Maintenance Technician – Electrical & Controls

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 (Electrical & Controls) keeps the electrical, controls, and instrumentation systems at Lithium One, our East Texas refinery in Joaquin, TX, running safely and reliably. You’ll install, test, and maintain motors, switchgear, transformers, and motor control centers, and when something goes down, you’ll be the one troubleshooting the PLCs, VFDs, relays, and instrumentation to get production back up. Because we’re a startup, you’ll also have a real hand in building our maintenance program from the ground up, from PM planning and CMMS to finding ways to simplify or automate repetitive work. Responsibilities - Install, maintain, repair, and test electrical and controls equipment, including medium and low voltage motors, 480V three-phase and single-phase circuits, transformers, switchgear, breakers, generators, load centers, and motor control centers - Troubleshoot and diagnose issues with PLCs, VFDs, HMIs, relay systems, instrumentation, and industrial networks during both planned maintenance and unplanned breakdowns, find the root cause, and make timely repairs - Maintain, program, and upgrade control systems, including Allen Bradley PLCs, and own controls projects from start to finish - Perform and document preventive maintenance, inspections, and calibration on electrical, controls, and instrumentation equipment, and recommend equipment for inclusion in PM programs - Read one-line diagrams, blueprints, and schematics, calculate circuit load requirements, and log work, parts used, and asset history accurately in our in-house CMMS - Work closely with operations, engineering, mechanics, and the maintenance crew; support pump, motor, valve, and piping repairs; flag potential hazards; and suggest improvements to planning, scheduling, PM, and storeroom processes - Follow all OSHA and company safety procedures (including lockout/tagout, confined space, and traffic rules) and local, state, and national electrical codes; participate in safety meetings and report hazards, near misses, or equipment damage right away Qualifications & Experience - 3+ years of industrial or manufacturing maintenance experience with a focus on electrical and controls - Associate’s degree in electrical, electronics, or instrumentation preferred, or equivalent experience - Hands-on experience with 480V three-phase and single-phase AC circuits, motors, transformers, switchgear, breakers, MCCs, relay systems, and instrumentation, plus solid knowledge of electrical power and distribution systems - Ability to read one-line diagrams, blueprints, schematics, and manufacturer specs, and to calculate circuit load requirements - Well-rounded mechanical aptitude, including hydraulics, pneumatics, pumps, valves, and piping - Skilled with hand and power tools and electrical test and measurement equipment - Able to walk through how you approach planned vs. unplanned maintenance, including how you troubleshoot when equipment fails unexpectedly - Experience in oil & gas, water treatment, chemical processing, or a similar industrial setting; hydrometallurgy, mining, or battery materials experience is a plus - Strong communication across shifts and good computer skills; CMMS experience preferred - Valid driver’s license Schedule - 12-hour shifts, 6 AM–6 PM - Sunday–Tuesday plus every other Wednesday, or Thursday–Saturday plus every other Wednesday - A night shift option will be added in Spring 2027 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!