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Sr. Pyrometallurgical Process Engineer

Mariana Minerals
San Francisco, CA

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Job Details

Full-time
$130,000 - $160,000 a year

Qualifications

Industrial equipment design
Material handling systems
Chemical process control design
Developing energy-efficient facility solutions
Industrial automation
Project engineering
Chemical Engineering
Drying (manufacturing process)
Energy balances in chemical engineering
Requirements design
Procurement phase involvement
Industrial ovens
Mechanical system commissioning projects
Mass balances in chemical engineering
Petroleum and natural gas processing
Process design
Engineering process optimization
Simulation modeling (chemistry)
Industrial equipment installation
Industrial equipment troubleshooting
Chemical separation processes
Chemical process equipment selection
Continuous improvement
Technology transfer (scale-up process)
Filtration
Design engineering
Chemical process equipment sizing
Mining or extraction
Scalability
Construction experience

Full Job 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 Pyrometallurgical Process Engineer to help build the critical minerals supply chain supporting the world’s energy transition.

As a Pyrometallurgical Process Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind high-temperature refining and thermal processing systems. You will play a central role in designing, modeling, scaling, and commissioning pyrometallurgical unit operations, while supporting development of software tools for capital project execution and automated plant optimization.

Responsibilities include leading equipment and process scopes from concept and modeling validation through detailed engineering, installation, commissioning, ramp-up, and handover to operations.

What You’ll Do

Lead pyrometallurgical process scopes from early concept development and thermodynamic modeling through procurement, detailed engineering, fabrication, installation, commissioning, and ramp-up
Develop detailed heat and material balances for high-temperature process trains, including drying, calcination, roasting, reduction, smelting, converting, slag cleaning, refining, and off-gas treatment
Design and validate thermal process flowsheets and PFDs/P&IDs for pyrometallurgical circuits, ensuring safety, reliability, and scalability
Build first-principles thermodynamic and kinetic models for high-temperature reactors and furnaces (e.g., rotary kilns, calciners, electric arc furnaces, submerged arc furnaces, reverberatory furnaces, flash smelters) to support scale-up and commercial deployment
Model and optimize phase equilibria, slag chemistry, metal recovery, refractory performance, and energy efficiency
Define specifications and operating envelopes for high-temperature process equipment, burners, power systems, refractory linings, and gas-handling systems
Identify, evaluate, and implement process improvements to maximize metal recovery, minimize energy consumption, control emissions, and ensure stable furnace operation under varying feedstock chemistries
Collaborate closely with R&D, lab teams, and pilot-plant engineers to translate bench- and pilot-scale findings into robust commercial pyrometallurgical designs
Work with environmental and controls teams to design and optimize off-gas handling systems (e.g., cyclones, baghouses, scrubbers, thermal oxidizers, heat-recovery systems)
Partner with software and machine-learning teams to automate process-engineering workflows and develop advanced control, optimization, and digital-twin models for high-temperature reactors and furnaces

What You'll Bring

Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems
Strong foundation in chemical engineering, metallurgical engineering, or process engineering, with demonstrated ability to apply engineering fundamentals to complex pyrometallurgical systems
Experience with equipment engineering and design. Including but not limited to:
Brownfield modifications and upgrades of process equipment (e.g., leach tanks, reactors, filtration systems, solvent extraction circuits)
Greenfield design of hydrometallurgical unit operations and integrated circuits
Troubleshooting, evaluation, and optimization of operating pyrometallurgical or chemical-process equipment
Experience with the following industries and/or production environments:
Pyrometallurgical mineral processing or metal refining
Large-scale mining, critical-minerals processing, or battery-materials production
Industrial chemical manufacturing with complex aqueous/chemical reaction systems
Engineering, procurement, and construction (EPC/EPCM) firms supporting mining and mineral processing industry projects

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.

Compensation Range: $130K - $160K

Apply Now

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The Role

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What You'll Bring

Our culture is built on three principles:

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