Before the a16z podcast and the flat-org frameworks and the Elon time discussions, Mariana Minerals did three concrete things: it raised $85 million, it bought a mine, and it started building the first commercial facility in Texas to pull lithium from the water that comes up alongside oil and gas production. That third item is the actual story.
The company is Mariana Minerals, founded and run by Turner Caldwell, who spent roughly a decade at Tesla working on the minerals and metals side of the battery supply chain. On March 27, 2026, Caldwell appeared on an a16z podcast alongside Chandler Luzsicza of Galadyne to discuss what SpaceX and Tesla operating principles look like when applied to hard tech startups. The conversation covered decision velocity, flat organizations, and vertical integration as a binary survival question — familiar territory for anyone who has followed the alumni diaspora from those two companies.
The operating philosophy is real. The Mariana Minerals news is also real, and it predates the podcast by months.
In July 2025, the company closed an $85 million Series A led by a16z, with participation from Breakthrough Energy Ventures and Khosla Ventures, according to the investment announcement on a16z.com. In late 2025, Mariana acquired the Copper One mine in southeastern Utah, a producing copper operation that had been running for over 15 years before the acquisition. Mariana is redesigning it around an autonomy-first model — deploying its MarianaOS software platform to connect geologic modeling, mine planning, fleet orchestration, and plant control under a single automated system, with the goal of reducing the human workforce required underground. The company has said it wants to scale combined output at the site to 50,000 metric tonnes per year by 2030, according to IM-Mining. Bloomberg reported in March 2026 that the mine is on track to reopen in April following the acquisition.
In October 2025, Mariana broke ground on a facility in Joaquin, Texas, that it describes as the state's first commercial produced water lithium extraction operation. The facility is designed to produce up to 3,000 metric tons per year of high-purity lithium salts by extracting lithium from the water that surfaces alongside oil and gas production in the Haynesville shale region. The project leverages Select Water Solutions' existing pipeline infrastructure network, which makes more than 70,000 barrels per day of produced water available at a single collection point.
That facility is the one worth watching.
Produced water is the fluid that comes up alongside oil and gas during extraction. It is plentiful — the Texas oil fields generate billions of barrels annually — and it contains dissolved minerals including lithium in concentrations that have historically been too low to extract economically. Texas has been trying to solve the produced water recycling problem for years. In 2025, the state finalized new rules governing how produced water can be treated and reused, removing one of the main regulatory obstacles that had stalled commercial projects. Mariana's facility is being built in that policy window.
The lithium extraction technology uses adsorption or membrane-based processes to concentrate lithium from the water before conventional refining. Mariana has not disclosed specific recovery rates or process chemistry, which is typical for early-stage projects that have not yet optimized operations. What is clear is the timing: the Texas rule change and the Mariana groundbreaking are separated by months, not years. The company is not inventing the policy environment. It is arriving at the right moment.
Mariana is not the only company pursuing lithium from produced water. Lake Resources, Standard Lithium, and others have been working on various extraction methods from brine sources including produced water. The domestic battery supply chain argument for U.S.-based lithium production has been made since the early 2020s, particularly as downstream battery manufacturing has scaled faster than upstream raw material supply. What Mariana adds to that picture is a mining company — not a water treatment company — that is explicitly building its business around the intersection of mineral extraction and software-defined operations. Caldwell has said publicly that mining is essentially one long construction project that never ends, and that the data silos between geology, mine planning, maintenance, and processing are the real inefficiency to solve.
Whether the produced water facility works at commercial scale is the open question. The facility broke ground in October 2025; full production timelines have not been disclosed publicly. Mariana has set a target of ten mineral projects in ten years, a pace that would require the company to reach operational status on a new project roughly every twelve months. That target is qualitative ambition at this stage, not a validated execution plan. Mariana is also preparing to raise an additional $50 million to $100 million at a $700 million pre-money valuation in summer 2026, Axios reported in March.
The podcast framing — SpaceX velocity applied to mining — is how Mariana presents itself to investors and recruits. The produced water lithium facility is what it is actually building in the near term. The gap between those two things is where the story lives. Caldwell spent years at Tesla watching the battery supply chain try to keep up with production ramp. The lithium his former colleagues needed was coming from wherever it could. Mariana is a bet that the next round of supply will come from places where the water is already being managed anyway, and that the company that figures out how to extract it at scale will have a structural advantage in a market that is not getting less constrained.
Mariana is still early. The Copper One mine retrofit is underway. The produced water facility is under construction. The software-defined mining model has not yet been proven at commercial scale anywhere. But the company has capital, a specific technical target, a regulatory tailwind in Texas, and a founder who knows exactly which part of the battery supply chain he is trying to fix. That is more than most startups in this space have when they show up on a podcast.
