Native Americans say U.S. does not own land it is about to give to Rio Tinto

A view of the future block cave mine planned by mining company Rio Tinto in the Tonto National Forest near Superior, Arizona May 30, 2015. Considered a home to the San Carlos Apache tribe, the site is slated for development into a copper mine by Rio Tinto. REUTERS/Deanna Dent/File Photo

Jan 14 (Reuters) - Members of Arizona's San Carlos Apache tribe filed a property lien on Thursday in an attempt to regain control over land that the U.S. government is poised to give to Rio Tinto Ltd (RIO.AX)(RIO.L) for the Resolution Copper mine.

The latest maneuver by tribal members opposed to the project asks a court to find that the U.S. government has illegally occupied the land for more than 160 years and has no right to give it to anyone.

The "United States of America does not own that land," Apache Stronghold, a non-profit organization comprised of mine opponents, said in a court filing.

The mine could supply a quarter of U.S. copper demand if developed, but eventually destroy the land, known as Oak Flat, or Chi'chil Bildagotee, considered by Native Americans to be the home of religious deities. read more

Rio's Resolution Copper subsidiary said it will monitor the case and remains "committed to ongoing engagement with Native American tribes to continue shaping the project and deliver initiatives that recognize and protect cultural heritage."

Rio and development partner BHP Group Ltd (BHP.AX) have sought for years to access the underground copper deposit, about 70 miles (113 km) east of Phoenix in the Tonto National Forest.

The U.S. Forest Service, which manages the land, declined to comment.

The deposit sits below land that belonged to the tribe before the United States existed. An 1852 treaty between U.S. officials and the tribe that is still in force set aside the land for the Apaches' use.

In 2014, the U.S. Congress and then-President Barack Obama approved a plan to let Rio exchange land it already owns for land above the copper, with the caveat that the swap could not occur until an environmental study was published. The outgoing Trump administration plans to publish that study on Friday, clearing the way for the exchange within 60 days. read more

Tribal members have also filed a lawsuit seeking to block the study's publication. read more

The lien is essentially a next line of defense if that lawsuit fails. Last year, the U.S. Supreme Court upheld 19th century land treaties between Washington and Oklahoma tribes, a precedent that could bolster the Apaches' lien request.

Rio has promised to seek the tribe's consent for the mine. Even if Rio were to gain control of the land, the company still needs federal permits, a process that both sides acknowledge could take years. read more

Reporting by Ernest Scheyder; Editing by Peter Cooney

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