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 Mechanical Engineering Intern to work on real, high-impact problems within the Process & Plant Engineering team. You will contribute directly to our Deep Sea Nodule Refining Pilot Plant 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

• Assist with mechanical design and specification of equipment for a multi-metal pyrometallurgical and hydrometallurgical pilot plant, including vessels, pumps, heat exchangers, and material handling systems

• Support preparation of equipment datasheets, procurement packages, and vendor drawing reviews

• Assist with physical installation activities on-site, including layout coordination, alignment checks, and interfacing with fabrication and construction contractors

• Participate in commissioning activities including pre-commissioning inspections, punch list tracking, and functional testing of mechanical systems

• Maintain organized documentation of as-built conditions, equipment records, and commissioning logs

Desired Qualifications

• Currently pursuing a B.S. or M.S. in Mechanical Engineering, with coursework in fluid mechanics, machine design, or materials

• Exposure to piping systems, pressure vessels, or rotating equipment design is an asset

• Comfortable working in an active construction or industrial environment with appropriate safety protocols

• Strong attention to detail and ability to read and mark up engineering drawings and P&IDs

• Proactive, hands-on work style; prior internship or co-op experience in an industrial or manufacturing setting is 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.