Silver Bow Mining Corp. (NYSE American: SBMT) (“Silver Bow Mining” or the “Company”) is pleased to announce assay results from drill holes SBM26-03 and SBM26-04 from its ongoing 25,000-foot diamond drilling program at the Rainbow Block Project in Butte, Montana.

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Highlights

  • SBM26-03 – Badger Vein: 4.0 m grading 994.2 g/t silver equivalent (“AgEq”) (309.0 g/t Ag, 1.85 g/t Au, 9.98% Zn, 5.75% Pb).

  • including 2.3 m grading 1,586.1 g/t AgEq (455.0 g/t Ag, 2.76 g/t Au, 17.13% Zn, 9.71% Pb).

  • SBM26-04 – Jessie Vein: 2.0 m grading 693.1 g/t AgEq (61.6 g/t Ag, 0.17 g/t Au, 13.77% Zn, 4.83% Pb).

  • SBM26-04 – State Vein: 1.6 m grading 502.0 g/t AgEq (103.8 g/t Ag, 0.31 g/t Au, 8.19% Zn, 2.96% Pb).

  • Three surface drill rigs are operating at the Rainbow Block with approximately 13,500 feet of the previously announced 25,000-foot Phase I diamond drill program now complete.

The results from SBM26-03 and SBM26-04 follow the Company’s June 22, 2026 drill results and provide additional evidence of high-grade polymetallic mineralization within the Badger Vein. The Badger Vein intercept from SBM26-03 is located approximately 125 meters (400 feet) beyond the boundary of the current Inferred Mineral Resource estimate (“MRE”) and approximately 125 meters from the Badger Vein intercept in SBM26-01, which returned 3.7 meters (“m”) grading 651.0 g/t AgEq (102.9 g/t Ag, 0.24 g/t Au, 11.23% Zn and 4.84% Pb).

The locations of the four Badger Vein drill-hole intercepts relative to the current MRE, historical mine workings and the interpreted Badger-State vein system are shown in Figure 1. Tables 1 and 2 provide assay highlights from SBM26-03 and SBM26-04.

Current Rainbow Block Mineral Resource and Exploration Program

Silver Bow Mining’s Rainbow Block hosts an Inferred Mineral Resource of 10.4 million tonnes grading 507.4 g/t AgEq (146.7 g/t Ag, 1.7 g/t Au, 4.59% Zn, and 1.25% Pb) containing 49.16 million ounces silver, 0.55 million ounces gold, 0.47 million tonnes zinc, and 0.13 million tonnes lead.

The Company’s current diamond drilling program is designed to test the extent of mineralization outside the current MRE and support potential expansion of the Rainbow Block mineral resource. None of the reported mineralized intercepts from the current drill program are located within the boundaries of the current MRE.

Silver Bow Mining plans to complete an updated MRE for the Rainbow Block in the first half of 2027. The planned update is expected to incorporate results from the Company’s current drilling program together with historical assay information from drilling and underground sampling conducted by previous operators, subject to completion of the necessary compilation, validation and verification of such historical information.

“The 4-meter intercept in SBM26-03 grading 994.2 g/t AgEq, including a 2.3-meter core at 1,586.1 g/t AgEq, is the strongest interval we have drilled to date at the Rainbow Block,” said Phillip Nickerson, PhD, CPG, Vice President of Exploration. “Beyond the grades themselves, what stands out is that this intercept sits approximately 125 meters, or 400 feet, west of the high-grade intersection in our first hole of the season, SBM26-01, which returned 651.0 g/t AgEq over 3.7 meters. These results provide further evidence of potential high-grade mineralization not only along the Badger Vein, but also across several sub-parallel vein systems, and support our continued work to expand the current resource estimate. We believe we are still in the early stages of characterizing the scale and extent of the mineralized system at the Rainbow Block.”

“These results continue what we believe is a strong start to the 2026 drilling program at the Rainbow Block,” said Travis Naugle, Chairman and CEO. “With three surface drill rigs operating, we are focused on building the body of technical data needed to evaluate the broader potential of the numerous Rainbow Block vein systems and support an updated Mineral Resource estimate in the first half of 2027. The combination of high-grade silver with significant zinc and lead mineralization is a key attribute of the Rainbow Block and is particularly important given the growing strategic importance of these Critical Minerals to the United States. As our Phase I drilling continues and we prepare to advance our exploration program from underground locations, our focus is on systematically testing the broader mineralized system on the Rainbow Block and building the technical foundation to further define its scale and growth potential.”

Additional Drill Intersections

In addition to the high-grade Badger Vein intercept, SBM26-03 intersected mineralization interpreted as the Unnamed Vein, North Edith May Vein and North Badger Vein, all outside the current MRE.

SBM26-04 intersected multiple mineralized veins outside the current MRE, including the Badger Vein, State Vein, North State Vein, Poser Fault Vein, Jessie Vein and Rainbow Vein. The strongest interval in hole SBM26-04 was from the Jessie Vein, which returned 2.0 meters grading 693.1 g/t AgEq (61.6 g/t Ag, 0.17 g/t Au, 13.77% Zn and 4.83% Pb).

In SBM26-04, poor drilling conditions were encountered from 602.6 to 603.8 meters and no core was recovered from the 1.2-meter interval. This interval of no core recovery was closely followed by a 1.4-meter mineralized intercept from the Rainbow Vein which graded 253.2 g/t AgEq (78.0 g/t Ag, 0.06 g/t Au, 3.60% Zn and 1.60% Pb). Given the poor recovery, the full extent of the Rainbow Vein intersected in SBM26-04 is uncertain.

The Company’s surface drilling campaign is expected to continue through 2026 and is regulated by the Montana Department of Environmental Quality pursuant to Exploration License No. 00857.

Badger Vein

The Badger Vein lies adjacent to the historic Badger Shaft and was historically mined between the 1,200- and 2,200-foot levels, below the current water table. A review of the extensive historical geological information available to the Company indicated that west of the shaft, the Badger Vein was offset by a fault and continued west, merging with the State Vein as illustrated in Figure 1. Silver Bow Mining’s Phase I drilling has now confirmed the westerly extension of the Badger Vein.

The Company continues to use historical geological and mining information to target extensions of known vein systems across the Rainbow Block.

Technical Disclosure

Mineral Resource Estimate: The Company’s current Inferred Mineral Resource for the Rainbow Block is disclosed in the Technical Report Summary prepared in accordance with the requirements of Subpart 1300 of Regulation S-K titled, Technical Report Summary: Rainbow Block, Butte Mining District, Silver Bow County, Montana, USA, and the National Instrument 43-101 – Standards of Disclosure for Mineral Projects technical report titled, Technical Report on the Rainbow Block Property, Butte Mining District, Silver Bow County, Montana, USA, each with an effective date of December 31, 2024 and updated February 3, 2026, prepared by Jacob Anderson, CPG, MAusIMM of Dahrouge Geological Consulting.

Mineral resources are not mineral reserves and do not have demonstrated economic viability. Inferred Mineral Resources have a high degree of geological uncertainty and may not be considered when assessing the economic viability of a mining project or converted to mineral reserves. There is no assurance that any Inferred Mineral Resource will be upgraded to a higher category through continued exploration or that any mineral resource will ultimately be converted to a mineral reserve.

Sample Preparation and Analytical Methods: Diamond drill core was logged, photographed and sampled by Silver Bow personnel at the Company’s Butte core logging facility. Sample intervals were selected based on geologic criteria and ranged from approximately 1 to 5 feet. Core selected for analysis was sawn longitudinally, with one-half submitted for analysis and the remaining one-half retained for reference in Silver Bow Mining secure core storage facilities.

Samples were individually bagged and transported under chain-of-custody procedures by courier to ALS Global (“ALS”) in Elko, Nevada. ALS is independent of Silver Bow Mining. The ALS laboratories used for the analyses reported herein are accredited to ISO/IEC 17025.

Samples were prepared using ALS method PREP-31BY, which includes crushing to 70% passing 2 millimeters, rotary splitting of a 1-kilogram sample, and pulverization to 85% passing 75 microns. Silver and gold were analyzed using ALS method ME-GRA22, consisting of a 50-gram fire assay with a gravimetric finish. Zinc, lead and indium were analyzed using ALS method ME-MS61, consisting of four-acid digestion followed by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma atomic emission spectrometry (ICP-AES). Samples returning values above the upper analytical limits of the primary methods were re-analyzed using appropriate over-limit methods. High-grade silver samples were analyzed using Ag-OG62, and high-grade zinc and lead samples were analyzed using Zn-OG62 and Pb-OG62.

Quality Assurance and Quality Control: Silver Bow Mining maintains a quality assurance and quality control (“QA/QC”) program for its diamond drilling that includes the systematic insertion of blanks and certified reference materials into the sample stream at a combined rate of approximately 10% or one QA/QC sample per 10 samples. ALS Global also performs its own internal laboratory QA/QC procedures.

QA/QC results for SBM26-03 and SBM26-04 were reviewed by the Company’s Qualified Person. Some certified reference materials performed outside the Company’s established acceptance criteria for Au in SBM26-03. Re-assays were performed on the CRM pulps of concern and surrounding samples (±5) to verify result consistency. Re-assays of surrounding samples showed excellent agreement with original results, with no systematic bias. One assay discrepancy was identified (22.7 ppm Au original vs. 1.76 ppm Au re-assay); a review of fire assay and gravimetric records by ALS indicated an isolated carryover event during gravimetric processing as the likely cause, rather than a broader analytical issue. Based on this review, the Qualified Person considers the analytical results reported in this release to be reliable.

Silver Equivalent Calculation: AgEq grades reported in this news release use metal prices and estimated recovery assumptions consistent with the Company’s current MRE. The following metal prices were used: silver – $25.00/oz; gold – $2,500/oz; zinc – $1.31/lb; and lead – $0.90/lb. Estimated metallurgical recoveries of 90% were applied to each metal included in the calculation.

AgEq is calculated by determining the per-ton in-situ value of silver, gold, zinc and lead, applying the respective estimated metallurgical recovery to each metal, summing the resulting values and dividing the total by the silver price adjusted by the estimated silver recovery. Indium is reported separately and is not included in the AgEq calculation.

The metallurgical recovery assumptions used in the AgEq calculation are consistent with those used in the current Rainbow Block resource estimate. Actual metallurgical recoveries have not been established for the specific mineralized intervals reported in this release and may differ from the assumptions used.

Qualified Person and Data Verification: The scientific and technical information contained in this news release has been reviewed and approved by Phillip Nickerson, PhD, CPG, Vice President of Exploration of Silver Bow Mining Corp., who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects of the Canadian Securities Administrators and a “Qualified Person” as defined by Subpart 1300 of Regulation S-K of the U.S. Securities and Exchange Commission.

Dr. Nickerson specifically reviewed the analytical and QA/QC data supporting the drill results reported in this news release and considers the results reliable for the purposes of this disclosure. No limitations on or failures to verify the data were identified that could materially affect the results reported herein.

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 4,210 acres of patented mineral claims and approximately 1,427 acres of surface lands across multiple claim blocks in this historically prolific district, including the flagship Rainbow Block.

On Behalf of Silver Bow Mining Corp.,

Travis Naugle, Chairman and Chief Executive Officer

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, included in this news release that address activities, events or developments that we expect or anticipate will or may occur in the future are forward-looking statements and forward-looking information. When used in this news release or elsewhere, words such as “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “project,” “target,” “will,” “could,” “should,” and similar expressions, or statements that certain actions, events or results “may,” “could,” “would,” “should,” “might” or “will” occur or be achieved, often, but not always, identify forward-looking statements and forward-looking information.

These forward-looking statements and forward-looking information include, but are not limited to, statements regarding the Company’s ongoing 25,000-foot diamond drilling program at the Rainbow Block; the continuation and timing of the Company’s 2026 drilling program; the continued operation of three surface diamond drill rigs; continued exploration and drilling of the Badger-State vein system and other vein systems at the Rainbow Block; the objectives and anticipated results of the Company’s exploration and drilling programs; the potential scale, continuity, extent and quality of mineralization; the potential to extend known mineralized vein systems; the potential expansion of the Rainbow Block Mineral Resource; the Company’s plans and timing for completion of an updated Mineral Resource estimate in the first half of 2027; the potential incorporation into a future Mineral Resource estimate of results from the Company’s current drilling program and historical drilling and underground sampling information; the compilation, validation and verification of such historical information; the potential significance of the Rainbow Block and its mineralization in the context of U.S. critical and strategic minerals policy; and other similar statements regarding the Company’s exploration and development plans for the Rainbow Block.

Forward-looking statements and forward-looking information are based on the Company’s current expectations and are subject to known and unknown risks and uncertainties that may cause actual results to differ materially, including the risk that additional drilling and assay results may not confirm the continuity, grade, extent or quality of mineralization; the risk that drilling may not extend known mineralized vein systems or support an expansion of the current Mineral Resource estimate; uncertainty associated with Mineral Resource estimates, including the high degree of geological uncertainty associated with Inferred Mineral Resources; the risk that Inferred Mineral Resources may not be upgraded to a higher category through continued exploration or ultimately converted to Mineral Reserves; the ability to compile, validate and verify historical drilling, assay and underground sampling information to the standard required for its use in a future Mineral Resource estimate; the timing and completion of the Company’s exploration and drilling programs and an updated Mineral Resource estimate; changes in U.S. laws, regulations, executive orders, policies or government priorities relating to critical and strategic minerals; the Company’s future capital costs, operating costs, non-operating costs, and ability to raise capital on terms acceptable to the Company or at all; risks relating to the Company’s exploration activities in Montana; risks related to the Company’s mineral claims, including the validity, title and maintenance of mineral claims and property rights; risks in obtaining, maintaining or amending permits, licenses and future permitting and regulatory approvals; commodity-price fluctuations; litigation; and the inherently hazardous nature of mining-related activities and other operational and environmental risks inherent in mineral exploration and mining-related activities. 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 by the Company with the U.S. Securities and Exchange Commission and Canadian securities regulatory authorities.

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those described in forward-looking statements and forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on forward-looking statements and forward-looking information, which speak only as of the date of this news release. Except as required by applicable law, the Company undertakes no obligation to update or revise any forward-looking statements or forward-looking information, whether as a result of new information, future events or otherwise.

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