For many people in government and the auto industry, the main concern is whether there will be enough lithium to meet soaring demand for electric vehicles.

The Inflation Reduction Act, which President Biden signed in August, has raised the stakes for the auto industry. To qualify for several incentives and subsidies in the law, which go to car buyers and automakers and are worth a total of $10,000 or more per electric vehicle, battery makers must use raw materials from North America or a country with which the United States has a trade agreement.

rising fast.

California and other states move to ban internal combustion engines. “It’s going to take everything we can do and our competitors can do over the next five years to keep up,” Mr. Norris said.

One of the first things that Sayona had to do when it took over the La Corne mine was pump out water that had filled the pit, exposing terraced walls of dark and pale stone from previous excavations. Lighter rock contains lithium.

After being blasted loose and crushed, the rock is processed in several stages to remove waste material. A short drive from the mine, inside a large building with walls of corrugated blue metal, a laser scanner uses jets of compressed air to separate light-colored lithium ore. The ore is then refined in vats filled with detergent and water, where the lithium floats to the surface and is skimmed away.

The end product looks like fine white sand but it is still only about 6 percent lithium. The rest includes aluminum, silicon and other substances. The material is sent to refineries, most of them in China, to be further purified.

Yves Desrosiers, an engineer and a senior adviser at Sayona, began working at the La Corne mine in 2012. During a tour, he expressed satisfaction at what he said were improvements made by Sayona and Piedmont. Those include better control of dust, and a plan to restore the site once the lithium runs out in a few decades.

“The productivity will be a lot better because we are correcting everything,” Mr. Desrosiers said. In a few years, the company plans to upgrade the facility to produce lithium carbonate, which contains a much higher concentration of lithium than the raw metal extracted from the ground.

The operation will get its electricity from Quebec’s abundant hydropower plants, and will use only recycled water in the separation process, Mr. Desrosiers said. Still, environmental activists are watching the project warily.

Mining is a pillar of the Quebec economy, and the area around La Corne is populated with people whose livelihoods depend on extraction of iron, nickel, copper, zinc and other metals. There is an active gold mine near the largest city in the area, Val-d’Or, or Valley of Gold.

Mining “is our life,” said Sébastien D’Astous, a metallurgist turned politician who is the mayor of Amos, a small city north of La Corne. “Everybody knows, or has in the near family, people who work in mining or for contractors.”

Most people support the lithium mine, but a significant minority oppose it, Mr. D’Astous said. Opponents fear that another lithium mine being developed by Sayona in nearby La Motte, Quebec, could contaminate an underground river.

Rodrigue Turgeon, a local lawyer and program co-leader for MiningWatch Canada, a watchdog group, has pushed to make sure the Sayona mines undergo rigorous environmental reviews. Long Point First Nation, an Indigenous group that says the mines are on its ancestral territory, wants to conduct its own environmental impact study.

Sébastien Lemire, who represents the region around La Corne in the Canadian Parliament, said he wanted to make sure that the wealth created by lithium mining flowed to the people of Quebec rather than to outside investors.

Mr. Lemire praised activists for being “vigilant” about environmental standards, but he favors the mine and drives an electric car, a Chevrolet Bolt.

“If we don’t do it,” he said at a cafe in La Corne, “we’re missing the opportunity of the electrification of transport.”

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