Silver Bow Mining Corp. Initiates Chief Joseph Portal and Underground Decline Rehabilitation
BUTTE, MONTANA — May 12, 2026 — Silver Bow Mining Corp. (NYSE American: SBMT) (“Silver Bow Mining” or the “Company”) announced today that it signed a contract with MES Mining — a division of Mining & Environmental Services LLC (“MES”), a U.S.-based engineering and construction firm specializing in underground mining. Under the contract with MES, the Company will rehabilitate and modernize the existing Chief Joseph portal and underground decline, to enable the restart of underground exploration activities in Butte, Montana.
The Chief Joseph portal is located on private land at the eastern end of the Company’s Rainbow Block. This work will support underground exploration from both existing and new underground drill platforms. MES is preparing to mobilize and expects to begin delivering equipment and materials to Butte before the end of May with rehabilitation work anticipated to begin in June.
The rehabilitation work is focused on restoring safe access to historical underground workings, enabling additional exploration from underground drill stations to complement its ongoing surface exploration efforts on the Rainbow Block. All activities are fully permitted and bonded under Exploration License #00857, Amendment 1, issued by the Montana Department of Environmental Quality.
About Silver Bow Mining Corp.
Silver Bow Mining Corp. is a minerals exploration company advancing the Butte Mining District of Montana, targeting a broad suite of U.S.-designated Critical Minerals — including silver, copper, zinc, lead, manganese, germanium, gallium, antimony, bismuth, and indium — alongside gold. The Company holds approximately 4,193 acres of patented mineral claims and approximately 1,410 acres of surface lands across multiple claim blocks in this historically prolific district, including the flagship Rainbow Block.
Forward-Looking Statements
This news release contains forward-looking statements within the meaning of the U.S. Securities Act of 1933, as amended, the U.S. Securities Exchange Act of 1934, as amended, and forward-looking information within the meaning of applicable Canadian securities laws. All statements, other than statements of historical fact, that address activities, events or developments the Company expects or anticipates will or may occur in the future are forward-looking statements. Such statements involve known and unknown risks, uncertainties and other factors that may cause actual results to differ materially. Additional risk factors are discussed under the headings “Forward-Looking Statements” and “Risk Factors” in the Company’s Registration Statement on Form S-1, as amended, filed with the U.S. Securities and Exchange Commission on April 24, 2026, the Company’s Canadian prospectus dated April 29, 2026, filed on SEDAR+, and in other documents filed with securities regulators. Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date of the applicable release. Except as required by law, the Company undertakes no obligation to update forward-looking statements.