanups in West Virginia.
But the Biden administration's ambitious funding for clean energy and a domestic supply of critical minerals broadened that goal.
At the facility, drainage from a one-time coal mine — now closed and covered by a grassy slope — emerges from two pipes, and dumps about 800 gallons per minute into a retention pond.
From there the water is routed through massive indoor pools and a series of large tanks that, with the help of lime to lower the acidity, separate out most of the silicate, iron and aluminum. That produces a pale powdery concentrate that is about 95% rare earth oxides, plus water clean enough to return to a nearby creek.
The Department of Energy is funding research on coal wastes in various states.
“There are literally billions of tons of coal ash and coal waste lying around, across the country. And so if we can go back in and remine those, there’s decades worth of materials there," said Grant Bromhal, the acting director of the Department of Energy’s Division of Minerals Sustainability.
Not only coal, but old copper and phosphate mines also hold potential, Bromhal said.
The country won't be able to recover metals from all of them right away, but technologies the department is helping develop can satisfy a substantial part of demand in the next 20 to 30 years, Bromhal said.
“So if we get into the tens of percents or 50%, I think that’s in the realm of possibility,” he said.
Other solutions to obtain more of these metals are retrieving them from discarded devices and shifting sourcing to friendly nations and away from geopolitical rivals or unstable countries, analysts say. For now, there is only a handful of critical or rare earth mineral mines in the United States, although many more are being proposed.
One final subsidy will be required from the federal government: buy the reclaimed metals at a price that guarantees a commercially viable operation, Ziemkiewicz said.
That way China can't simply buy up the product or use its market dominance to drive down prices and scare away private investors, he said.
Quigley, a former environmental protection secretary of Pennsylvania and a one-time small-city mayor in coal country, hopes to see a facility like Ziemkiewicz's come to the Jeddo mine tunnel system in northeastern Pennsylvania.
The Jeddo has defied decades of efforts to treat its flow, which drains a vast network of abandoned underground mines.
It is a massive source of pollution in the Chesapeake Bay watershed, producing an estimated 30,000 to 40,000 gallons per minute.
Bringing the Little Nescopeck Creek back to life could put people to work cleaning up the stream and creating recreational opportunities from a newly revived waterway, Quigley said.
“This could mean a lot to coal communities, to a lot of people in the coal region,” Quigley said. “And to the country.”