The American Minerals Royalty and Investment Act of 2026 establishes a new federal fund to collect and distribute royalties from hardrock mining operations, directing revenues to states where minerals are extracted, Indian Tribes, infrastructure programs, and environmental restoration efforts, with states required to spend at least half their share on mining-related environmental mitigation. The bill also creates a $50 million per-project grant program to help companies build or expand U.S. facilities for processing critical minerals, with applicants required to demonstrate financial viability, commit to worker training, secure environmental protections, and coordinate with Indian Tribes on impact mitigation. The legislation requires federal agencies including the Departments of Defense, Energy, and Commerce to coordinate implementation, mandates Congressional notification for grants over $10 million, and establishes biennial Government Accountability Office reviews over a ten-year period to assess fund distribution, project performance, and environmental impacts on Tribal and nearby communities. The law defines key terms related to mining activities, critical minerals, foreign entity restrictions, and federal oversight authority.