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Jobs at Mariana Minerals
96 open roles read nightly from companies’ own hiring pages. Each one links to the original ad.
1–20 of 96 jobs
Maintenance Technician, Electrical
YesterdayMariana Minerals · Joaquin, Texas, United States
On-siteFull-timeMid levelTrades & logisticsInstall, maintain, repair, and test electrical, control, communication, and measurement equipment, including medium and low voltage motors, switchgear, breakers, and motor control centers; Troubleshoot and diagnose issues with PLCs, relay systems, and instrumentation across the…
Workplace Manager
7 days agoMariana Minerals · Houston, Texas, United States
On-siteFull-timeMid levelWe are hiring a Workplace Manager to own the day-to-day operations of our Houston office, be a resource for our Houston pilot plant, and remotely support our Ann Arbor satellite office as needed. You will create an engaging, welcoming, safe, and well-run on-site environment…
Stacking/Sizer Operator
8 days agoMariana Minerals · Moab, Utah, United States
On-siteFull-timeTrades & logisticsThe Equipment Operator plays a critical operational role in supporting mine production through the safe and efficient operation of heavy equipment, including stackers and sizers.
R&D Technician
8 days agoMariana Minerals · San Francisco, California, United States
On-siteFull-time$40.00 – $47.00 an hourTrades & logisticsThe R&D Technician executes designed experiments and operates chemical processing equipment to advance Mariana Minerals' hydrometallurgical and purification technologies. This hands-on role focuses on running DOE protocols, operating tank reactors and purification systems, and…
Analytical Lab Chemist
9 days agoMariana Minerals · San Francisco, California, United States
On-siteFull-time$110K – $130K a yearScience & researchSafety & Compliance: Strictly adhere to all SOPs, chemical hygiene plans, and PPE requirements to maintain a safe working environment.; Lab Maintenance: willing to maintain a clean and organized workspace; manage chemical inventory and waste disposal according to regulatory…
Mobile Maintenance Supervisor
9 days agoMariana Minerals · Moab, Utah, United States
On-siteFull-timeManagerEngineeringLead, supervise, and develop a team of maintenance technicians while maintaining a safety-first mentality and a strong culture of accountability, teamwork, and continuous improvement.; Conduct safety meetings and workplace inspections, address hazards, and ensure work is…
Administrative Assistant
10 days agoMariana Minerals · Houston, Texas, United States
On-siteFull-timeEntry levelAdministrationThe Administrative Assistant will provide administrative / executive support to the CFO, including calendar and travel coordination and expense management, while also supporting day-to-day office operations. The role will also serve as backup to the Executive Assistant as…
Senior/Staff Chemical Process Engineer
11 days agoMariana Minerals · San Francisco, California, United States
On-siteFull-timeLead / staff$140K – $175K a yearEngineeringMariana Minerals is looking for a highly motivated Sr./Staff Process Engineer to work on building the critical minerals supply chain to support the world’s energy transition and to supply metals necessary for technology and AI, energy, mobility, and defense.
Process Engineer
11 days agoMariana Minerals · Moab, Utah, United States
On-siteFull-timeMid levelEngineeringAct as the engineering owner of the SX and EW circuits, including mixer-settlers, organic and electrolyte handling, tank house, cell house and associated utilities.; Monitor daily plant performance (PLS grade and flow, extraction and stripping efficiency, phase continuity,…
Controls Technician
11 days agoMariana Minerals · Joaquin, Texas, United States
On-siteFull-timeMid levelTrades & logisticsTroubleshoot and diagnose electrical and controls issues across industrial equipment and processes, using system knowledge and the right instruments for the voltages and currents involved; Install, test, and maintain electrical equipment, including motor control centers,…
Associate, Corporate Development
2 weeks agoMariana Minerals · Houston, Texas, United States
On-siteFull-timeEntry levelFinanceBuild and maintain financial models: project-level DCFs, life-of-mine models, financing structures, returns and sensitivity analysis, and corporate funding plans.; Prepare investor presentations, lender materials, board materials, and internal decision memos.; Run diligence…
Manager, Corporate Development
2 weeks agoMariana Minerals · Houston, Texas, United States
On-siteFull-timeManagerFinanceLead individual financing and M&A workstreams from origination through close, including process design, timeline, and counterparty management.; Negotiate commercial and financing terms directly with investors, lenders, strategics, and trading houses, working alongside legal and…
Process Maintenance Technician
2 weeks agoMariana Minerals · Moab, Utah, United States
On-siteFull-timeMid levelTrades & logisticsDiagnose, install, and repair fixed plant equipment, including pumps, compressors, boilers, fans, motors, gearboxes, piping, valves, and automated valves, identifying root causes.; Maintain site buildings and infrastructure, including truck shops, admin buildings, and plumbing…
Mariana Minerals · Moab, Utah, United States
On-siteFull-timeTrades & logisticsMariana 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…
Staff Mechanical Engineer
2 weeks agoMariana Minerals · Houston, Texas, United States
On-siteFull-timeLead / staff$140K – $190K a yearEngineeringMariana Minerals is seeking a highly motivated Staff Mechanical Engineer to support our next-generation minerals processing pilot plant in Houston. You will lead the design, integration, and deployment of pilot-scale mechanical systems and processing equipment used to…
Staff Process Modeling Engineer
2 weeks agoMariana Minerals · Houston, Texas, United States
On-siteFull-timeLead / staff$100K – $160K a yearEngineeringMariana Minerals is seeking a highly motivated Staff Process Modeling Engineer to support the development of next-generation refining processes for critical minerals — key to enabling the world’s energy transition.
Procurement Manager, Mobile Equipment
2 weeks agoMariana Minerals · San Francisco, California, United States
On-siteFull-timeManager$130K – $190K a yearEngineeringMariana is hiring a Procurement Manager, Mobile Equipment to own the sourcing, contracting, and lifecycle management of mobile and heavy equipment across our operating sites and projects, including haul trucks, excavators, loaders, fleet vehicles, and forklifts.
Commercial Manager, Energy & Utilities
2 weeks agoMariana Minerals · San Francisco, California, United States
On-siteFull-timeManager$130K – $190K a yearSalesMariana is hiring a Commercial Manager, Energy & Utilities to own electricity, water, and natural gas agreements across our operating sites and sites in development. This is a commercial role — you will take load requirements and operating plans from engineering and operations…
Sr. Cost Control Engineer
2 weeks agoMariana Minerals · Houston, Texas, United States +1
On-siteFull-timeSenior$140K – $180K a yearEngineeringWe are hiring a Cost Control Engineer to own the cost baseline, the forecast, and change control on Mariana's capital projects.
Mariana Minerals · Houston, Texas, United States
On-siteFull-timeEngineeringAs a Construction & Commissioning Quality Engineer, you will lead site quality across all of Mariana Minerals’ industrial process facilities, from construction and installation through testing, commissioning, handover, and project closeout. You’ll make sure quality requirements…
Updated 06 Nov 2026 09:37 UTC from the OptiTalent job library.