# R&D Metallurgist at Mariana Minerals

R&D Metallurgist at Mariana Minerals in San Francisco HQ. On-site, full-time, paying $110k–$140k. Posted September 10, 2026.

- Company: Mariana Minerals
- Location: San Francisco HQ
- Workplace: On-site
- Job type: Full-time
- Pay: $110k–$140k
- Experience: 5+ years
- Posted: 2026-09-10
- Apply: https://jobs.ashbyhq.com/marianaminerals/15a2ddc3-c9c1-4d00-abd8-790a2151e8b2/application
- Source: https://jobmagic.ai/jobs/rd-metallurgist-mariana-minerals-67ghgh

## Requirements

- Bachelor's degree in Chemistry, Chemical Engineering, Metallurgy, or related technical field preferred

## 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.
**The Role**

- The R&D Metallurgist designs, executes, and analyzes experiments to advance Mariana Minerals' hydrometallurgical testing programs. This hands-on laboratory and pilot-scale role focuses on running DOE protocols, operating tank reactors and mining systems, and analyzing data to optimize extraction for critical minerals.

**What You'll Do**

- Develop Design of Experiments (DOE) protocols for chemical processing, extraction, and purification

- Analyze metallurgical and process data to identify trends, root causes, and optimization opportunities

- Operate tank reactors, filtration systems, separation equipment, and purification units at bench and pilot scale

- Prepare chemical solutions and reagents according to experimental specifications

- Monitor and control process parameters: temperature, pH, flow rates, residence time, and reagent dosing

- Perform systematic sampling and material handling throughout process streams

- Collect experimental data including process parameters, weights, volumes, and analytical results

- Analyze data using Excel and statistical tools to evaluate performance and identify optimization opportunities

- Generate clear data visualizations, charts, and summary reports

- Maintain detailed laboratory notebooks and digital documentation

- Support DOE planning and multi-variable optimization studies

- Perform routine maintenance, calibration, and troubleshooting of processing equipment

- Follow all chemical handling, PPE, and MSHA/OSHA safety protocols

- Maintain clean, organized, and safe laboratory environments

- Conduct hazard assessments for chemical processes and experimental setups

**Desired Qualifications**

- Bachelor's degree in Chemistry, Chemical Engineering, Metallurgy, or related technical field preferred

- 5+ years' experience in chemical processing, hydrometallurgy, or laboratory/pilot plant operations

- Experience with Design of Experiments (DOE) methodology and statistical analysis highly desirable

- Hands-on experience with chemical reactors, filtration, and separation equipment

- Advanced Excel proficiency (pivot tables, statistical functions, data visualization)

- Understanding of chemical process fundamentals (mass balance, stoichiometry, reaction kinetics)

- Knowledge of purification techniques (precipitation, solvent extraction, ion exchange, crystallization)

- Ability to read P&IDs and process flow diagrams

- Experience with DOE software (JMP, Minitab, Design-Expert) is a plus

- Exceptional attention to detail and data integrity

- Strong analytical and problem-solving skills

- Excellent communication and documentation abilities

- Self-motivated with ability to manage multiple experiments

- Unwavering commitment to safety and quality

- Valid driver's license required

### **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!**