Mechanical Maintenance Technician

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About this role

Mechanical Maintenance Technician San Francisco HQ, San Francisco, California, US 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 looking for a highly motivated Mechanical Maintenance Technician to join our San Francisco Pilot Plant team. You will support the design, installation, and maintenance of first-of-its-kind refining processes for critical minerals. This position plays a critical role in bridging R&D and Operations, ensuring our equipment and work processes are robust, safe, cost-effective, and suitable for commercial production. What You'll Do - Perform preventive and corrective maintenance on plant equipment including pumps, valves, piping systems, filtration units, and other process equipment. - Troubleshoot and repair mechanical issues to maintain safe and reliable plant operations. - Assist with fabrication, installation, modification, startup, and commissioning of new equipment and pilot plant systems. - Read and interpret engineering drawings, P&IDs, and equipment manuals to support maintenance and installation work. - Safely perform maintenance activities following plant safety procedures including Lockout/Tagout (LOTO), hot work permitting, and confined space entry. - Identify and maintain critical spare parts for the pilot plant - Champion the site Computerized Maintenance Management System (CMMS) system Desired Qualifications - Associate degree, technical certificate, or equivalent hands-on experience in industrial maintenance, mechanical technology, millwright work, or a related field. - 3+ years

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