# Process Engineer at Mariana Minerals

Process Engineer at Mariana Minerals in Moab, UT. On-site, full-time. Posted October 26, 2026.

- Company: Mariana Minerals
- Location: Moab, UT
- Workplace: On-site
- Job type: Full-time
- Experience: 2+ years
- Posted: 2026-10-26
- Apply: https://jobs.ashbyhq.com/marianaminerals/774bafd4-62ee-4fd8-a3f0-2e43019788ec/application
- Source: https://jobmagic.ai/jobs/process-engineer-mariana-minerals-wjnz44

## Requirements

- This role suits a hands-on hydrometallurgical/mechanical/chemical engineer who enjoys spending time in the plant, turning data into decisions, and seeing improvements through from idea to commissioning.
- 2+ years of process engineering experience in commissioning of chemical factories, mechanical equipment knowledge or project/design upgrades.
- Proven track record delivering process improvement projects with measurable results.

## Description

**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.
**Key responsibilitiesProcess ownership – SX and EW**

- Act as the engineering owner of the SX and EW circuits, including mixer-settlers, organic and electrolyte handling, tank house, cell house and associated utilities.

- Monitor daily plant performance (PLS grade and flow, extraction and stripping efficiency, phase continuity, entrainment, current efficiency, cathode quality) and act on deviations.

- Define and maintain operating envelopes, control set points and alarm limits together with operations and control engineers.

- Lead technical troubleshooting of process upsets such as crud formation, organic degradation, impurity build-up (Fe, Mn, Cl, NO₃), short circuits and poor cathode morphology.

- Manage reagent strategy for extractant, diluent, smoothing agents and cobalt sulfate, including consumption tracking and supplier technical liaison.

- Produce daily, weekly and monthly process performance reports and metallurgical balances.

**Process improvement**

- Identify, evaluate and lead improvement projects that increase recovery, throughput, current efficiency and cathode grade, or reduce energy, reagent and operating costs.

- Use data analysis, mass and energy balances, and process modeling to quantify opportunities and build business cases.

- Plan and run plant trials and test work with the laboratory, vendors and external partners, then implement and verify results.

- Drive root-cause analysis on recurring losses and production incidents, and track corrective actions to closure.

- Support control-system optimization and the use of instrumentation and online analyzers.

**Expansion and capital projects**

- Provide process input to studies for capacity expansion, debottlenecking and new circuits, from concept through feasibility and detailed design.

- Develop and review process design criteria, PFDs, P&IDs, mass balances, equipment sizing and datasheets.

- Represent operations in design reviews, HAZOP and constructability workshops so new assets are operable and maintainable.

- Support pre-commissioning, commissioning and ramp-up of new or modified equipment.

- Contribute to cost estimates, schedules and risk assessments for capital projects.

**Safety, standards and people**

- Apply process safety and management-of-change (MOC) practice to every process modification, with particular focus on fire risk in SX and acid mist in EW.

- Write and update SOPs, process descriptions and training material for operators.

- Coach operators, metallurgists and junior engineers, and share knowledge across teams.

- Support environmental compliance for effluents, emissions and organic losses.

**Required qualifications**
- This role suits a hands-on hydrometallurgical/mechanical/chemical engineer who enjoys spending time in the plant, turning data into decisions, and seeing improvements through from idea to commissioning.

- 2+ years of process engineering experience in commissioning of chemical factories, mechanical equipment knowledge or project/design upgrades.

- Proven track record delivering process improvement projects with measurable results.

### **Our culture is built on four principles:Everyone Gets Home Safe. **We never put speed or cost ahead of people.
**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!**