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About the Role

Mariana Minerals is seeking a Mechanical Engineer to contribute to building the critical minerals supply chain for the energy transition. This role involves leading the development and deployment of chemical refining processes, supporting software development for project execution and plant optimization, and designing, building, and commissioning mineral processing and metallurgical refining equipment. It's a hands-on position focused on first-principles engineering for advanced mineral refining facilities.

Responsibilities

Lead mechanical engineering scopes across project phases—from concept and feasibility through detailed design, procurement, fabrication, installation, and commissioning
Manage vendors throughout the equipment lifecycle—from specification, RFQ, and technical bid evaluation through drawing review and approval, fabrication expediting and inspection (ITP/FAT), delivery, installation and commissioning support, and warranty close-out
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
Perform static equipment design of tanks, silos, bins, pressure vessels, and other stationary equipment, including mechanical sizing, wall/shell thickness, and structural load calculations ensuring code compliance
Conduct finite element analysis (FEA) to validate equipment and component designs for stress, fatigue, thermal, and operational loading conditions
Design, evaluate, and integrate solids-handling and material-conveyance systems, including silos, bins, hoppers, feeders, conveyors, 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

Requirements

Bachelor’s degree in Mechanical Engineering or a related engineering discipline
Strong understanding of engineering fundamentals and demonstrated ability to leverage that understanding to solve challenging problems
Experience preparing and reviewing mechanical equipment specifications, vendor documentation, and engineering deliverables for both brownfield modifications and greenfield facilities
Demonstrated ability to complete static equipment design of tanks, silos, bins, vessels, and other stationary equipment, including code-based mechanical and structural calculations
FEA capabilities—proficiency with finite element analysis tools to validate equipment and component designs for stress, fatigue, and thermal/operational loading
Working knowledge of relevant industry standards and codes, such as ASME and API
Ability to work effectively with cross-functional teams, manage competing priorities, and deliver high-quality engineering packages under schedule constraints
Proficiency in mechanical design software such as AutoCAD
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
Experience with pyrometallurgical processes and equipment, such as rotary kilns, electric arc furnaces, converters, dryers, and flash kilns
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
Experience with fluids, thermal, and Multiphysics CFD simulations

Skills

Mechanical Engineering
Chemical Refining Processes
Software Development
Project Execution
Plant Optimization
Mineral Processing Equipment Design
Metallurgical Refining Equipment Design
First-Principles Modeling
Equipment Scopes
Design
Build
Commissioning
Installation
Ramp
Handover
Vendor Management
Plant Layouts
Equipment Specifications
Data Sheets
Requisition Packages
Technical Bid Evaluation
Static Equipment Design
Finite Element Analysis (FEA)
Solids-Handling Systems
Material Conveyance Systems
3D Modeling
Piping Design
Mechanical Interface Layouts
Code Compliance
ASME
API
AutoCAD
Solids-Handling Equipment
Conveyance Equipment
Pyrometallurgical Processes
Rotary Kilns
Electric Arc Furnaces
Converters
Dryers
Flash Kilns
Industrial Environments
Process Industry Environments
Mining
Mineral Processing
Cement
Aggregate
Bulk-Materials Handling
Chemical Manufacturing
Industrial Manufacturing
Power Generation
Heavy Industrial Sectors
Fluids Simulation
Thermal Simulation
Multiphysics CFD Simulation

Location

Onsite

Work Type

Full-time

Experience Level

Mid-level
Senior-level

Education Level

Bachelor's degree in Mechanical Engineering or related engineering discipline

Benefits

Autonomy to make big decisions
Tools to innovate
Culture that values ownership, smart automation, and collaboration

About the Company

Mariana Minerals is a software-first, vertically integrated minerals company.
The company's mission is to supply critical minerals powering modern energy, AI, and defense technologies.
They are reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
They are building the future of responsible mineral sourcing and supply.

Equal Opportunity

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.