Allow data modeling for mine bond release

This bill amends Montana's mining regulations to allow mine operators to use predictive data modeling as part of their application to release performance bonds for reclaimed mine sites. The change permits operators to include modeling alongside traditional monitoring data to demonstrate that their reclamation work meets approved plans, potentially streamlining the bond release process. It requires operators to notify neighboring property owners and local agencies of their intent to seek bond release and mandates that the state department establish rules for how modeling and other evidence are evaluated. The bill also clarifies existing requirements for backfilling, grading, and soil management in strip and underground coal mining operations.