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!