Associate Metallurgical Engineer

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.

ROLE OVERVIEW

Mariana Minerals is seeking a highly motivated Associate Metallurgical Engineer to support process development activities and pilot-scale testing for our CopperOne mine pilot facility in San Francisco. You will work alongside experienced engineers and technicians supporting our bioleaching columns and other pilot-scale equipment used to develop new mining technologies. This is a hands-on, entry-level role where you will help transition technologies from laboratory research to pilot testing and ultimately commercial mining. You will work closely with R&D, technicians, metallurgists, and cross-functional teams to learn, contribute, and help improve our processes.

WHAT YOU’LL DO

- Operate, troubleshoot, and improve leaching columns and other pilot-scale processing equipment in collaboration with technicians

- Design and execute pilot-scale experiments with guidance from senior engineers

- Develop and maintain key process documentation including PFDs, P&IDs, operating procedures, and mass balances

- Analyze experimental and operational data to help identify opportunities for process improvement

- Support development of automated monitoring and optimization tools in collaboration with software and machine learning teams

- Support safe operations by following EHS procedures and assisting with hazard assessments, risk management, and management of change processes

WHAT YOU’LL BRING

- B.S. or M.S. in Chemical Engineering, Mining Engineering, Metallurgy, or a related field

- 0–2 years of relevant experience through internships, research, co-ops, or full-time work

- Strong problem-solving skills and an interest in experimental process development

- Experience analyzing data using Excel, Python, MATLAB, or similar tools is a plus

- Strong commitment to Health, Safety, and Environmental compliance

- Excellent technical writing, communication, and teamwork skills

- Comfortable working in a fast-paced environment, learning new skills, and collaborating across teams

OUR CULTURE IS BUILT ON THREE PRINCIPLES:

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.

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