Silver Bow Mining Reports Initial Assay Results From Drill Program

Silver Bow Mining Reports Initial Assay Results From Drill Program BUTTE, Mont.--( BUSINESS WIRE)--Silver Bow Mining Corp. (NYSE American: SBMT) (“Silver Bow Mining” or the “Company”) announced today the assay results from the first two drill holes of its 25,000-foot surface diamond drilling program at the Rainbow Block Project in Butte, Montana.

First Drill Results Confirm Significant Critical Minerals Enrichment and Vein Extensions Well Beyond Current Inferred Mineral Resource Estimate.

Drill holes SBM26-01 and SBM26-02 comprise approximately 2,065 feet of diamond core drilling conducted above the water table. The results represent significant step outs from the existing inferred Mineral Resource Estimate as detailed in the Company’s S-K 1300 Technical Report Summary released May 2025 and updated February 2026. Drill hole SBM26-01 intersected mineralization from 640 to 1,980 feet beyond the current inferred Resource boundary along strike, while SBM26-02 extended from 930 to 2,270 feet beyond the boundary. Multiple veins intercepted in both holes lie entirely outside the current inferred Mineral Resource Estimate footprint, and in some cases, represent new veins which were previously unknown.

Highlights

Table 1. Imperial unit drill intercept summary showing the distance along strike to the nearest inferred Mineral Resource Estimate boundary on each vein. N/A indicates a previously unknown vein; opt = troy ounces per ton.

Hole

Vein Name

From

Interval

Distance

opt

ppm

to MRE (ft)

PRECIOUS METAL ENRICHED INTERVALS

SBM26-01

Silver City

24.0

31.0

7.0

16.10

0.012

0.11

0.79

0.07

N/A

SBM26-01

Edith May

696.5

702.0

5.5

11.00

0.025

3.67

1.78

0.08

640

SBM26-02

Auraria

477.8

479.8

2.0

10.88

0.011

0.22

0.15

0.03

2,270

SBM26-01

Auraria

382.9

385.9

3.0

8.30

0.01

0.67

0.31

0.04

1,980

SBM26-02

Unnamed

237.2

241.0

3.8

7.85

0.007

1.27

0.48

0.02

N/A

SBM26-02

Edith May

421.4

425.1

3.7

3.30

0.015

0.01

0.02

0.04

930

BASE METAL ENRICHED INTERVALS

SBM26-01

Badger

829.8

841.7

11.9

3.00

0.007

11.23

4.84

9.38

1,175

SBM26-02

Badger

695.7

699.5

3.8

1.58

0.027

7.90

1.00

86.7

1,590

SBM26-01

Unnamed

1109.2

1111.7

2.5

0.35

0.001

5.32

0.78

14.9

N/A

SBM26-01

Unnamed

909.0

915.2

6.2

2.90

0.007

3.78

1.73

1.61

N/A

SBM26-02

North Edith May

517.1

519.6

2.5

1.25

0.006

3.54

1.61

0.24

955

SBM26-01

North Badger

934.0

949.0

15.0

3.60

0.011

2.13

0.98

1.55

N/A

SBM26-02

Unnamed

742.5

745.0

2.5

5.13

0.019

0.07

0.05

0.203

N/A

Table 2. Metric unit drill intercept summary showing the distance along strike to the nearest inferred Mineral Resource Estimate boundary on each vein. N/A indicates a previously unknown vein; g/t = grams per metric tonne.

Hole

Vein Name

From

Interval

Distance

g/t

ppm

to MRE (m)

PRECIOUS METAL ENRICHED INTERVALS

SBM26-01

Silver City

7.3

9.5

2.2

552.0

0.411

0.11

0.79

0.07

N/A

SBM26-01

Edith May

212.3

214.0

1.7

377.2

0.857

3.67

1.78

0.08

195.1

SBM26-02

Auraria

145.6

146.2

0.6

373.0

0.377

0.22

0.15

0.03

691.9

SBM26-01

Auraria

116.7

117.6

0.9

284.6

0.343

0.67

0.31

0.04

603.5

SBM26-02

Unnamed

72.3

73.5

1.2

269.2

0.24

1.27

0.48

0.02

N/A

SBM26-02

Edith May

128.4

129.6

1.2

113.1

0.514

0.01

0.02

0.04

283.5

BASE METAL ENRICHED INTERVALS

SBM26-01

Badger

252.9

256.6

3.7

102.9

0.24

11.23

4.84

9.38

358.1

SBM26-02

Badger

212.1

213.2

1.1

54.2

0.926

7.9

1.00

86.7

484.6

SBM26-01

Unnamed

338.1

338.9

0.8

12.0

0.034

5.32

0.78

14.9

N/A

SBM26-01

Unnamed

277.1

279.0

1.9

99.4

0.24

3.78

1.73

1.61

N/A

SBM26-02

North Edith May

157.6

158.4

0.8

42.9

0.206

3.54

1.61

0.24

291.1

SBM26-01

North Badger

284.7

289.3

4.6

123.4

0.377

2.13

0.98

1.55

N/A

SBM26-02

Unnamed

226.3

227.1

0.8

175.9

0.651

0.07

0.05

0.203

N/A

All the reported metals are U.S. government-designated Critical Minerals. Silver, zinc, indium, and lead are featured on the USGS Critical Minerals list, while gold has been designated a Critical Mineral via presidential Executive Order. True widths are estimated at 53-73% of the reported interval widths in SBM26-01 and 60-80% of the reported interval widths in SBM26-02. The results represent intervals greater than the cutoff grade used to calculate the inferred Mineral Resource Estimate in the Company’s S-K 1300 Technical Report Summary released May 2025 and updated February 2026.

"The results from SBM26-01 and SBM26-02 strongly validate our geological model for the Rainbow Block vein system," said Phillip Nickerson, Vice President of Exploration. "Our targeting combines our geologic team’s analysis of over 100 years of historical data with proprietary AI optimization technology from Material Difference to target maximum resource addition per foot of drilling. The holes successfully intercepted multiple modeled veins well outside our current inferred Mineral Resource Estimate, with grades exceeding those of our inferred Mineral Resource Estimate ( 11.48M tons @ 4.28 oz/ton Ag, 0.05 oz/ton Au, 1.25% Pb, and 4.59% Zn). Notable intercepts include 7.0 feet grading 16.1 oz/t silver in the Silver City Vein, 11.9 feet of 11.23% zinc with 9.38 ppm indium in the Badger Vein, and 3.8 feet of 7.9% Zn and 86.7 ppm indium also in the Badger Vein. These results demonstrate strong precious and base metal enrichment, with indium which potentially adds significant technical and economic upside to the project."

Travis Naugle, Chairman and CEO, stated: “We believe that these strong results represent a major validation of our geological model and significantly de-risk our expansion strategy at the Rainbow Block. These intercepts not only confirm the lateral extension of multiple modeled veins well beyond the current inferred Mineral Resource Estimate but also identify previously unmodeled veins. Importantly, these results highlight the substantial potential to grow our domestic supply of U.S. Government-designated Critical Minerals - silver, zinc, lead, indium, and others essential for semiconductors, photovoltaics, and defense. Buoyed by these early successes, we have immediately mobilized two additional surface diamond drill rigs to accelerate resource expansion along strike.”

These results represent the first set of assays received from the ongoing surface drill campaign. The Company intends to provide regular updates as further drill hole assay results become available.

The Company’s 25,000-foot drilling campaign is expected to continue through 2026 and is regulated by the Montana Department of Environmental Quality pursuant to Exploration License No. 00857.

Table 3. Drill hole orientation and collar location. Coordinates are in WGS84 UTM 12N.

Hole ID

Azimuth

Inclination

Easting

Northing

Elevation (ft)

Length (ft)

SBM26-01

003

-51

381,857

5,098,519

6,330

1,164

SBM26-02

055

-45

381,854

5,098,520

6,330

905

Technical Information

All drilling and sampling were conducted under the supervision of qualified personnel. Samples were submitted to ALS Global in Elko, NV, an independent analytical laboratory, and analyzed using standard industry methods. Quality assurance and quality control procedures include the insertion of blanks, standards, and duplicates at regular intervals.

Qualified Person

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” within the meaning of National Instrument 43-101 – Standards of Disclosure for Mineral Projects. Dr. Nickerson has verified the data disclosed, including the sampling, analytic and test data underlying the disclosure, through visits to drill sites, oversight of sample preparation protocols and review of the QA/QC procedures applied to analytical results received from ALS Global. No limitations or failures to verify were identified that could materially affect the results.

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, 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. These forward-looking statements and forward-looking information include, but are not limited to statements regarding the Company’s exploration plans and activities at the Rainbow Block Project; the ongoing 25,000-foot surface drilling program the timing, scope and results of future drilling and assay results; additional drill rig mobilization and increased drilling capacity; geological modeling, interpretation and continuity of mineralized vein systems; the potential for resource expansion, including along strike, at depth and above the water table, and to increase or update the Company’s Mineral Resource Estimate; the Company’s continued exploration activities targeting U.S.-designated Critical Minerals, including the presence, grade, continuity, recoverability and economic significance of silver, zinc, lead, indium, gold and other U.S.-designated Critical Minerals; the potential technical or economic upside of the project; and expectations regarding future permitting, regulatory approvals, and project advancement; and the Company’s ability to raise capital and continue its exploration activities.

When used in this news release or elsewhere, the 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 statements are based on the Company’s current expectations, estimates, assumptions and beliefs as of the date of this news release, including assumptions regarding the availability of personnel, equipment, permits, services and financing; the accuracy of geological models and historical data; the reliability of sampling, analytical and quality assurance/quality control procedures; continuity of mineralization; commodity prices; regulatory requirements; and general business, market and economic conditions.

These statements involve known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements of the Company to differ materially from those expressed or implied by such statements. Such factors include, among others, uncertainty of resource estimates, risks that exploration activities may not result in the definition of mineral resources or support further technical or economic studies; risks that drilling, sampling, metallurgical testing or geological interpretations may not produce the results currently anticipated by management; uncertainty regarding the presence, grade, continuity, recoverability or economic significance of critical minerals, including critical minerals such as copper, manganese, germanium, gallium, indium, antimony and bismuth; uncertainty as to 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 Butte, Montana; risks related to the Company’s mineral claims, including the validity, title and maintenance of mineral claims and property rights; risks relating to cost increases for capital and operating costs; risks of shortages and fluctuating costs of equipment or supplies, labor and services; risks relating to fluctuations in the price of commodities and market conditions; risks in obtaining maintaining or amending permits, licenses and future permitting and regulatory approvals, including matters relating to Exploration License No. 00857; risks of delays resulting in timelines disclosed in this news release not being met; risks relating to reliance on key personnel and third-party contractors and consultants; the risk that the Rainbow Block project may not advance beyond the exploration stage or be developed into a commercially viable mining operation; 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.