Silver Bow Mining Corp.

Silver Bow Mining Corp. Reports Initial Assay Results From Drill Program at Rainbow Block Project

Silver Bow Mining Corp. Reports Initial Assay Results From Drill Program at Rainbow Block Project
NYSE American: SBMT

Overview

Silver Bow Mining Corp. (NYSE American: SBMT) announced 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. According to the company, drill holes SBM26-01 and SBM26-02 comprise approximately 2,065 feet of diamond core drilling conducted above the water table.

The company states that the results represent step outs from the existing inferred Mineral Resource Estimate, as detailed in its 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. According to the company, 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.

Key Highlights

  • Drill holes SBM26-01 and SBM26-02 comprise approximately 2,065 feet of diamond core drilling conducted above the water table as part of the company's 25,000-foot surface diamond drilling program at the Rainbow Block Project in Butte, Montana.
  • SBM26-01 intersected mineralization from 640 to 1,980 feet beyond the current inferred Mineral Resource Estimate boundary along strike; 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; some represent previously unknown veins.
  • Precious metal enriched intervals include: SBM26-01, Silver City vein, 7.0 ft interval (24.0–31.0 ft), 16.10 opt Ag, 0.012 opt Au (previously unknown vein); SBM26-01, Edith May vein, 5.5 ft interval (696.5–702.0 ft), 11.00 opt Ag, 0.025 opt Au, 640 ft from MRE boundary; SBM26-02, Auraria vein, 2.0 ft interval (477.8–479.8 ft), 10.88 opt Ag, 0.011 opt Au, 2,270 ft from MRE boundary; SBM26-01, Auraria vein, 3.0 ft interval (382.9–385.9 ft), 8.30 opt Ag, 0.01 opt Au, 1,980 ft from MRE boundary.
  • Base metal enriched intervals include: SBM26-01, Badger vein, 11.9 ft interval (829.8–841.7 ft), 11.23% Zn, 4.84% Pb, 9.38 ppm In, 3.00 opt Ag, 1,175 ft from MRE boundary; SBM26-02, Badger vein, 3.8 ft interval (695.7–699.5 ft), 7.90% Zn, 1.00% Pb, 86.7 ppm In, 1.58 opt Ag, 1,590 ft from MRE boundary.
  • Additional base metal enriched intervals (previously unknown veins) in SBM26-01 include: Unnamed vein at 1109.2–1111.7 ft (2.5 ft), 5.32% Zn, 0.78% Pb, 14.9 ppm In; Unnamed vein at 909.0–915.2 ft (6.2 ft), 3.78% Zn, 1.73% Pb, 1.61 ppm In; North Badger vein at 934.0–949.0 ft (15.0 ft), 2.13% Zn, 0.98% Pb, 1.55 ppm In.
  • Additional base metal enriched intervals in SBM26-02 include: North Edith May vein at 517.1–519.6 ft (2.5 ft), 3.54% Zn, 1.61% Pb, 0.24 ppm In, 955 ft from MRE boundary; Unnamed vein at 742.5–745.0 ft (2.5 ft), 0.07% Zn, 0.05% Pb, 0.203 ppm In (previously unknown vein); Unnamed vein at 237.2–241.0 ft (3.8 ft), 1.27% Zn, 0.48% Pb, 0.02 ppm In (previously unknown vein).

Strategic and Operational Context

According to the company, the results from the first two drill holes confirm vein extensions well beyond the current inferred Mineral Resource Estimate, as well as the presence of critical minerals enrichment. The company states that these drill holes are part of a 25,000-foot surface diamond drilling program at the Rainbow Block Project. The results are referenced against the company's S-K 1300 Technical Report Summary, originally released in May 2025 and updated in February 2026.

The company notes that the intercepts span both precious metal enriched intervals and base metal enriched intervals across multiple named and previously unknown veins, with distances from the current inferred Mineral Resource Estimate boundary ranging from 640 feet to 2,270 feet along strike.

Drill Intercept Data (Imperial Units, Selected Intervals)

Table 1 Imperial unit drill intercept summary (opt = troy ounces per ton). N/A for Distance to MRE indicates a previously unknown vein.

Precious Metal Enriched Intervals

  • SBM26-01 | Silver City | 24.0–31.0 ft | 7.0 ft | Ag: 16.10 opt | Au: 0.012 opt | Zn: 0.11% | Pb: 0.79% | In: 0.07 ppm | Distance to MRE: N/A
  • SBM26-01 | Edith May | 696.5–702.0 ft | 5.5 ft | Ag: 11.00 opt | Au: 0.025 opt | Zn: 3.67% | Pb: 1.78% | In: 0.08 ppm | Distance to MRE: 640 ft
  • SBM26-02 | Auraria | 477.8–479.8 ft | 2.0 ft | Ag: 10.88 opt | Au: 0.011 opt | Zn: 0.22% | Pb: 0.15% | In: 0.03 ppm | Distance to MRE: 2,270 ft
  • SBM26-01 | Auraria | 382.9–385.9 ft | 3.0 ft | Ag: 8.30 opt | Au: 0.01 opt | Zn: 0.67% | Pb: 0.31% | In: 0.04 ppm | Distance to MRE: 1,980 ft
  • SBM26-02 | Unnamed | 237.2–241.0 ft | 3.8 ft | Ag: 7.85 opt | Au: 0.007 opt | Zn: 1.27% | Pb: 0.48% | In: 0.02 ppm | Distance to MRE: N/A
  • SBM26-02 | Edith May | 421.4–425.1 ft | 3.7 ft | Ag: 3.30 opt | Au: 0.015 opt | Zn: 0.01% | Pb: 0.02% | In: 0.04 ppm | Distance to MRE: 930 ft

Base Metal Enriched Intervals

  • SBM26-01 | Badger | 829.8–841.7 ft | 11.9 ft | Ag: 3.00 opt | Au: 0.007 opt | Zn: 11.23% | Pb: 4.84% | In: 9.38 ppm | Distance to MRE: 1,175 ft
  • SBM26-02 | Badger | 695.7–699.5 ft | 3.8 ft | Ag: 1.58 opt | Au: 0.027 opt | Zn: 7.90% | Pb: 1.00% | In: 86.7 ppm | Distance to MRE: 1,590 ft
  • SBM26-01 | Unnamed | 1109.2–1111.7 ft | 2.5 ft | Ag: 0.35 opt | Au: 0.001 opt | Zn: 5.32% | Pb: 0.78% | In: 14.9 ppm | Distance to MRE: N/A
  • SBM26-01 | Unnamed | 909.0–915.2 ft | 6.2 ft | Ag: 2.90 opt | Au: 0.007 opt | Zn: 3.78% | Pb: 1.73% | In: 1.61 ppm | Distance to MRE: N/A
  • SBM26-02 | North Edith May | 517.1–519.6 ft | 2.5 ft | Ag: 1.25 opt | Au: 0.006 opt | Zn: 3.54% | Pb: 1.61% | In: 0.24 ppm | Distance to MRE: 955 ft
  • SBM26-01 | North Badger | 934.0–949.0 ft | 15.0 ft | Ag: 3.60 opt | Au: 0.011 opt | Zn: 2.13% | Pb: 0.98% | In: 1.55 ppm | Distance to MRE: N/A
  • SBM26-02 | Unnamed | 742.5–745.0 ft | 2.5 ft | Ag: 5.13 opt | Au: 0.019 opt | Zn: 0.07% | Pb: 0.05% | In: 0.203 ppm | Distance to MRE: N/A

What to Watch Next

  • Additional assay results from the ongoing 25,000-foot surface diamond drilling program at the Rainbow Block Project, as the company has reported only the first two drill holes to date.

About Silver Bow Mining Corp.

Silver Bow Mining Corp. (NYSE American: SBMT) is focused on the exploration and development of the Rainbow Block Project, a high-grade silver, gold, zinc, lead, and indium polymetallic vein system located in Butte, Montana. The Company's 100%-owned Rainbow Block Project hosts an initial inferred Mineral Resource Estimate, as detailed in an S-K 1300 compliant Technical Report Summary. Silver Bow Mining Corp. is committed to responsible exploration of this critical minerals project for the benefit of its shareholders, employees, local stakeholders, and the United States.

Read full press release here.

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