Senior Heavy Equipment Operator: Quarry & Plant

Martin Marietta; Guernsey (WY); On-site; USD 50,000 - 75,000; Full time

Job summary

Martin Marietta is seeking an Equipment Operator II to safely and efficiently operate heavy mobile equipment (loaders, excavators, dozers) to support extraction, transport, and processing of raw materials. This role goes beyond basic operation; the Operator II maintains site infrastructure, performs preventive maintenance, and troubleshoots malfunctions to maximize uptime.

Under moderate supervision, you will demonstrate advanced proficiency in material handling, ensure MSHA compliance, and

Qualifications

• High school diploma, GED, or relevant experience.
• 1+ years of heavy equipment experience in aggregate, construction, or mining.
• Technical training or vocational certification preferred.
• MSHA compliance knowledge.

Responsibilities

• Safely operate a variety of heavy equipment to transport raw materials from the pit to the plant at maximum loading capacity.
• Adjust equipment settings and operational techniques using SOPs to maximize throughput and minimize cycle times.
• Coordinate equipment positioning and sequencing to support site supervisors in optimizing production flows.
• Ensure all cargo is properly loaded according to safety requirements, preventing spills and maintaining vehicle stability.
• Strictly adhere to all MSHA safety rules, as well as Martin Marietta's Guardian Angel programs.
• Maintain the integrity of the quarry by ensuring haul roads, berms, and loading areas meet safety standards and site specifications.
• Facilitate and maintain safe traffic flow throughout the site, communicating via CB radio or hand signals to coordinate movement with co-workers and customer trucks.
• Proactively identify and report site hazards, such as unstable highwalls, loose material, or electrical risks.
• Conduct thorough daily inspections of vehicle systems, hydraulic lines, tires, and safety accessories, documenting findings in official logs.
• Perform daily preventative maintenance (PMs), including greasing moving parts and checking oil, diesel, and coolant levels.
• Use mechanical aptitude to diagnose equipment malfunctions and perform minor repairs; promptly report significant mechanical failures to the maintenance shop.
• Assist the maintenance team with plant repairs and clean-up, including the replacement of idlers, pulleys, and bearings during shutdowns.
• Aid in the training of co-workers and junior operators on safe operation techniques, site protocols, and equipment maintenance.
• Provide operational support across various areas of the plant.
• Maintain professional and effective communication with Plant Operators, Supervisors, and external customers to ensure a cohesive work environment.

Skills

Mechanical aptitude

Troubleshooting

Critical thinking

Safety focused

MSHA compliance

Regulatory compliance

Effective communication

Time management

Education

High school diploma or GED

Technical training or vocational certification preferred

Job description

Martin Marietta is seeking an Equipment Operator II to safely and efficiently operate heavy mobile equipment (loaders, excavators, dozers) to support extraction, transport, and processing of raw materials. This role goes beyond basic operation; the Operator II maintains site infrastructure, performs preventive maintenance, and troubleshoots malfunctions to maximize uptime.

Under moderate supervision, you will demonstrate advanced proficiency in material handling, ensure MSHA compliance, and