Marianaminerals
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 how minerals are sourced, refined, and optimized by combining deep industrial expertise with
software, automation, and data-driven decision-making . Join us as we build the future of responsible mineral sourcing and supply.
Role Overview Mariana Minerals is looking for a highly motivated Lead Process Engineer to work on building the critical minerals supply chain to support the world’s energy transition.
As the Lead Process Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the 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, identifying and evaluating new project opportunities for North American mineral refining, and supporting the buildout and leading an in-house process engineering team.
What You’ll Do Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp
Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes
Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes
Support the hiring, mentorship, and day-to-day management of junior process engineers
Develop technoeconomic models of new project opportunities, acquisition targets, and new technologies to inform business development
Prepare and present bankable engineering deliverables to support project financing partners due diligence reviews
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 flowsheets
Identify, evaluate, and implement process engineering and project management software tools
Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms
What You’ll Bring 10+ years of engineering experience in industrial, chemical, mineral processing, or similar process-intensive environments
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
Lithium processing and 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
Experience with direct or indirect leadership of engineers and technicians
Why This Role Mining is one of the most operationally complex industries on earth—and one of the least digitized. Most mines run on disconnected systems, tribal knowledge, and decisions made by feel rather than data.
At Mariana, you'll build the software that changes this. You'll work on autonomous haul trucks, integrated mine planning, and optimization systems that treat the entire mine as a single coordinated operation. If you want to work on hard problems with real-world stakes, this is it.
What It's Like to Work Here Extreme Ownership
– We take full responsibility for outcomes and drive relentlessly toward solutions.
Engineer Out, Then Automate
– We simplify and optimize before we scale.
Share Your Legos
– We collaborate openly, share knowledge freely, and help each other build better solutions.
Mariana is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected status.
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critical minerals powering modern energy, AI, and defense technologies .
We’re reimagining how minerals are sourced, refined, and optimized by combining deep industrial expertise with
software, automation, and data-driven decision-making . Join us as we build the future of responsible mineral sourcing and supply.
Role Overview Mariana Minerals is looking for a highly motivated Lead Process Engineer to work on building the critical minerals supply chain to support the world’s energy transition.
As the Lead Process Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the 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, identifying and evaluating new project opportunities for North American mineral refining, and supporting the buildout and leading an in-house process engineering team.
What You’ll Do Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp
Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes
Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes
Support the hiring, mentorship, and day-to-day management of junior process engineers
Develop technoeconomic models of new project opportunities, acquisition targets, and new technologies to inform business development
Prepare and present bankable engineering deliverables to support project financing partners due diligence reviews
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 flowsheets
Identify, evaluate, and implement process engineering and project management software tools
Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms
What You’ll Bring 10+ years of engineering experience in industrial, chemical, mineral processing, or similar process-intensive environments
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
Lithium processing and 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
Experience with direct or indirect leadership of engineers and technicians
Why This Role Mining is one of the most operationally complex industries on earth—and one of the least digitized. Most mines run on disconnected systems, tribal knowledge, and decisions made by feel rather than data.
At Mariana, you'll build the software that changes this. You'll work on autonomous haul trucks, integrated mine planning, and optimization systems that treat the entire mine as a single coordinated operation. If you want to work on hard problems with real-world stakes, this is it.
What It's Like to Work Here Extreme Ownership
– We take full responsibility for outcomes and drive relentlessly toward solutions.
Engineer Out, Then Automate
– We simplify and optimize before we scale.
Share Your Legos
– We collaborate openly, share knowledge freely, and help each other build better solutions.
Mariana is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected status.
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