About the 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