Full-Time
Maintenance Mechanic
Posted on 9/10/2026
Mariana Minerals
51-200 employees
Software-driven mineral exploration and supply
No salary listed
Moab, UT, USA
In Person
Housing and relocation assistance options are available.
 Automotive Service & Repair (1) |
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- High school diploma or GED.
- A minimum of 3 years of maintenance experience in mining, heavy equipment, construction, industrial, or similar environments.
- Strong working knowledge of diesel engines, hydraulics, drivetrains, electrical systems, and heavy equipment components.
- Ability to read and interpret schematics, service manuals, and diagnostic documentation.
- Proficiency with troubleshooting tools, mechanical testing equipment, and service trucks.
- Ability to work safely in an active mine environment and perform physically demanding tasks.
- Experience working on Caterpillar, Komatsu, or other large mining equipment brands.
- Familiarity with computerized maintenance management systems.
- Welding and fabrication skills, including MIG welding, stick welding, and cutting.
- Experience performing field repairs in remote or rugged conditions.
- Knowledge of predictive maintenance and equipment health monitoring techniques.
- Availability to work a 7-days-on, 7-days-off schedule with 12-hour shifts, rotating day and night shifts as operations expand, and on-call coverage as needed.
- Ability to walk long distances over rough or uneven terrain, climb ladders and structures, and lift a minimum of 50 pounds.
- Ability to work safely in all weather conditions, including extreme temperatures, and in environments with potential exposure to dust, fumes, diesel exhaust, solvents, sulfuric acid, and other hazardous materials.
- Must wear and properly use required personal protective equipment, including a hard hat, steel-toed footwear, safety glasses, high-visibility vest, hearing protection, a respirator when required, and protective clothing.
- Diagnose, troubleshoot, and repair mechanical, hydraulic, electrical, and pneumatic systems on mobile mining equipment, including haul trucks, loaders, dozers, graders, and ancillary equipment.
- Conduct preventive maintenance, routine inspections, and condition-monitoring activities in accordance with original equipment manufacturer guidelines and established maintenance schedules.
- Diagnose equipment failures, identify root causes, complete corrective repairs, and support reliability initiatives that improve equipment availability and reduce downtime.
- Service and repair auxiliary equipment, including light vehicles, compressors, pumps, generators, and other site equipment as needed.
- Perform maintenance in shop and field environments while safely operating service trucks, cranes, lifting devices, specialty tools, and diagnostic equipment.
- Document inspections, repairs, parts used, equipment condition, and maintenance activity in work orders, logs, and maintenance systems.
- Follow Mine Safety and Health Administration regulations, lockout/tagout procedures, personal protective equipment requirements, company policies, and equipment-specific standard operating procedures.
- Maintain safe, organized work areas.
- Work in active mining areas, rugged terrain, and outdoor conditions, with approximately 70% field-based and 30% office-based work.
- Technical or vocational training in mechanics or maintenance.
Mariana Minerals is a software-first minerals company focused on identifying, acquiring, exploring, and supplying critical minerals needed for energy, AI, and defense. It uses a proprietary software platform to pinpoint mineral assets with strong potential, then buys mineral rights, develops the resources, and sells them to customers in energy, AI infrastructure, and defense. The company is vertically integrated, handling everything from asset acquisition to development and supply, which sets it apart from traditional mines that don’t leverage digital tools or own the full value chain. Its main goal is to rebuild and secure the United States’ domestic supply chain for these strategic resources, addressing national security and vulnerability in global mineral markets.
Company Size
51-200
Company Stage
Series B
Total Funding
$395M
Headquarters
Houston, Texas
Founded
2024
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Simplify's Take
What believers are saying
- August 3, 2026 Series B raised $310 million, lifting total capital to $400 million.
- Sandvik and Pronto deployments extend automation across drilling and haulage in 2026.
- TMC signed a July 21, 2026 Brownsville services agreement, validating Mariana's process expertise.
What critics are saying
- Copper One still depends on brownfield Utah assets; one mechanical failure stops revenue.
- Lithium One targets first-half 2027 production; delays burn capital before commercial output.
- A software-heavy mining strategy faces fatal execution risk if autonomy underperforms humans.
What makes Mariana Minerals unique
- MarianaOS unifies MineOS, PlantOS, and CapitalProjectOS into one operating stack.
- Copper One restarted under autonomous orchestration in April 2026, proving retrofit execution.
- Khosla, a16z, BEV, and BHP Ventures back its software-first mining thesis.
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Benefits
Health Insurance
Paid Vacation
Remote Work Options
Flexible Work Hours
401(k) Retirement Plan
Wellness Program
Mental Health Support
Conference Attendance Budget
Professional Development Budget
Stock Options
Company Equity
Phone/Internet Stipend
Home Office Stipend
Growth & Insights and Company News
6 month growth
↑ 30%1 year growth
↑ 30%2 year growth
↑ 65%Mariana Minerals raises $310 million Series B led by Khosla Ventures to accelerate critical minerals production. Aug 03, 2026, 09:00 ET The round funds the expansion of its portfolio of critical minerals projects and further deployment of its software platform, MarianaOS. SAN FRANCISCO, Aug. 3, 2026 /PRNewswire/ - Mariana Minerals ("Mariana"), a software-first, vertically integrated critical minerals company, today announced it has raised $310 million in Series B financing. The round was led by Khosla Ventures, with continued support from Andreessen Horowitz (a16z) and Breakthrough Energy Ventures, and new participation from Greenoaks, Halo Fund, Pax Ventures, StepStone Group, BHP Ventures, Washington Harbour Partners, Greycroft, General Innovation Capital Partners, Mitsubishi Corporation, In-Q-Tel (IQT), and Earthshot Ventures, with a number of additional strategic capital partners joining the round. This round brings the company's total parent and project capital raised to date to approximately $400 million. Mariana engineers, builds, and operates mines and refineries using its proprietary MarianaOS platform, which integrates capital project execution (CapitalProjectOS), refinery operations (PlantOS), and mine management (MineOS) into a single AI and machine learning stack. MarianaOS compresses traditional 5-to-10 year project execution timelines by roughly half and reduces commissioning timelines well below industry benchmarks. Mariana's Series B financing unlocks continued buildout of the company's active project portfolio, including its flagship sites Copper One in Southeastern Utah and Lithium One in East Texas. Copper One, acquired by Mariana in late 2025, restarted mining operations under autonomous orchestration within 4 months and is ramping toward a production target of 50,000 metric tons of refined copper per year. Lithium One, which broke ground in Q4 2025, is the world's first GWh-scale facility for producing lithium from oil & gas produced water, with commercial production targeted for the first half of 2027. "Critical minerals are the materials that decide whether America builds its own future or keeps depending on China to build it instead. We backed Mariana because Turner is the kind of operator who can actually build and run AI-driven mines and refineries, faster and cleaner than anyone thought possible," said Vinod Khosla, founder of Khosla Ventures. "The minerals are there. What's been missing is the will and the AI to run mining and refining autonomously. That's exactly what Turner's team is building and why we backed them from day one." This financing accelerates the company's goal of developing 10 commercial-scale projects in 10 years to strengthen domestic supply of critical minerals. Mariana's project portfolio is designed to be catalytic: each project generates operational data that improves MarianaOS, reducing the cost and time to build and operate the next facility. "The critical minerals race is an execution problem, and we've spent the last two years proving that better software changes the math," said Turner Caldwell, CEO and Co-Founder of Mariana Minerals. "This additional capital lets us move from proving the model to scaling it; the time to build an autonomy-first minerals company, one that actually moves the needle on supply, is now." About Mariana Minerals Mariana Minerals is a software-first, vertically integrated critical minerals company that builds and operates mines and refineries across the metals that the modern economy depends on. For more information, visit marianaminerals.com. SOURCE Mariana Minerals
The last century was fueled by oil and gas. Turner Caldwell is betting the next century runs on metals. “We’re entering a metals-driven economy,” said Caldwell, CEO and cofounder at Mariana Minerals, a software-focused mining startup. “Lithium and copper are going to be core, but our mandate needs to be broader than that. We’re starting …
Mariana Minerals raised $310M, Valar Atomics raised $1B, OLIX raised $312M, The Intelligence Company raised $7.9M. Frontrun flagged all four first. tl;dr: Mariana Minerals raised a $310M Series B led by Khosla Ventures. Valar Atomics raised a $1B Series B led by Sequoia, plus a $200M credit facility. OLIX raised a $312M Series B at a $3.3B valuation. The Intelligence Company raised a $7.9M seed led by Index Ventures at $60M ARR. all announced august 3 2026. frontrun flagged them 104, 168, 91, and 168 days before the news, and the follow graph called all four rounds before the press did. who led Mariana Minerals' $310M Series B? Mariana Minerals raised a $310M Series B led by Khosla Ventures, with continued support from a16z and Breakthrough Energy Ventures, and new participation from Greenoaks, Halo Fund, Pax Ventures, StepStone Group, BHP Ventures, Washington Harbour Partners, Greycroft, General Innovation Capital Partners, Mitsubishi Corporation, In-Q-Tel, and Earthshot Ventures. Mariana is building a vertically-integrated minerals company: end-to-end autonomy, speed to market, and lower costs for critical minerals, the inputs every major industry is now short of. who led Valar Atomics' $1B Series B? Valar Atomics raised a $1B Series B led by Sequoia, with Valor Equity Partners, Atreides, Point72, and Conviction, alongside a $200M credit facility led by Erebor and J.P. Morgan. Shaun Maguire of Sequoia joins the board. Valar is building the largest nuclear sites in the world for industrial electricity, heat, and carbon-neutral synthetic fuels. who's in OLIX's $312M Series B? OLIX raised a $312M Series B at a $3.3B valuation, more than tripling its value in six months. the round saw participation from Arm, Fundomo, Hudson River Trading, Netflix co-founder Reed Hastings, and the UK government's Sovereign AI venture fund, with existing investors Plural, Hummingbird Ventures, Phoenix Court, Crane, Creandum, and Transition expanding their commitments. the UK-based company builds the infrastructure for frontier AI: specialised silicon connected by an optical network, unrolling models across racks like an assembly line instead of forcing a single chip to do everything. founder: James Dacombe. who led The Intelligence Company's $7.9M seed? the team of 10 behind DesignArena scaled from $5M to $60M ARR in 6 months, with 5.5M users across 190+ countries: models compete to fulfill real requests, and live user behavior is the benchmark. Mariana Minerals: flagged april 21, announced august 3. 104 days. Valar Atomics: flagged february 16, announced august 3. 168 days. OLIX: flagged may 4, announced august 3. 91 days. The Intelligence Company: flagged february 16, announced august 3. 168 days. the february flag landed on DesignArena, the product account, months before the parent company account existed. same company, same follow graph, receipt intact. this is the part worth reading twice. Valar: between the flag and the round, 12 tracked investors followed the company. Sarah Guo followed july 9; Conviction is in the round announced today. Shaun Maguire followed july 31, three days before he was announced on Valar's board. Mariana: two a16z partners followed in the final four days: one on july 30, and one the morning of the announcement. a16z is in the round. OLIX: flagged may 4 via Frictionless Capital's founder. then a Multicoin Capital partner followed june 26, and Cantos Ventures' founder followed july 29, five days before the announcement. The Intelligence Company: between the february flag and the round, the graph filled in with a Paradigm researcher, a YC general partner (Gustaf Alströmer, july 5; YC is in the round), Andrew Ng, an a16z GP, and finally Sofia Dolfe of Index Ventures, the day before Index led the round. none of that is inside information. it's public follow data, watched account by account, stamped the morning it happens. investors follow companies before they talk about them; the round is visible in the graph while the press release is still a draft. a $1.63B day for the receipt ledger. its receipt ledger has a 7-day minimum lead: a flag has to beat the round by at least a week to count as a discovery rather than a leak of imminent news. at 91 to 168 days, all four of today's rounds clear the bar with months to spare, and all four enter the ledger with sources. these four already raised. the useful list is the one where the round hasn't happened yet. frontrun watches the follow graphs of 1,000+ tracked venture investors on X and flags the companies they converge on, with a date, the morning it happens. every round Frontrun flagged before it was announced, with sources: /fundraises. last month: july 2026. see the signal this article is built on frontrun tracks the follow graphs of 2,000+ venture investors and flags companies months before rounds are announced. companies and founders surfaced on frontrun. curated, every week.
Mariana Minerals has resumed mining operations at the Copper One project in south-eastern Utah, marking the first global site to use autonomous tools across mining, refining and project execution managed by a single operating system. Mariana acquired the 10,000-acre site in late 2025 after purchasing Lisbon Valley Mining Company. Mining had been suspended in late 2024 due to rising costs and worker recruitment challenges, though refinery operations continued. The restart employs MarianaOS, integrating autonomous systems including Pronto's camera-based autonomous haul trucks, Sandvik's remote-controlled drilling, and Boston Dynamics' Spot robots for site patrols. PlantOS optimises refining using real-time data and machine learning. Mariana aims to increase production to 50,000 tonnes per annum of high-purity copper cathode by 2030.
Sandvik supplies autonomous drill rig head to Mariana Minerals' Copper One mine. Sandvik Mining has secured an order to supply a DR410i rotary drill rig, equipped for autonomous operation, to Mariana Minerals' Copper One mine in Utah, USA. The order was booked in 1Q26 and has been delivered to site, with commissioning of AutoMine(R) Surface Drilling ongoing. The project marks the beginning of a collaboration between Sandvik and Mariana Minerals to explore and advance autonomous surface drilling in a next-generation mining environment. In 1Q26, Mariana Minerals also purchased Deswik Mine Planning software for its Copper One mine, expanding its investment with Sandvik to include digital assets. Mariana Minerals is a vertically integrated, software-led mining company focused on the production of critical minerals. At its Copper One site, the company is developing an 'autonomy-first' operation, where equipment and processes are designed to be integrated into MarianaOS, Mariana's internally developed autonomous orchestration platform. As part of this approach, the Sandvik DR410i will be deployed as an autonomous-ready drill, with the rig integrated into MarianaOS using the high-resolution operational and subsurface data to optimise downstream decisions across the mine and processing plan. The Sandvik DR410i is a compact and high-performance rotary blasthole drill rig for surface mining, capable of drilling 152 - 251 mm holes. It features Sandvik's iSeries architecture and DRi system. The latter enables real-time data capture and supporting drill planning, execution, and analysis. With AutoMine(R) Surface Drilling, Sandvik currently offers fully autonomous surface drilling, allowing multiple rigs to operate autonomously from a remote control room. This solution enhances safety by removing personnel from the drill site, while improving consistency, utilisation, and overall productivity. Mats Eriksson, President of Sandvik Mining, said: "This project reflects a shared ambition to advance the role of automation in surface mining. By working closely with Mariana Minerals, we have the opportunity to further develop our autonomous drilling capabilities while supporting a new approach to mine design and operation." Turner Caldwell, CEO of Mariana Minerals, added: "Our vision is to build mining operations where autonomy is embedded from day one. Integrating Sandvik's drill platform into our broader system architecture is an important step towards creating a more connected and adaptive operation at Copper One." Beyond the initial equipment delivery, both companies are working towards continued collaboration as the Copper One project develops and as Mariana Minerals progresses additional projects in North America. Embed article link: (copy the HTML code below):