--- title: 'Mobile Maintenance Supervisor at Mariana Minerals' canonical: 'https://feeny.ai/job/mobile-maintenance-supervisor-mariana-minerals-moab-0zyyzma9tm1n' type: 'job' last_seen: '2026-09-11' --- # Mobile Maintenance Supervisor at Mariana Minerals - **Company:** Mariana Minerals - **Location:** Moab, UT - **Employment:** full-time - **Work type:** onsite - **Posted:** 2026-09-09 - **Last confirmed live:** 2026-09-11 - **Apply:** https://jobs.ashbyhq.com/marianaminerals/44e4b7c1-53bf-442c-aecf-31edf7920f70 ## Job description ## 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 The Mobile Maintenance Supervisor is a hands-on working supervisor responsible for leading a team of maintenance technicians and supporting the safety, reliability, and availability of Mariana’s growing mobile mining fleet. This role combines technical leadership, field troubleshooting, crew development, maintenance planning, and day-to-day operational decision-making. The ideal candidate will have a demonstrated track record of hands-on maintenance leadership, strong technical credibility, and a proactive, solutions-oriented approach to working in an evolving operation. They will enjoy solving problems in the field, developing technicians, improving processes, and helping build the systems, practices, and crew culture needed to support a growing fleet. Responsibilities: - Lead, supervise, and develop a team of maintenance technicians while maintaining a safety-first mentality and a strong culture of accountability, teamwork, and continuous improvement. - Conduct safety meetings and workplace inspections, address hazards, and ensure work is performed in accordance with company policies and applicable safety requirements. - Work hands-on alongside technicians to troubleshoot, diagnose, and repair heavy mobile mining equipment, including mechanical, hydraulic, and electrical systems. - Prioritize and coordinate daily maintenance activities based on safety, equipment criticality, production needs, labor, parts, and available resources. - Perform advanced troubleshooting and failure analysis using diagnostic tools, schematics, technical manuals, and equipment documentation. - Drive equipment reliability and availability through preventative maintenance, repair-quality review, equipment-status tracking, and identification of recurring failures. - Coordinate with planners, operations, and vendors to schedule repairs, manage work orders, source parts, and communicate repair requirements and expected downtime. - Train and mentor technicians, provide technical leadership in the field, and provide on-call support as needed, including serving as the senior maintenance representative when leadership may not be onsite. Required Qualifications: - Previous supervisory, lead technician, or crew-leadership experience, with the ability to coach technicians and provide technical direction in the field. - Minimum of 5 years of mining maintenance experience, with strong hands-on experience supporting heavy mobile mining equipment. - Strong troubleshooting and failure-analysis skills across mechanical, hydraulic, and electrical systems, including the ability to read hydraulic and electrical schematics; welding experience is a plus. - Experience with Caterpillar mobile mining equipment and electronic diagnostic tools; familiarity with CAT ET, CAT SIS, and direct experience with CAT 777 haul trucks and/or CAT 992K wheel loaders is strongly preferred. - Strong communication, organization, and problem-solving skills, with the ability to make decisions, take ownership, and work effectively in a growing operation where processes and systems are still being developed. - Experience using maintenance tracking systems and Microsoft Office applications. - Experience with autonomous mining technology is a plus. - Valid driver’s license required. Working Environment and Schedule: - Schedule: 7 days on / 7 days off, working 12-hour shifts. As operations expand, supervisors will rotate between day and night shifts and must be available for on-call coverage as needed. - Work Environment: Approximately 70% fieldwork and 30% office-based work. - Housing & Relocation: Housing and relocation assistance options are available 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! ## About Mariana Minerals ## Company Overview - **One-liner**: Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies. - **Entity Type**: Private (Series A, $85M funding in July 2025) - **Headquarters**: San Francisco, California, United States - **Founded**: Not publicly available - **Founders**: Turner Caldwell (Co-Founder & CEO) ## Core Business - **Primary industry**: Metal Ore Mining / Critical Minerals - **Target customers**: B2B – energy, AI, and defense supply chains (including downstream manufacturers and government entities) - **Mission or purpose**: "Create a future of critical mineral abundance" by reimagining the global minerals supply chain with software, automation, and data-driven decision making. ## Products & Services - **Copper One (formerly Lisbon Valley Copper Mine)**: World’s first autonomous mine, located in Utah. Produces copper using integrated automation and software control. Restarted production in April 2026. - **Lithium One**: Lithium project (on the roadmap or early development). - **Other mineral projects**: Graphite, Uranium, Rare Earth Metals, Cobalt, Nickel, Aluminium – at various stages (stealth or roadmap). - **CapitalProjectOS**: Internal software platform for capital project management (mentioned in leadership bio). - **Technology Stack**: React, dbt, TypeScript, Python, TensorFlow, PyTorch, microservices, SCADA, Autodesk, and many others – indicating a strong software engineering backbone. ## Market Standing - **Valuation/Market Cap**: Not disclosed (private company) - **Key Metric**: Total funding – $85M Series A (July 2025, 1 investor) - **Notable Investors/Partners**: Lead investor not publicly disclosed (Andreessen Horowitz was pitched but not confirmed as an investor). Partners include Bot Auto, WeRide, Pronto, Atoms (based on LinkedIn mentions). Also works with UMA (Utah Mining Association). - **Growth Signals**: Headcount grew 3,575% YoY to 107 employees (as of mid-2026). 73 active job postings. Opened the world’s first autonomous mine (Copper One) in April/May 2026, generating significant industry news and social media engagement. ## Competitive Advantages - **Software-first approach**: The company builds automation and data systems from the ground up, rather than layering tech onto legacy mining operations. This enables fully autonomous mining. - **Vertical integration**: They develop, own, and operate mineral projects, controlling the entire value chain from extraction to processing. - **Deep tech stack**: Use of AI/ML (TensorFlow, PyTorch), simulation, and real-time control systems to optimize mining operations. - **First-mover in autonomous mining**: Copper One is claimed to be the world’s first autonomous mine, giving them a significant lead in operational efficiency and safety. ## Strategic Focus - Scale autonomous mining operations beyond copper (lithium, graphite, uranium, etc.) - Secure domestic supply of critical minerals for U.S. energy, AI, and defense needs. - Continue aggressive hiring across engineering, operations, and field roles. - Expand from Utah to additional sites (Houston engineering office, potential new projects). ## Why Work Here - **Culture principles**: "Extreme Ownership", "Engineer Out Requirements, Then Automate", "Share Your Legos" – emphasizing accountability, simplification, and collaboration. - **Work environment**: High-growth startup with a mission-driven focus on critical infrastructure. Offices in San Francisco (HQ), Houston (Engineering), and La Sal, Utah (mine site). Hybrid/remote policy not explicitly stated, but multiple office locations suggest flexibility for field vs. office roles. - **Notable perks**: Opportunity to work on cutting-edge autonomous systems and AI in a traditional industry. Strong engineering culture with modern tech stack (React, Python, ML). Rapid career growth due to company expansion. - **Talent sources**: Attracts talent from Tesla, Redwood Materials, Lilac, ExxonMobil, Amazon Web Services, and other tech/energy companies – indicating a high-caliber peer group. ## Sources 1. [marianaminerals.com](https://marianaminerals.com/) 2. [marianaminerals.com/careers](https://marianaminerals.com/careers) 3. [marianaminerals.com/about](https://marianaminerals.com/about) 4. [jobs.ashbyhq.com/marianaminerals](https://jobs.ashbyhq.com/marianaminerals) 5. [linkedin.com/company/mariana-minerals](https://www.linkedin.com/company/mariana-minerals) ## Other roles at Mariana Minerals - [Sr./Staff Process Engineer - Detailed Engineering and Plant Design](https://feeny.ai/job/sr-staff-process-engineer-detailed-engineering-and-plant-design-mariana-m9xewg6hdcc5) — Houston, TX - [Industrial Electrician](https://feeny.ai/job/industrial-electrician-mariana-minerals-moab-snerjqgb4qbh) — Moab, UT - [Sr. Technical Recruiter](https://feeny.ai/job/sr-technical-recruiter-mariana-minerals-san-francisco-hr9b2676c4vw) — San Francisco, CA - [R&D Metallurgist](https://feeny.ai/job/r-d-metallurgist-mariana-minerals-san-francisco-2y0a92fe9ese) — San Francisco, CA - [Maintenance Mechanic](https://feeny.ai/job/maintenance-mechanic-mariana-minerals-moab-bc9jcgbeg61b) — Moab, UT - [Process Maintenance Technician](https://feeny.ai/job/process-maintenance-technician-mariana-minerals-moab-c6pyeb53jmef) — Moab, UT - [Sr./Staff Pyrometallurgical Process Engineer](https://feeny.ai/job/sr-staff-pyrometallurgical-process-engineer-mariana-minerals-houston-dpv5c9qyznbb) — Houston, TX - [Electrician](https://feeny.ai/job/electrician-mariana-minerals-east-50vs2farzxq5) — East, TX - [Staff Process Controls Engineer - Networking and Systems Administration](https://feeny.ai/job/staff-process-controls-engineer-networking-and-systems-administration-mariana-yysg2twzjx6r) — San Francisco, CA - [Staff Process Controls Engineer - Pilot Plant](https://feeny.ai/job/staff-process-controls-engineer-pilot-plant-mariana-minerals-san-francisco-f58dynjt6zw6) — San Francisco, CA