Atop a long-dormant volcano in northern Nevada, workers are preparing to start blasting and digging out a giant pit that will serve as the first new large-scale lithium mine in the United States in more than a decade — a new supply of an essential ingredient in electric car batteries and renewable energy.

The mine, constructed on leased federal lands, could help address the nearly total reliance on foreign sources of lithium.

But the project, known as Lithium Americas, has drawn protests from members of a Native American tribe, ranchers and environmental groups because it is expected to use billions of gallons of precious groundwater, potentially contaminating some of it for 300 years, while leaving behind a giant mound of waste.

The fight over the Nevada mine is emblematic of a fundamental tension surfacing around the world: Electric cars and renewable energy may not be as green as they appear. Production of raw materials like lithium, cobalt and nickel that are essential to these technologies are often ruinous to land, water, wildlife and people.

That environmental toll has often been overlooked in part because there is a race underway among the United States, China, Europe and other major powers for supremacy over minerals that could help countries achieve economic and technological dominance for decades to come.

This friction helps explain why a contest of sorts has emerged in recent months across the United States about how best to extract and produce the large amounts of lithium in ways that are much less destructive than how mining has been done for decades.

Some investors are backing alternatives including a plan to extract lithium from briny water beneath California’s largest lake, the Salton Sea, about 600 miles south of the Lithium Americas site.

At the Salton Sea, investors plan to use specially coated beads to extract lithium salt from the hot liquid pumped up from an aquifer more than 4,000 feet below the surface. The self-contained systems will be connected to geothermal power plants generating emission-free electricity. And in the process, they hope to generate the revenue needed to restore the lake, which has been fouled by toxic runoff from area farms for decades.

The United States needs to quickly find new supplies of lithium as automakers ramp up manufacturing of electric vehicles. Even though the United States has some of the world’s largest reserves, most of the raw lithium used domestically comes from Latin America or Australia, and most of it is processed and turned into battery cells in China and other Asian countries.

While producing 66,000 tons a year of battery-grade lithium carbonate, the Lithium Americas’ open-pit mine may cause groundwater contamination with metals including antimony and arsenic, according to federal documents.

The lithium will be extracted by mixing clay dug out from the mountainside with as much as 5,800 tons a day of sulfuric acid. This whole process will also create 354 million cubic yards of mining waste.

A December assessment by the Interior Department found that over its 41-year life, the mine would degrade nearly 5,000 acres of winter range used by pronghorn antelope and hurt the habitat of the sage grouse.