Mechanical Engineer
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 Mechanical Engineer to work on building the critical minerals supply chain to support the world’s energy transition.
As a Mechanical 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 project execution and plant optimization. Responsibilities will include designing, building, and commissioning pilot and modular commercial scale plants, developing first principles based models of refining equipment and processes, and leading equipment scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team.
What You’ll Do
Lead mechanical engineering scopes across project phases—from concept and feasibility through detailed design, procurement, fabrication, installation, and commissioning
Develop site-wide and area-level plant layouts, optimizing equipment arrangement, maintainability access, constructability, safety, and integration with other disciplines
Prepare mechanical equipment specifications, data sheets, and requisition packages for a range of process and solids-handling equipment, and support technical bid evaluations and vendor selection
Design, evaluate, and integrate solids-handling and material-conveyance systems, including silos, bins, hoppers, feeders, conveyors (belt, screw, drag), bucket elevators, chutes, and dust-control systems
Support development of 3D models and piping/mechanical interface layouts, ensuring alignment with process, structural, civil, and electrical engineering requirements
Review vendor drawings and calculations, ensuring mechanical design compliance with project requirements, codes, standards, and operability/maintainability expectations
Collaborate with multidisciplinary EPC teams—including process, structural, piping, electrical, instrumentation, and construction management—to deliver cohesive and constructible engineering packages
Provide mechanical engineering support during construction and commissioning, including responding to RFIs, reviewing field changes, and assisting with equipment installation and start-up
What You’ll Bring
Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems
Experience preparing and reviewing mechanical equipment specifications, vendor documentation, and engineering deliverables for both brownfield modifications and greenfield facilities
Hands-on experience with solids-handling and conveyance equipment, including:
Silos, bins, hoppers, chutes, and bulk storage systems
Feeders (vibratory, belt, screw, rotary, apron)
Conveyor systems (belt, screw, drag/chain, pneumatic, bucket elevators)
Screens, crushers, and material-transfer equipment
Familiarity with industrial and process-industry environments, such as:
Mining and mineral processing
Cement, aggregate, or bulk-materials handling
Chemical or industrial manufacturing facilities
Power generation or heavy industrial sectors
Working knowledge of relevant industry standards and codes, such as CEMA, ASME, API, and material-handling design guidelines
Ability to work effectively with cross-functional teams, manage competing priorities, and deliver high-quality engineering packages under schedule constraints
Proficiency in mechanical designs software such as AutoCAD
Experience with fluids, thermal, and Multiphysics CFD simulations a plus
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.