Jobs at Mariana Minerals

Lead development and implementation of project controls (cost, schedule, change, risk) for large-scale mining and refining capital projects. Manage budgets, forecasts, contractor schedules in Primavera P6, variance analyses, progress payments, change orders, and risk assessments. Provide dashboards and recommendations to executives, ensure compliance with safety and environmental permits, and embed digital project controls and governance across projects.

Lead technical direction for autonomous mineral refining by designing, validating, and deploying RL-based control models. Own autonomy roadmap, set simulator and modeling standards, solve sim-to-real and non-stationarity problems, partner with domain experts and leadership on techno-economic decisions, and mentor engineers while delivering production ML that runs on live plant equipment.

Develop and train reinforcement-learning control models in realistic simulators, refine training environments and reward logic, analyze and improve model performance, close the sim-to-real gap with plant data, write well-tested production code, and collaborate with process and chemistry experts to deploy autonomous controllers optimizing recovery, reagent use, energy, and uptime.

Design and own end-to-end data domains and pipelines for plant sensors, lab results, and historians. Build schemas, ensure data quality, observability, and lineage, and supply model-ready time-series and analytical datasets to ML and operations teams. Mentor junior engineers and define data contracts.

Develop, maintain, and analyze integrated project schedules for engineering, procurement, construction, and commissioning. Monitor progress, perform critical path and risk analysis, support planning workshops, prepare performance reports and KPIs, and recommend mitigation to keep projects on schedule and aligned with company procedures and industry best practices.

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.

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

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.

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.

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.

Serve as the COO's strategic partner to drive multi-site operational initiatives, improve production performance, deploy automation and technology, lead large transformation programs, establish operating rhythms and KPIs, and travel extensively to ensure alignment and execution across production sites.

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 development and operation of a pilot minerals processing facility, managing design, construction, safety regulations, and team operations while ensuring process scalability.

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.