Analytical Lab Chemist

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.

Join our laboratory team as an

• Analytical Lab Chemist.
• This senior-level role focuses on high-quality sample preparation and routine analytical testing, with a particular emphasis on ion chromatography (IC). The ideal candidate is a disciplined scientist who prioritizes lab safety, enjoys hands-on analytical work, and has a solid understanding of IC, spectroscopic instrumentation and other chemical analysis equipment.

Key Responsibilities

• Operate, calibrate and troubleshoot analytical instruments, particularly ion chromatography (IC), along with ICP-OES/MS and XRF
• Perform precise sample preparation across various matrices, including weighing, digestion, dilution and filtration, with zero cross-contamination
• Prepare standards and calibration solutions, and run routine analytical testing with accurate, reliable results
• Record observations and raw data accurately in LIMS or lab notebooks, and review results for integrity
• Flag instrument or data issues early and help work out the cause
• Keep a clean, organized workspace and manage chemical inventory and waste disposal to regulatory standards
• Follow all SOPs, chemical hygiene plans and PPE requirements to keep the lab safe

Required Qualifications

Associate or bachelor’s degree in Chemistry, Biochemistry or a closely related scientific field

Hands-on ion chromatography (IC) experience strongly preferred

Demonstrated proficiency in wet chemistry techniques (pipetting, titration, acid digestion)

Familiarity with the principles of analytical instrumentation

Hands-on experience or academic exposure to titration, Flame AA, ICP-OES/MS or XRF is a plus

Knowledge of EPA, ISO or GLP/GMP standards

Strong attention to detail, excellent time management, a collaborative approach and a willingness to learn new skills

Schedule

Full-time, Monday–Friday, day shift, based at our San Francisco HQ

Working Environment & Physical Requirements

• Laboratory setting with regular handling of acids, solvents, and other hazardous chemicals
• Required PPE includes lab coat, safety glasses, gloves, and closed-toe shoes
• Ability to stand at a lab bench for extended periods

Ability to lift up to 25 lbs

Fine motor skills for precise pipetting, weighing, and instrument handling

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!