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Mariana Minerals

Associate Metallurgical Engineer

San Francisco HQ$85k–$95kfulltimeentryAdded today

About this role

Mariana Minerals seeks an entry-level metallurgical engineer to support pilot-scale testing and process development for innovative mining technologies, including bioleaching columns. You'll operate equipment, design experiments, analyze data, and collaborate with R&D and software teams to advance critical mineral supply chain solutions.

What you'll do

  • Operate, troubleshoot, and optimize leaching columns and pilot-scale processing equipment
  • Design and execute pilot-scale experiments under senior engineer guidance
  • Develop process documentation including PFDs, P&IDs, procedures, and mass balances
  • Analyze experimental and operational data to identify process improvements
  • Support development of automated monitoring and optimization tools with software teams
  • Ensure safe operations through EHS compliance, hazard assessments, and change management

What they're looking for

  • Process development and pilot-scale experimentation
  • Leaching and metallurgical processing knowledge
  • Data analysis (Excel, Python, or MATLAB)
  • Technical documentation and process design
  • Problem-solving and troubleshooting
  • Health, safety, and environmental compliance
  • Cross-functional collaboration
  • Strong technical writing and communication
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Mariana Minerals

Mariana Minerals develops autonomous mining technology and critical minerals processing infrastructure, including software and hardware systems for self-operating vehicles and advanced refining facilities. The company is hiring Process Safety Engineers, Mechanical Engineers, Mechatronics Engineers (in both autonomy and hardware specializations), and Safety Specialists to build out their mining operations and safety programs.

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Likely interview questions

  • Walk us through a time you designed and executed an experiment—what was your approach, and how did you handle unexpected results?
  • How would you troubleshoot a leaching column that's not performing as expected? What data would you collect?
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