The American Exploration & Mining Association was joined by a coalition in filing a challenge last Friday in the Wyoming district court.
The company's Flat gold project is located 40 km north of the giant Donlin gold project.
Chile's financial regulator had allowed a planned lithium joint venture between SQM and Codelco to proceed without a vote by SQM shareholders.
There are some 10,000 mining claims in Grassy Narrows’s interim area of interest for over more than 2,850 sq. km in the province’s far northwest.