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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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Form 6-K

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REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR

15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

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For the month of August 2026

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Commission File Number 001-35297

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Fortuna Mining Corp.

(Translation of registrant’s name into English)

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1111 Melville Street, Suite 820, Vancouver, British Columbia, Canada V6E 3V6

(Address of principal executive office)

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Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

FORM 20-F   ¨FORM 40-F  þ

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SIGNATURES

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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Date: August 5, 2026

Fortuna Mining Corp.

(Registrant)

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By:  /s/  "Jorge Ganoza Durant"

  ​ ​ ​ ​ ​ ​ ​ ​ ​ ​Jorge Ganoza Durant

  ​ ​ ​ ​ ​ ​ ​ ​ ​ ​President and CEO

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Exhibits:

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99.1

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Interim Financial Statements for the period ended June 30, 2026

99.2

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Management’s Discussion and Analysis for the period ended June 30, 2026

99.3

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CEO Certification

99.4

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CFO Certification

99.5

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News release dated August 5, 2026

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