---
title: "R&D Metallurgist"
company: "Mariana Minerals"
company_url: "https://www.remjobs.works/companies/mariana-minerals"
url: "https://www.remjobs.works/job/mariana-minerals-r-d-metallurgist-fd61bd23-5a62-4c51-84ae-7c7b410860ed"
apply_url: "https://jobs.ashbyhq.com/marianaminerals/15a2ddc3-c9c1-4d00-abd8-790a2151e8b2"
workplace: onsite
location: "San Francisco HQ"
employment_type: full-time
seniority: mid
role: other
region: united-states
skills: ["excel"]
salary: "$110,000–$140,000 per year"
date_posted: 2026-09-10T16:35:12.523Z
first_seen_by_remjobs: 2026-09-10T16:59:12.482Z
---

# R&D Metallurgist

**Mariana Minerals** · San Francisco HQ

Salary: $110,000–$140,000 per year

Apply: https://jobs.ashbyhq.com/marianaminerals/15a2ddc3-c9c1-4d00-abd8-790a2151e8b2

## About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies.

## About the role

### 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!**

---

Source: Mariana Minerals's own career page, read by RemJobs. Canonical HTML version: https://www.remjobs.works/job/mariana-minerals-r-d-metallurgist-fd61bd23-5a62-4c51-84ae-7c7b410860ed