Pilot Plant Technician - San Francisco, CA

Mariana Minerals is a cutting-edge, software-first minerals company dedicated to addressing the global supply chain challenges related to critical minerals. These minerals are essential components in modern technologies such as energy systems, artificial intelligence, and defense infrastructures. Mariana Minerals operates as a vertically integrated firm that focuses on the engineering, construction, commissioning, and optimization of both greenfield and brownfield minerals assets. By leveraging recent advances in artificial intelligence and machine learning, Mariana aims to accelerate the development of these critical mineral resources faster than conventional approaches allow. The company’s mission-driven culture promotes open and honest communication alongside a dynamic, passionate team environment. With an emphasis on big-picture thinking and innovation, Mariana Minerals seeks to transform the critical minerals market – a market currently facing unprecedented concentration and supply risks – by creating a more resilient and sustainable supply chain from mine to end-use technology. The company is currently seeking a dedicated Pilot Plant Technician to join its growing team. This role is integral in supporting the hands-on chemical and mechanical operations in Mariana’s pilot plant facilities. The Pilot Plant Technician will work closely with engineers and fellow technicians to run and optimize chemical processes including precipitation, filtration, ion exchange, and membrane concentration. Responsibilities also involve troubleshooting and maintaining process equipment and instrumentation, ensuring all plant operations comply with safety standards, and assisting with the installation and testing of new equipment. The Technician is expected to maintain operational organization including spare parts inventories and overall cleanliness, document procedural tasks accurately, and contribute to commissioning efforts. This position demands a highly motivated individual who thrives in a startup environment, enjoys solving complex problems, and is passionate about advancing clean energy and critical mineral technologies. This full-time role nurtures professional growth, emphasizing both safety and efficiency, and offers the opportunity to work at the forefront of critical mineral supply chain innovation.

• 3+ years of experience operating safely in hands-on pilot operation or equipment maintenance environment
• Ability to climb stairs, stand for extended periods of time, and safely lift up to 50 lbs
• Willingness to follow safety protocols and company policies at all times
• Effective communication skills and ability to work collaboratively in a team setting
• Basic understanding of chemical processes relevant to mineral operations
• Proficiency in documenting procedures and observations
• Physical ability to manage routine maintenance tasks and equipment handling