Sr. Environmental Engineer

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

Mariana Minerals is hiring a Sr. Environmental Engineer to provide technical environmental engineering support across our U.S. mining, processing, and refining project sites in a fast-paced, multi-project environment. Reporting to the Global Environmental Permitting Lead, you will apply your engineering background to environmental studies, permitting technical support, monitoring program design, and the integration of environmental requirements into engineering and design decisions across FEL 1–3, detailed design, construction, and operations.

This role requires the ability to move quickly across multiple concurrent projects, prioritize effectively, and deliver high-quality technical work under compressed timelines. You will also support due diligence and sustainability initiatives, and work closely with the Global Environmental Permitting Lead, the Regional Permitting and Compliance Environmental Engineer, and internal stakeholders (process engineering, operations, legal, and executive leadership) as needed.

WHAT YOU'LL DO

Technical Environmental Engineering

- Conduct and oversee environmental technical studies (air quality modeling, water quality/hydrology assessments, stormwater design, waste characterization) supporting permitting and compliance across multiple concurrent projects.

- Design and implement environmental monitoring programs (air, water, stormwater, wildlife) and analyze results to support compliance reporting and technical decision-making.

- Support integration of environmental requirements into FEL 1–3 and detailed design, partnering with process and civil engineering teams on...