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Startup · United States

Mariana Minerals

HQ San Francisco, CAFounded 202451-200 employees

AI-driven mining and mineral refining company.

Startup
Website
Total raised
~$384M
2 rounds
Last round
$310M
Series B · Aug 3, 2026
Mentions
2
Latest Aug 3, 2026

News2

Open in the news feed →

Funding2 rounds · ~$384M

Equity raised
~$384M
Latest
$310MSeries B · Aug 3, 2026
Last valuation
$1.50B?Basis not stated · Series B · Aug 3, 2026
Cumulative raised$384M
Jul 21, 2025Aug 3, 2026
Valuation over time$1.50B · Aug 3, 2026
Valuation over timeReported valuation rose from $278M (Jul 21, 2025) to $1.50B (Aug 3, 2026) across 2 valued rounds. 1 post-money, 1 without a stated pre/post basis.
Valuations by round
AnnouncedStageValuationBasis
Jul 21, 2025Series A$278MPost-money
Aug 3, 2026Series B$1.50BBasis not stated

Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.

Supply Chain4 facilities

Facilities4

  • Mariana Minerals headquarters
    Headquarters · San Francisco, CA, United States
    Operating
    Confirmed
  • Copper One Mine
    Mine · Utah, United States
    Operating · 2026
    Reported
  • Lithium One
    Other · TX, United States
    Operating
    Reported
  • Mariana Minerals Houston engineering office
    Office · Houston, TX, United States
    Operating
    Confirmed

People6

All 6 people →

Hiring Observations10 observed listings

View all 82 listings →

A sample of observed listings, not a total vacancy count. Availability may have changed since collection. Categories are inferred from job titles.

Company Metrics

LinkedIn employee profiles
211
Observed Oct 11, 2026
Bright Data / LinkedIn · Source ↗
LinkedIn followers
12,718
Observed Oct 11, 2026
Bright Data / LinkedIn · Source ↗

Employee-profile counts reflect LinkedIn profiles associated with the company, not verified headcount. One observation establishes a baseline; it does not establish growth.

Sources17

Show all 17 sources and supporting evidence

Profile2

  1. 1
    CompanyMariana Minerals

    Mariana Minerals · Supports Organization · name

    “Mariana Minerals”
  2. 2
    DatabaseMariana Minerals - Crunchbase company profile

    Crunchbase · Supports Organization · status

    “operating_status: active”

Funding8

  1. 3
    Regulatory filingMariana Minerals Co. - SEC Form D (0002123886-26-000004)

    U.S. Securities and Exchange Commission · Aug 6, 2026 · Supports Funding round

    “Total Amount Sold $310,499,477 USD”
  2. 4
    NewsMariana Minerals Raises $310M Series B

    Tectonic · Aug 4, 2026 · Supports Funding round

    “New investors 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”
  3. 5
    CompanyMariana Minerals Raises $310 Million Series B Led by Khosla Ventures to Accelerate Critical Minerals Production

    PR Newswire (Yahoo Finance) · Aug 3, 2026 · Supports Funding round · amount, Funding round · announced on

    “Mariana Minerals Raises $310 Million Series B Led by Khosla Ventures”
  4. 6
    NewsTo power AI, Khosla and a16z bet this startup can reinvent mining

    Fortune · Aug 3, 2026 · Supports Facility, Funding round · post money valuation usd

    “the mines that Mariana runs: Copper One in Utah and Lithium One in Texas”
  5. 7
    Regulatory filingMariana Minerals Co. - SEC Form D (0002123886-26-000001)

    U.S. Securities and Exchange Commission · Apr 7, 2026 · Supports Funding round · amount

    “Total Amount Sold $73,529,982 USD”
  6. 8
    DatabaseMariana Minerals - Forge company profile

    Forge Global · Jul 21, 2025 · Supports Funding round · post money valuation usd

    “07/21/2025 Series A-1 $65.7M $11.25 $278.31M”
  7. 9
    CompanySeries A Announcement

    Mariana Minerals · Jul 21, 2025 · Supports Funding round

    “led by a16z, with continued support from seed investors Breakthrough Energy Ventures and Khosla Ventures”
  8. 10
    NewsMariana Minerals Raises $310M Series B

    Tectonic · Supports Funding round · amount, Organization

    “AI-powered mining and refining company Mariana Minerals announced that it's raised a $310M Series B led by Khosla Ventures, bringing total funding to about $400M.”

Supply chain3

  1. 11
    NewsMariana Minerals starts its copper mine

    Mining Magazine · Apr 28, 2026 · Supports Facility

    “Silicon Valley-backed Mariana Minerals has restarted the Utah copper mine Copper One, formerly known as Lisbon Valley, as an autonomous-first producer of the red metal.”
  2. 12
    NewsLisbon Valley Copper Mine reopens

    San Juan Record · Apr 28, 2026 · Supports Facility

    “Local, state, and federal officials gathered in Lisbon Valley to celebrate the reopening of the Copper One Mine, marking a significant step forward for economic growth and job creation in the area.”
  3. 13
    CompanyMariana Minerals

    Mariana Minerals · Supports Facility, Organization · website

    “Houston Engineering Office”

People2

  1. 14
    CompanyAbout | Mariana Minerals

    Mariana Minerals · Supports Role

    “General Counsel”
  2. 15
    OtherBlack Flag 100.2

    Black Flag · Supports Organization, Role

    “Mariana Minerals is a software-first critical minerals company using AI and automation to unify mining, refining, and capital execution on one platform. As”

Other2

  1. 16
    CompanyMariana Minerals public job board

    Supports Job posting

    “Custodian/General Labor”
  2. 17
    CompanyMariana Minerals

    LinkedIn · Supports Organization · country, Organization · employee range, Organization · hq city, Organization metric · employees in linkedin, Organization metric · followers

    “**Address:** San Francisco, CA 94107, US”

Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.