Mariana Minerals
Summary active Updated Aug 3, 2026This profile is AI-generated. If you spot an error, please help us fix it by sharing a URL to the correct information.
Investors
Founders
About
Mariana Minerals is a San Francisco-based, software-first vertically integrated critical minerals company that designs, constructs, and operates mines and refineries using its proprietary MarianaOS platform 12. The system integrates capital project execution, refinery operations, and mine management through AI and machine learning, targeting a roughly 50% reduction in typical 5-10 year mining project timelines 1. The company operates Copper One in Utah (restarted 2025, targeting 50,000 metric tons annual production) and Lithium One in Texas (commercial production expected 2027), with a stated goal of developing 10 mineral projects over 10 years 23. Founder Turner Caldwell previously led Tesla’s metals and minerals team; CTO Juan Lozano scaled ML systems at Affirm and Kite; CFO Baker Tilney founded and scaled an integrated energy company 3.
Disclaimer: This is a lean profile built from initial round coverage and may be expanded as more information becomes available.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2026-08-03 | Series B | $310M | Khosla Ventures | Andreessen Horowitz, Breakthrough Energy Ventures, Greenoaks, Halo Fund, Pax Ventures, StepStone Group, BHP Ventures, Washington Harbour Partners, Greycroft, Mitsubishi Corporation, In-Q-Tel, Earthshot Ventures 12 |
The Series B valued Mariana Minerals at $1.5 billion; total capital raised across parent and project financing stands at approximately $400 million 12.
What Investors Say
No independently sourced investor commentary beyond press-release attribution at this time.
What Founders Say
“We’re architecting our software to be as generalizable as possible for all the metals the modern economy depends on.”
— Turner Caldwell, Co-Founder and CEO of Mariana Minerals, quoted in Fortune coverage of the Series B 2
Sources
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PR Newswire, “Mariana Minerals Raises $310 Million Series B Led by Khosla Ventures to Accelerate Critical Minerals Production,” August 3, 2026. Accessed August 2026. https://www.prnewswire.com/news-releases/mariana-minerals-raises-310-million-series-b-led-by-khosla-ventures-to-accelerate-critical-minerals-production-302840889.html↩↩↩↩
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Fortune, “Khosla leads $310 million raise for unicorn mining startup Mariana Minerals,” August 3, 2026. Accessed August 2026. https://fortune.com/2026/08/03/power-ai-khosla-a16z-bet-startup-reinvent-mining-mariana-minerals/↩↩↩↩↩
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Andreessen Horowitz, “Investing in Mariana Minerals,” July 21, 2025. Accessed August 2026. https://a16z.com/announcement/investing-in-mariana-minerals/↩↩