Sunshine Silver Mining & Refining Company filed a Form 8-K with the SEC on September 21, 2026, disclosing via Regulation FD a press release announcing an expansion of its Silver Valley land position and the initiation of a district-scale multi-year exploration program.

Key Highlights

  • Land expansion announced: The company disclosed an expansion of its Silver Valley land position, according to the filing.
  • Exploration program initiated: The filing states a district-scale multi-year exploration program has been initiated.
  • Disclosure date: The press release was issued on September 21, 2026.
  • Emerging growth company: The registrant indicated it qualifies as an emerging growth company under applicable SEC rules.
  • Filing signed by: Michelle Shepston, General Counsel, signed the report on September 21, 2026.

Sunshine Silver Mining Discloses Silver Valley Expansion and Exploration Launch

Sunshine Silver Mining & Refining Company (NYSE:SSMR), headquartered at 2209 Big Creek Rd, Kellogg, Idaho 83837, filed a current report on September 21, 2026 under Item 7.01 (Regulation FD Disclosure). According to the filing, the company issued a press release on that date announcing the expansion of its Silver Valley land position and the initiation of a district-scale multi-year exploration program. The press release was furnished as Exhibit 99.1 to the report.

The filing specifies that the information contained in the report and in Exhibit 99.1 "shall not be deemed 'filed' for purposes of Section 18 of the Securities Exchange Act of 1934, as amended." The company further stated the information is not incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act. No financial figures or specific acreage details were included in the body of the 8-K itself; those details, if any, would be contained in the attached press release exhibit.

The registrant is incorporated in Delaware, carries Commission File Number 001-43325, and holds IRS Employer Identification No. 85-3794822. The company indicated it has not elected to use the extended transition period for complying with new or revised financial accounting standards, as noted on the cover page of the filing.

What Was Disclosed

The 8-K disclosed, via Regulation FD, that Sunshine Silver Mining & Refining Company announced a Silver Valley land expansion and the start of a district-scale multi-year exploration program. The substantive details were furnished in an attached press release, Exhibit 99.1, dated September 21, 2026.