Process Maintenance Technician

About Mariana Minerals & Copper One

Mariana Minerals is a growing natural resources company focused on developing and operating long-life copper assets in stable jurisdictions. Through its Copper One platform, Mariana Minerals owns and operates the Lisbon Valley Mining Company, a producing open-pit copper mine and associated process facilities located in southeastern Utah.

Lisbon Valley Mining Company is committed to safe, reliable, and efficient mining and processing operations. Our process maintenance team plays a vital role in maintaining plant availability, controlling operational risk, and supporting continuous improvement across the site.

Position Summary

The Process Maintenance Technician is responsible for maintaining, installing, troubleshooting, and repairing fixed plant equipment and process systems to ensure safe, efficient, and reliable operation of the processing facilities. This role supports production by minimizing downtime, maintaining equipment integrity, and ensuring compliance with safety and regulatory requirements.

The ideal candidate is safety-focused, mechanically skilled, and experienced in maintaining industrial or mining process equipment in a fast-paced, safety-sensitive environment.

Key Responsibilities

• Perform diagnostics, maintenance, installation, and repair of fixed plant equipment and associated systems, including pumps, compressors, boilers, fans, and valves.

• Conduct preventive maintenance activities such as filter changes, seal inspections, oil level checks, lubrication servicing, and routine equipment adjustments.

• Perform welding and fabrication tasks as required to support maintenance and repair activities.

• Operate mobile and material-handling equipment, including forklifts, overhead cranes, and boom trucks, in accordance with safety procedures.

• Maintain plant equipment in compliance with MSHA regulations and other applicable regulatory and company standards.

• Perform maintenance and repairs on other mine facilities, including EW systems, infrastructure, and office buildings as needed.

• Follow all safety policies, procedures, and PPE requirements while performing work.

• Complete accurate and timely documentation in maintenance logs, work orders, and service records.

Required Qualifications & Experience

• Prior experience in fixed plant or process maintenance, preferably in mining, industrial, or heavy manufacturing environments.

• Strong ability to communicate and coordinate maintenance activities with operations, engineering, and other support departments.

• Ownership and proper maintenance of required technician-level tools.

• Working knowledge of pump, motor, and gearbox installation, repair, and rebuild.

• Experience with compressor teardown and rebuild activities.

• Understanding of hydraulic system fundamentals and basic troubleshooting.

• Ability to perform lubrication services and preventive maintenance on light-duty vehicles.

• Familiarity with oil sampling procedures and basic vehicle system diagnostics.

• Ability to read and interpret maintenance service manuals, parts manuals, and technical documentation.

• Organized, detail-oriented, and takes pride in high-quality workmanship.

Physical Requirements

• Ability to walk long distances over rough, uneven terrain and climb ladders and structures.

• Ability to lift a minimum of 50 pounds.

• Ability to work in all weather conditions, including extreme temperatures.

• Must wear and properly use required PPE, including hard hat, steel-toed footwear, safety glasses, high-visibility vest, hearing protection, respirator (as required), and protective clothing.

• Ability to work in environments with potential exposure to dust, fumes, diesel exhaust, solvents, sulphuric acid, and other hazardous materials.

Equal Employment Opportunity Statement

Lisbon Valley Mining Company, a Copper One company and wholly owned subsidiary of Mariana Minerals, is an Equal Opportunity Employer. We provide equal employment opportunities to all employees and applicants without regard to race, color, religion, sex, sexual orientation, gender identity or expression, age, national origin, ancestry, disability, veteran status, genetic information, or any other characteristic protected by applicable law.

Lisbon Valley Mining Company (a Copper One and Mariana Minerals company) is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to protected characteristics under applicable law.

Lisbon Valley Mining Company is a safety-sensitive, drug-free workplace. Employment is contingent upon successful completion of pre-employment screening requirements in accordance with applicable law.