MT SB520

Mining leases for metalliferous minerals, gems, and nonmetallic minerals on state lands must have a primary term of not less than 10 years and continue as long as minerals are produced in commercial quantities

Lease terms must be extended if the lease or related permits are delayed by court injunctions, restraining orders, or agency review challenges

Leases cannot be terminated at the end of the primary term if lands are covered by an active mining permit or mine-site location permit under Title 82, chapter 4

Department must withhold proprietary geological information from public inspection for at least 5 years after lease expiration to protect lessees' economic interests

For nonmetallic mineral leases facing termination due to nonproduction, lessees may pay a nonproduction royalty to extend the primary term for an additional 5 years