# R&D Metallurgist at Mariana Minerals

- Company: Mariana Minerals
- What the company does: Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies. Backed by Khosla and a16z.
- Company website: https://marianaminerals.com/
- Type: Startups
- Level: Mid level
- Location: San Francisco HQ
- Work setup: On-site
- Pay: $110K to $140K base salary per year (USD)
- Posted: 2026-09-10
- Apply by: 2026-10-25
- Apply: https://jobs.ashbyhq.com/marianaminerals/15a2ddc3-c9c1-4d00-abd8-790a2151e8b2
- Page: https://www.1752.vc/careers/jobs/mariana-minerals-r-and-d-metallurgist/

## About 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. Develop Design of Experiments (DOE) protocols for chemical processing, extraction, and purification

## What they're looking for

- 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)

Tags: Process Development