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Hydrometallurgical Process Engineer

Mariana Minerals
San Francisco, CA

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Job Details

Full-time
$100,000 - $175,000 a year

Qualifications

Industrial equipment design
Chemical process control design
Reactor vessels
Fabrication
Project engineering
Chemical Engineering
Laboratory filtration
Energy balances in chemical engineering
Procurement experience
Design of manufacturing processes
Industrial construction experience
Mechanical system commissioning projects
Mass balances in chemical engineering
Developing automated manufacturing processes
Engineering process optimization
Industrial equipment installation
Industrial equipment troubleshooting
Process modeling
Chemical separation processes
Chemical process equipment selection
Model deployment
Technology transfer (scale-up process)
Filtration
Design engineering
Chemical process equipment sizing
Mining or extraction
Scalability
System deployment
Commissioning phase involvement
Senior level

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 Hydrometallurgical Process Engineer to work on building the critical minerals supply chain to support the world’s energy transition.

As a Hydrometallurgical Process Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also supporting development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team.

What You’ll Do

Lead hydrometallurgical process equipment scopes from concept development and modeling validation through procurement, detailed engineering, fabrication, installation, commissioning, and ramp-up
Manage external technology licensors, equipment vendors, and engineering partners to deliver fully integrated and performant hydrometallurgical refining systems
Develop detailed heat and material balances for complex hydrometallurgical process trains, including leaching, solution purification, solvent extraction/ion exchange, precipitation, crystallization, and residue handling
Build hydraulic models and process flow diagrams/P&IDs for hydrometallurgical circuits, ensuring operability, reliability, and safety
Create first-principles models of chemical reactors and unit operations (e.g., leach reactors, autoclaves, SX settlers, IX columns, precipitation reactors, filtration systems) to validate scale-up and derisk commercial designs
Identify, evaluate, and implement engineering solutions to optimize extraction, purification, and recovery processes under varying chemistry, feedstock qualities, and operating conditions
Collaborate deeply with R&D, lab staff, pilot-plant engineers, and operations teams to translate bench-scale insights into robust and scalable hydrometallurgical flowsheets
Work closely with software and machine-learning teams to automate process-engineering workflows and develop advanced control, optimization, and digital-twin models for hydrometallurgical reactors and plants

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 hydrometallurgical 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 hydrometallurgical or chemical-process equipment
Experience with the following industries and/or production environments:
Hydrometallurgical 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: $100K - $175K

Apply Now

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About Mariana Minerals

The Role

What You’ll Do

What You’ll Bring

Our culture is built on three principles:

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