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

We are hiring a Chemical Engineering Intern to work on real, high-impact problems within the Process & Plant Engineering team. You will contribute directly to our LithiumOne project, working closely with engineers and domain experts.

This role is designed to provide hands-on experience building and shipping solutions, not just supporting tasks.

What You’ll Do

• Support development and refinement of process flow diagrams (PFDs) and piping & instrumentation diagrams (P&IDs) for a lithium brine extraction and purification flowsheet

• Assist with mass and energy balance modeling across key unit operations including evaporation, impurity removal, and lithium product conversion

• Conduct literature reviews and vendor engagement to evaluate reagent selection, membrane technologies, and downstream processing options

• Support preparation of engineering deliverables for feasibility and prefeasibility studies, including input to equipment sizing and capital cost estimation

• Assist with laboratory or pilot-scale test work data analysis to validate process assumptions and inform flowsheet optimization

Desired Qualifications

• Currently pursuing a B.S. or M.S. in Chemical Engineering, with coursework in thermodynamics, mass transfer, and reaction engineering

• Familiarity with process simulation tools (e.g., METSIM, Aspen, or similar) is an asset

• Strong analytical and technical writing skills; ability to synthesize data into clear engineering summaries

• Interest in hydrometallurgy, critical minerals, or battery materials supply chains preferred

• Proficiency in Excel for data analysis; experience with Python or MATLAB a plus

Why Join Us?

At Mariana Minerals, you’ll be part of a mission-driven team reshaping the way critical minerals are sourced and supplied globally. You’ll have the autonomy to make big decisions, the tools to innovate, and a culture that values ownership, smart automation, and collaboration.

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.

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.