Maintenance Technician, Mechanical

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. The Maintenance Technician, Mechanical supports safe, reliable operation of our process and utility equipment at Lithium One in Joaquin, TX. In this role, you will perform preventive and corrective maintenance on pumps, motors, valves, conveyors, blowers, compressors, and other rotating equipment, then respond to unplanned breakdowns and trace problems to the root cause. You will play a critical role in keeping production steady and downtime low, and you will have a real hand in building our maintenance program from the ground up, including finding ways to simplify or automate repetitive maintenance tasks. As a startup, the first 6-8 months will include work beyond your mechanical specialty, such as electrical and instrumentation support, so the ideal fit is someone who loves variety and wants to build something. Responsibilities

• Perform preventive, predictive, and corrective maintenance on pumps, motors, valves, conveyors, blowers, compressors, and other rotating and process equipment
• Troubleshoot and diagnose planned and unplanned equipment issues across the Lithium One plant, finding the root cause and making timely repairs
• Keep production steady by minimizing downtime and completing work to manufacturer specifications and quality standards
• Perform and document accurate inspections, calibration, and lubrication on process and utility equipment, and recommend equipment for inclusion in preventive maintenance programs
• Read P&IDs, schematics, and blueprints, requisition parts and materials, and log work, parts used, and equipment condition in our in-house CMMS
• Work with operations, engineering, and the electrical and controls techs to support start-up, shutdown, and change-out activities, and communicate potential hazards to engineers, electricians, and operators
• Follow all OSHA and company safety procedures (including lockout/tagout, confined space, and traffic rules), actively participate in safety meetings, and immediately report hazards, near misses, or equipment damage while ensuring operations meet environmental and regulatory standards Qualifications & Experience
• Technical or trade school training in industrial maintenance or mechanical technology preferred (or equivalent experience)
• Proven industrial maintenance experience, 3+ years
• Hands-on experience with piping and with pump, motor, and valve rebuild and repair on rotating and process equipment
• Experience in an oil & gas, water treatment, chemical processing, or similar industrial setting (oil & gas highly preferred; hydrometallurgy, mining, or battery materials experience is a plus)
• Working knowledge of electrical and basic instrumentation systems, including motor starters and control circuits
• Ability to read P&IDs, schematics, blueprints, and equipment manuals
• Strong mechanical aptitude, with comfort using hand tools, power tools, precision measuring instruments, and basic rigging
• Strong communication across shifts and good computer skills; CMMS experience preferred
• Valid driver's license Schedule 12-hour shifts (6am-6pm): Sunday-Tuesday plus every other Wednesday, or Thursday-Saturday plus every other Wednesday. A night rotation will be added in the near future. Working Environment & Physical Requirements
• Work in the processing plant and shop, in all weather conditions including extreme temperatures, with exposure to chemicals and other hazardous materials
• Ability to lift a minimum of 50 pounds and to stand, walk, and work in confined or elevated spaces for extended periods
• Ability to climb ladders and structures, with the manual dexterity to use hand and power tools
• Must wear and use all required PPE OUR CULTURE IS BUILT ON FOUR PRINCIPLES: Everyone Gets Home Safe. We never put speed or cost ahead of people. 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!