Mariana Minerals
Plant Supervisor
- Location
- San Francisco, CA, US
- Arrangement
- On-site
- Employment type
- Full-time
- Level
- Manager
- Posted
- 4 September 2026 (27 days ago)
Checked yesterdayApplications go to the employer, never to RoleSprint
About this role
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 Operations Supervisor to join our San Francisco Pilot Plant team. You will oversee a team of high performing technicians who support the design, deployment, and operation of first-of-its-kind refining processes for critical minerals, while also supporting development of software for automated plant optimization. This position is highly hands-on and will play a critical role in bridging R&D and Operations, ensuring processes are robust, safe, cost-effective, and suitable for commercial production.
WHAT YOU'LL DO
- Serve as the direct lead for a team of high performing operations technicians
- Help drive performance reviews, scheduling, training, and hiring
- Collaborate with engineers, R&D scientists, and the technicians to operate and monitor mineral extraction chemical processes
- Provide off-hours support on evenings and weekends to plant upsets and high priority projects
- Create and sustain EHS programs and policies regarding chemical handling, hazard assessment, high risk activities, PPE and waste management compliance
- Ensure high-quality data capture from the plant via sampling, basic laboratory measurements, instrument uptime, and MarianaOS usage
- Own plant cleanliness and organization, ensuring work areas, tools, and equipment are well-maintained and ready for operations
- Create and maintain procedures, experimental records, shift reports, and other critical operations documents
DESIRED QUALIFICATIONS
- 2+ years of experience in a supervisory or lead role
- 5+ years of experience operating pilot plant or commercial scale industrial equipment in the minerals processing, chemicals, specialty materials, oil & gas, biotech, or similar industry
- Demonstrated leadership in core plant safety work processes such as Lockout/Tagout (LOTO), hot work permitting, confined space entry, and safe work permitting systems
- Experience using human–machine interfaces (HMIs) and plant software systems to monitor, control, and adjust process operation
- Experience overseeing hands-on equipment installation, modification, and troubleshooting
- Knowledge of basic process chemistry (pH, reaction stoichiometry, etc)
- Experience using engineering documents such as PFDs, control narratives, and P&IDs
- Excellent written and verbal communication skills
- 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!
Work location
- San Francisco, CA, US
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About this listing
Advertised by Marianaminerals and published on Ashby, the applicant tracking system they use.
RoleSprint is not the employer and not a recruiter. Applications are made on the employer’s own site and never reach us; what RoleSprint does is help you decide whether a role is worth your time and prepare for it if it is.
Published 4 September 2026, last checked yesterday. A posting stops being advertised here 90 days after the employer published it, and one the employer takes down is marked closed rather than quietly removed.