Big Timber, MT 59011 • (36 miles) • Full Time • $106,000 / yr • 10/23/2026

Supervisor - Mine Support - UG Backfill & Construction Location: East Boulder - McLeod, MT Schedule: 7X7 Rotating Job Responsibilities and Duties: The Supervisor - Underground Backfill & Construction leads the safe, efficient, and compliant execution of underground backfill and mine-infrastructure construction. Reporting to the General Foreman, this position converts the weekly plan into resource-ready shift work. The position directs backfill placement, barricade and bulkhead work, concrete, shotcrete, piping, pumping, excavation, fabrication, and underground service installations. They coordinate with Operations, Maintenance, Technical Services, and contractors to support the overall execution of mine objectives. The Supervisor verifies work readiness and quality, manages variance within

Big Timber, MT 59011 • (36 miles) • Full Time • $101,000 / yr • 9/26/2026

Supervisor - Mine Development Location: East Boulder Mine - McLeod, MT Schedule: 5x4, 4x5 11.5hr Shifts Job Responsibilities and Duties: The Supervisor provides frontline leadership for the safe, efficient, and compliant execution of underground mining operations. Reporting to the General Foreman, this position translates the approved weekly plan into resource-ready shift execution, directs and verifies work in the field, holds crews accountable for performance, manages operational variance within delegated authority, and escalates constraints or changes that may affect committed work. The Supervisor coordinates with crews, peers, management, Maintenance, Technical Services, Safety, Training, Human Resources, and other support functions to maintain safe and reliable operations and achieve