Big Timber, MT 59011 • (36 miles) • Full Time • $39.56 to $42.91 / hr • 9/24/2026

Millwright 1 or 2 - Concentrator Location: East Boulder Mine - McLeod, MT Schedule: 5x4x4x5 - Straight Days 7:00am-6:30pm (11.5 hour shifts) Job Responsibilities and Duties: Responsible for performing preventative maintenance and repairs of Ball Mills and SAG Mills, gear boxes, centrifugal and vertical turbine pumps, vibrating screens, jaw crushers, cone crushers and conveyor systems. Perform a variety of building maintenance tasks. Able to work without direct supervision. Maintain cleanliness of work areas. Other tasks as assigned. Qualifications and Skills: Required: Millwright or similar background with welding and mechanical experience. Housekeeping standards maintained to high level. Basic knowledge of mechanics, hydraulic and pneumatic systems. General blueprint knowledge. Ability to

Big Timber, MT 59011 • (36 miles) • Full Time • $32.21 to $37.33 / hr • 9/24/2026

Sand Plant Operator 1 or 2 Location: East Boulder Mine - EB Schedule: Rotating - 5x4x4x5 Job Responsibilities and Duties: Operates underground backfill plants. Operates high- pressure slurry pumping systems. Monitors the slurry silo filling. Coordinates intake and output from silos. Monitors the slurry intake and output to the Geho back fill pumps at the sand plants as required. Draw density samples and record pertinent data related to back fill operations. Perform routine maintenance and troubleshoot breakdowns. Maintain operational records on a shift-by-shift basis. Perform other duties as assigned from time to time at the discretion of the company. Qualifications and Skills: Stationary equipment operations and maintenance background. Piping and valve installation/maintenance. Monitor sl

Big Timber, MT 59011 • (36 miles) • Full Time • 9/21/2026

Maintenance Planner Location: East Boulder - McLeod, MT Schedule: 5x2, 4x3 - 9-hour days Job Responsibilities and Duties: The Mobile Maintenance Planner defines priorities for criticality of equipment and ensures that reliability centered maintenance tactics are reflected in the maintenance plans. The planner incorporates asset strategies and enhance planning processes to improve workplace safety, service quality and data accuracy. The planning activities contribute to establishing a work environment committed to excellence, by ensuring that labor needs are effectively balanced. This role requires substantial coordination with others. The Mobile Maintenance Planner works closely with the maintenance general foreman and supervisors regarding work priorities and to ensure that work packages

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