Jobs at Mariana Minerals

Serve as a strategic HR Business Partner and hands-on generalist: advise leaders on compensation, performance, org design, and workforce planning; manage onboarding/offboarding and HRIS administration; coach on employee relations and investigations; drive engagement and talent development; analyze workforce data and scale HR processes.

Lead mechanical engineering for mineral processing and metallurgical refining projects: design, specify, and validate static equipment and solids-handling systems; perform FEA and CFD analyses; develop plant layouts and 3D models; manage vendors through procurement, fabrication, and commissioning; and provide on-site construction and start-up support while collaborating with multidisciplinary teams.

Execute month-end close; prepare journal entries, accruals, and reconciliations; maintain multi-entity general ledgers; support financial statement preparation, audits, tax filings, and FP&A collaboration; improve accounting processes and internal controls.

Lead and enforce site safety, health, and security for a 24/7 open-pit mine. Ensure MSHA/OSHA compliance, conduct training, manage incident investigations and reporting, liaise with regulators, support Workers Comp and drug/alcohol policy enforcement, and collaborate with managers to drive continuous safety improvements.

The Process Engineer will oversee bioleaching columns and pilot-scale equipment, bridging R&D and operations to optimize processes for commercial mining.

Develops and optimizes heat and material balance models for refining processes, automates equipment sizing, and conducts optimization studies, ensuring model accuracy and integration into engineering deliverables.

The RC Driller Assistant helps in reverse circulation drilling by setting up equipment, collecting samples, performing maintenance, and ensuring safety during operations.

Own end-to-end pre-operational procurement for new projects and sites: define specs with engineering, run RFQs, qualify vendors, negotiate contracts, execute purchases, manage first deliveries, consolidate sourcing for volume savings, and transition vendor relationships to on-site procurement.

Design, prototype, and validate electromechanical and robotic hardware for autonomous mining vehicles, including drive-by-wire actuation, motion and powertrain systems, manipulators, and end-effectors. Produce CAD, BOMs, select components, lead bench and field testing, and collaborate with controls and autonomy teams to integrate hardware, sensing, and compute for fully autonomous operation.

Lead end-to-end execution of Mariana's capital project programs from development through construction, owning schedules, budgets, risk management, and cross-functional coordination. Manage and grow a team of Technical Program Managers, drive deployment of capital-project software tools, standardize project development and execution, and partner with finance and business development on capital allocation and project economics.

Design, implement, and validate autonomy software for mining vehicles including perception, localization, mapping, motion planning, and control. Integrate and calibrate LiDAR, camera, radar, IMU/GNSS sensors; build embedded real-time software; develop simulation and data pipelines; and lead bench, rig, and field validation while collaborating with hardware and controls teams.

The Hydrometallurgical Process Engineer will lead the development of hydrometallurgical refining processes and manage equipment scopes from concept to execution, optimizing mineral extraction and collaborating with various teams for integration with software and automation.

The Project Engineering Manager leads engineering teams, manages project workflows, coordinates reviews, and ensures timely deliverables for critical minerals supply chain projects.

Lead the planning and design for greenfield mining projects, including site selection, feasibility studies, and civil works design. Collaborate with multiple teams for optimal site infrastructure design and manage external engineering partners.

Lead the development of high-temperature refining systems, design and validate thermal process flowsheets, optimize metal recovery and energy efficiency, and collaborate with R&D teams for process automation.

Lead the development and deployment of chemical refining processes, oversee controls programming, manage equipment and teams, and support project execution and business development.

The Drill and Blast Engineer will design, execute, and optimize drilling and blasting operations at a copper site, ensuring safety and regulatory compliance.

The Staff Program Manager will oversee operational performance, improve business processes, manage site digitization, and facilitate internal communications.

As a Metallurgy Lead, you'll optimize metallurgical processes, design test programs, track performance, collaborate with teams, and promote safety compliance.

The Staff Process Engineer will lead process design and operation for pilot plants, focusing on mineral processing and technology scale-up. Responsibilities include equipment design, pilot-scale experiments, and process optimization while ensuring safety and compliance.