Mariana Minerals

Mariana Minerals announced $310M in Series B financing on August 3, 2026. Mariana Minerals raised a $310 million Series B led by Khosla Ventures to build out its critical minerals project portfolio, including Copper One and Lithium One.

Round details

The financing includes backing from Khosla Ventures, Andreessen Horowitz (a16z), Breakthrough Energy Ventures, Greenoaks, BHP Ventures, Mitsubishi Corporation, In-Q-Tel (IQT), StepStone Group. The company did not publish a valuation with the announcement.

• Round: Series B
• Capital announced: $310M
• Total funding reported: Approx. $400M (parent and project capital)

How the company plans to use the capital

Mariana Minerals said the Series B will fund continued buildout of its active project portfolio, including its Copper One site in Southeastern Utah and Lithium One site in East Texas. The company said the financing accelerates its goal of developing 10 commercial-scale projects in 10 years.

Why this matters for GTM teams

The release describes Mariana Minerals as a software-first, vertically integrated critical minerals company, and says the round brings its total parent and project capital raised to date to approximately $400 million.

Fresh capital is often an operational signal rather than a buying signal by itself. Teams should validate the company’s hiring pattern, product launches, geographic expansion, and technology priorities before choosing the message and timing of outreach.

Source and methodology

This report is based on the company’s announcement and records the disclosed amount, round, investors, location, and stated use of funds. SalesTools Research does not estimate undisclosed valuation or revenue figures.

Primary source: Mariana Minerals Series B announcement.