Hydro Metallurgical Process Engineer

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.

Requirements

• 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