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Mariana Minerals announced a $310 million Series B financing on 2026-08-03, led…

2026-08-03 · 13:58 UTC ·@MarianaMinerals ·1 min read

Brief

Mariana Minerals announced on August 3, 2026 a $310 million Series B led by Khosla Ventures, with continued backing from a16z and Breakthrough Energy and new participation from strategic investors including BHP Ventures, Mitsubishi, and IQT. The company says it will use the funds to build a vertically integrated, end-to-end autonomous mining operation to accelerate speed-to-market and reduce costs amid surging demand for critical minerals.

Why it matters

Mariana Minerals announced a $310 million Series B financing on 2026-08-03, led by Khosla Ventures with continued participation from Andreessen Horowitz (a16z) and Breakthrough Energy Ventures.

Key details

  • New investors include 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; the company says the capital will fund a vertically-integrated, end-to-end autonomous mining business focused on speed to market and lowering costs to meet accelerating critical-minerals demand.
Source evidence

Big news!

We are excited to announce our $310 million Series B financing, led by @khoslaventures, 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.

Demand for critical minerals continues to accelerate across every major industry, and building a vertically-integrated company focused on end-to-end autonomy, speed to market, and lowering costs is the only answer to meet the challenge. Our Series B is another crucial step in building the mining company of the future, today – and we’re not waiting to get started.

Read more: marianaminerals.com/news/ser…

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