The order establishes a 20-year mining ban on 225,000 acres next to the Minnesota wilderness, further crippling a Chilean firm's plans for a copper mine.
Zinke, who is now running for Congress, was plagued by scandals during his time in the administration, but the Department of Justice declined to prosecute him.
For the first time, the U.S. government is formally acknowledging the scope of its former policy aimed at erasing Native American identity.
Over 500 Native children died at boarding schools the federal government forced them to attend over a 150-year period, the Interior Department reported.
This week's auction grossed more than any federal offshore oil and gas lease sale in U.S. history, according to the Interior Department.
U.S. Interior Secretary Deb Haaland has formally declared the term "squaw" to be derogatory and wants to remove the word from use by the federal government.
But its recommendation stopped short of the outright ban pushed by environmental groups.
The Interior Department's Ben Cassidy had direct contact with former NRA colleagues and helped install gun advocates on two advisory councils.
The Trump administration's controversial relocation of the Bureau of Land Management headquarters resulted in hundreds of staff departures.
"I am going to let it rip from the Bison account," a high-ranking Interior Department spokesperson wrote before taking to the agency's troll handle to "fact-check."