About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.

Position Summary

The Mine Maintenance Supervisor is a safety-focused leader responsible for overseeing a team of technicians and ensuring the efficient operation of mine equipment. This role requires strong technical and problem-solving skills to diagnose and repair equipment, as well as excellent communication and organizational abilities to manage work orders, parts, and projects. The Mine Maintenance Supervisor will foster a positive work environment, prioritize safety, and collaborate effectively with other departments to maximize productivity and minimize downtime.

Essential Duties and Responsibilities:

Safety and Compliance:

• Conduct daily safety meetings and workplace inspections to ensure a safe work environment.

• Manage and maintain technician daily logs, incident/accident reports, and investigation documentation.

• Ensure compliance with all relevant safety regulations and company policies.

Crew Management:

• Complete timecards for crew in an accurate and timely manner.

• Supervise and lead a team of maintenance technicians.

• Assign tasks and prioritize workload to ensure efficient completion of maintenance activities.

• Foster a positive and collaborative team environment.

• Provide guidance, mentorship, and training to develop technician skills and knowledge.

• Promote and maintain a clean, organized, and safe work area.

Workload Management:

• Effectively manage time and resources to meet deadlines and production targets.

• Prioritize maintenance tasks based on urgency and impact on operations.

• Plan and organize projects, including coordinating tooling, parts, and personnel.

Work Order Management:

• Create, review, and complete work orders accurately and efficiently.

• Communicate effectively with planners to ensure proper scheduling and resource allocation.

Parts Management:

• Create, review, and manage parts lists for maintenance activities.

• Communicate with vendors to source and procure necessary parts.

• Research and identify suitable replacement parts and gather technical information.

Equipment Repair:

• Perform hands-on, in-the-field repairs and troubleshooting alongside the maintenance team as needed to support operational needs.

• Research technical information and parts requirements for repairs.

• Advise planners on necessary repairs and estimated downtime.

• Manage equipment availability and reporting to optimize operational efficiency.

• Collaborate with other departments to ensure timely and effective equipment repair.

Required Qualifications:

• Experience managing a team in mobile or vehicle maintenance, preferably in a mine setting.

• Exceptional communication, interpersonal, and coordination skills are essential for success in this role.

• Proficient in Microsoft Office Suite, especially Excel and Outlook.

• The ideal candidate will possess proficiency in various welding techniques and demonstrate safe handling of related equipment.

• A comprehensive understanding of vehicle systems, including hydraulics, electrical, filtration, fuel, A/C and refrigeration, is crucial, along with the ability to troubleshoot, repair, and perform preventative maintenance on them.

• Ability to perform advanced troubleshooting and failure analysis, utilizing electronic diagnostic tools and interpreting maintenance manuals and schematics.

• Knowledge and skill in maintaining various pumps, compressors, boilers, and other plant equipment.

• The ability to work rotating shifts is necessary, with the understanding that the shift schedule may change as needed.

• Be willing and able to perform manual labor tasks as required.

• Be proficient in the use of maintenance tracking software.

• Be able to read and understand Material Safety Data Sheets (MSDS).

• Possess a valid driver's license.

• Must be able to work extended hours, overtime, and be available for on-call status.

Our culture is built on three principles:

Extreme Ownership – We take full responsibility for outcomes, relentlessly driving toward solutions.

Engineer Out Requirements, then Automate – We simplify, optimize, and then automate for scale.

Share Your Legos – We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.

Join us as we build the future of responsible mineral sourcing and supply.