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 Role
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.
What You'll Do
- Drive the fabrication, installation, modification, startup, and commissioning of new equipment and pilot plant systems in San Francisco and other sites across the US
- Troubleshoot and repair mechanical issues on plant equipment including pumps, valves, piping systems, filtration units, and other process equipment.
- Read and interpret engineering drawings, P&IDs, and equipment manuals to support maintenance and installation work.
- Safely perform maintenance activities following plant safety procedures including Lockout/Tagout (LOTO), hot work permitting, and confined space entry.
- Utilize MarianaOS CMMS system to document equipment builds and troubleshooting
Desired Qualifications
- 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.
- 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!