# Fabrication Technician at Mariana Minerals

Fabrication Technician at Mariana Minerals in San Francisco HQ. On-site, full-time, paying $45–$55/hr. Posted October 20, 2026.

- Company: Mariana Minerals
- Location: San Francisco HQ
- Workplace: On-site
- Job type: Full-time
- Pay: $45–$55/hr
- Experience: 3+ years
- Posted: 2026-10-20
- Apply: https://jobs.ashbyhq.com/marianaminerals/0c1ee5fe-ac09-44f4-be12-f5968de0399d/application
- Source: https://jobmagic.ai/jobs/fabrication-technician-mariana-minerals-g4j163

## Requirements

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

## Description

**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!**