The U.S. Supreme Court has denied review of a case centered on mining around the Grand Canyon.
The Obama administration put about 1,562 square miles near the national park off-limits to new mining claims until 2032. It was meant to slow a flurry of claims over concern that a major water source in the West could become contaminated.
The mining industry asked the Supreme Court in March to review the ban, saying it was based on an unconstitutional provision of federal law. The high court declined Monday.
National Mining Association spokeswoman Ashley Burke says the ban is unwarranted and makes the U.S. even more dependent on imports.
Environmentalists hailed the high court's decision but are worried the Trump administration could end the ban.