U.S. Agriculture Secretary Tom Vilsack told reporters that the White House has not decided on the fate of the Twin Metals copper mining project in Minnesota, as it works to balance economic growth and strong opposition from environmentalists.

Twin Metals and its supporters, including several Minnesota labor unions, have said the project can be constructed safely and boosts the region’s economy with good-paying jobs. Opponents of the mine argue the mine could have a negative impact on the Boundary Waters Canoe Area Wilderness on the U.S.-Canada border.

The Biden administration is “trying to find the balance between preserving a pristine area, and at the same time looking for ways in which job growth, economic growth can take place in rural areas. And that’s what we’re going to attempt to do. There are no final decisions being made on this,” Vilsack told reporters in a White House briefing.

Reuters reported that the mine would, if built, be a major supplier of copper to the United States as Biden aims to build more electric vehicles, which use twice as much of the red metal as those with internal combustion engines.

The Obama administration had started a two-year process that would have banned copper mining in the Boundary Waters region for 20 years. But Trump put that process on hold, effectively letting mine planning continue.

Representatives for Twin Metals, which is controlled by Chile’s Antofagasta Plc, said the company expects the regulatory review process “to remain fair and based on science and law in the years ahead.”

Former U.S. President Barack Obama’s administration had started a two-year process that would have banned copper mining in the Boundary Waters region for 20 years. But his successor, Donald Trump, put that process on hold, effectively letting mine planning continue.

Some of Twin Metals’ leases for the land also expired under Obama, though Trump reissued them.

Environmentalists had been expecting the Agriculture Department, which oversees the U.S. Forest Service, the agency that controls federal lands in the region, to restart the review process for the 20-year ban and also pull the land leases.

Representative Betty McCollum, a Minnesota Democrat, introduced a bill last month that would ban mining in the region. Biden only has the power to block mining for 20 years in the region, though Congress can permanently block it.

In March, Vilsack moved to temporarily block another controversial copper mine, Rio Tinto Plc’s Resolution Copper project in Arizona.