Fabrication Technician

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.

Mariana Minerals is looking for a highly motivated Fabrication Technician to join our San Francisco Pilot Plant team. You will support the design, installation, and maintenance of first-of-its-kind refining processes for critical minerals. As part of a growing maintenance team, you’ll help build out our fabrication capabilities, getting creative with the resources we have and adapting to the unique demands of R&D builds. This position plays a critical role in bridging R&D and Operations, ensuring our equipment and work processes are robust, safe, cost-effective, and suitable for commercial production.

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  Drive the fabrication, installation, modification, startup, and commissioning of new equipment and pilot plant systems in San Francisco and other sites across the US

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  Troubleshoot and repair mechanical issues on plant equipment including pumps, valves, piping systems, filtration units, and other process equipment.

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  Read and interpret engineering drawings, P&IDs, and equipment manuals to support maintenance and installation work.

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  Safely perform maintenance activities following plant safety procedures including Lockout/Tagout (LOTO), hot work permitting, and confined space entry.

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  Utilize MarianaOS CMMS system to document equipment builds and troubleshooting

• Associate degree, technical certificate, or equivalent hands-on experience in industrial fabrication, mechanical technology, millwright work, or related field.

• 3+ years of experience building or supporting industrial equipment in the minerals processing, chemicals, specialty materials, oil & gas, biotech, or similar industries.

• Hands-on experience fabricating, modifying, and/or constructing industrial equipment

• Hands-on experience with troubleshooting tasks such as pump repair, valve replacement, and instrument troubleshooting

• Familiarity with core plant safety practices including Lockout/Tagout (LOTO), hot work permits, confined space entry, and safe work permitting systems.

• Ability to read and interpret engineering drawings such as P&IDs, equipment diagrams, and mechanical layouts.

• Ability to travel occasionally (10-25%) of the time to other Mariana sites to support fabrication activities

• Ability to climb stairs, stand for extended periods of time, and safely lift up to 50 lbs.