The Numbers Come First
Mariana Minerals, a San Francisco-based mining startup, has closed a $310 million Series B led by Khosla Ventures, with participation from Andreessen Horowitz, Breakthrough Energy Ventures, Greenoaks, Halo Fund, Pax Ventures, StepStone Group, BHP Ventures, Washington Harbour Partners, Greycroft, Mitsubishi Corporation, and others. The round brings the company's total capital raised to $400 million and its valuation to $1.5 billion, according to Fortune.
The company was cofounded in 2024 by Turner Caldwell, Baker Tilney, and Juan Lozano. Caldwell spent nine years working on factory design and construction at Tesla before launching Mariana.
Two Mines, One Software Backbone
Mariana currently operates two sites. Copper One, a previously idled copper mine in Utah acquired in 2025, was restarted over four months using autonomous software. The company says the site is moving toward producing 50,000 metric tons of refined copper per year. Lithium One, which broke ground in Texas in 2025, is expected to enter commercial production in 2027.
The company's pitch is straightforward: apply a generalizable software platform across every metal the modern economy depends on — copper, lithium, aluminum, magnesium, nickel, cobalt, manganese, uranium, and rare earths.
'Our goal is to reduce the cost of these core inputs to the modern economy over time,' Caldwell said. 'That enables us to ensure that everything downstream can move as fast as humanly possible.'
The Geopolitical Stakes
The funding lands at a moment of acute strategic pressure. China dominates global mining and controls as much as 90% of critical minerals processing worldwide, according to the source. For rare earth magnets manufacturing — essential for smartphones and defense applications — that figure reaches 92%. The result is what the article describes as a 'critical minerals chokehold' on the United States, built through decades of Chinese industrial policy and American industrial decline.
Travis Kalanick, former founder of Uber and current head of physical AI and robotics company Atoms, put it plainly: 'You cannot lead in the AI century without a domestic supply chain.'
Copper is the immediate chokepoint. AI-built data centers are placing unprecedented demand on America's electrical grid, and volatile copper prices alone, as Caldwell argues, stall the country's industrial future.
'If you look at the modern economy, it's basically an electrification story,' Caldwell said. 'That's true whether it's AI infrastructure, renewables and energy storage applications, the reindustrialization initiative, or the electrification of transport — land, air, and sea.'
What This Means
For too long, Washington and Wall Street treated mining as a legacy industry — slow, dirty, and someone else's problem. China made it a strategic weapon. Mariana Minerals represents exactly the kind of private-capital response that a free-market economy should produce: no federal mandate required, just venture dollars chasing a real problem with real consequences.
The market has already voted. A $1.5 billion valuation for a two-year-old mining startup signals that sophisticated capital understands what the administrative state has been slow to grasp — that semiconductors, data centers, and the entire AI buildout sit downstream of a shovel in the ground. Whoever controls the metals controls the century. Right now, that is Beijing. Mariana is betting it does not have to stay that way.
