Creates rules for locating and using hardrock mining “mill sites” on public land and establishes an "Abandoned Hardrock Mine Fund" in the U.S. Treasury to receive certain claim-fee payments. The bill defines key terms, limits the size and number of mill sites (for example, a single mill site may not exceed 5 acres), allows claimants to include necessary mill sites in approved plans of operations, preserves existing federal regulatory authority and claimant rights, and specifies how Fund amounts may be used and allocated to support work under the Infrastructure Investment and Jobs Act.