Goliath Drills Up To 9.12 g/t AuEq Over 11.27 Meters With Visible Gold And Expands Bonanza Zone At The High-Grade Gold Surebet Discovery That Remains Open For Expansion, Golden Triangle, B.C.

2026-09-18

TSXV - TSX Venture Exchange · Gold · Silver · Copper · Lead · Zinc · Molybdenum · Canada · Drill Results

Drill hole GD-26-431 intersected two neighbouring broad mineralized intervals that are part of the Bonanza Zone in the western fringes of the mineralized system,see Figures 1a - 1c.: The first interval assayed 9.12 g/t AuEq over 11.27 meters, including 13.89 g/t AuEq over 7.14 metersthat consists of stockwork and breccia veins associated with calc-silicate and biotite alteration with Visible Gold to the Naked Eye (VG-NE), galena, sphalerite, and pyrrhotite mineralization; The second interval assayed4.70 g/t AuEq over 3.03 meters, within a broader interval of 1.08 g/t AuEq over 20.00 meters that is proximal to the Big Bulk Zone. In this interval stockwork veins and veinlets are associated dominantly with biotite, sericite alteration and pyrrhotite.

Accompanying infographics are available at: https://www.globenewswire.com/NewsRoom/AttachmentNg/209eb3bd-a4b2-4840-b723-ecf5daf3d8f8 https://www.globenewswire.com/NewsRoom/AttachmentNg/80646156-e00c-485c-ab35-3e7f9959dcce https://www.globenewswire.com/NewsRoom/AttachmentNg/db9ea5d1-f823-4933-b2ab-95fcdaa90c1f

_*Forreported assay intervals and AuEq calculation please see QA/QC Section on page 16._

Drill hole GD-26-442 intersected8.35 g/t AuEq over 4.15 meters, including 31.42 g/t AuEq over 1.00 meter. This intercept is part of the new 100 meter Bonanza Zone expansion step-out to the north in 2026, where mineralization consists of quartz-sulphide veins associated with localized biotite and sericite alteration, VG-NE, galena, sphalerite, and pyrrhotite; see Figures 2a and 2b. Accompanying infographics are available at: https://www.globenewswire.com/NewsRoom/AttachmentNg/3471d4c3-d4a0-4012-ae5b-a551b9f464b8 https://www.globenewswire.com/NewsRoom/AttachmentNg/55f3c7c4-7af2-4f56-b381-db572d9bab9f

_*For reported assay intervals and AuEq calculation please see QA/QC Section on page 16._

The expanded high-grade core of the Bonanza Zone is located above the valley floor, potentially making it a great target for initial underground mining operations using gravity methods. Drilling conducted during the 2026 program intersected mineralization in multiple step-out drill holes, resulting in the expansion of the Bonanza Zone by 750 meters to the southwest, 100 meters to the west, 100 meters to the north and 160 meters to the northeast. The Bonanza Zone remains open for expansion and assays are pending; see Figure 3. An accompanying infographic is available at: https://www.globenewswire.com/NewsRoom/AttachmentNg/11f5b617-56df-4cdd-8814-5005e168c88f

The total footprint of the Surebet system is 2.01 km2, which represents a 12% increase compared to 1.8 km2defined prior to the 2026 drilling season. Multiple drill holes intercepts from 2026 have expanded the Bonanza Zone to 1.51 km2from 1.27 Km2(a 19% increase) and the Golden Gate Zone to 1.17 Km2from 0.85 Km2(a 38% increase) and both remain open for expansion; see news August 24, 2026. Visible Gold to the Naked Eye (VG-NE) has been intersected in multiple veins and shear zones from 52 out of 92 holes drilled in 2026 continuing to confirm consistency of gold mineralization widely disseminated throughout the Surebet system that remains open laterally and at depth; see Figures 4a - 4e. Accompanying infographics are available at: https://www.globenewswire.com/NewsRoom/AttachmentNg/02f64576-d934-475a-b5ab-ad05551b9c21 https://www.globenewswire.com/NewsRoom/AttachmentNg/542966ff-a180-42bf-a10c-d58471d8313b https://www.globenewswire.com/NewsRoom/AttachmentNg/10ec6c46-0b77-4058-8357-3615df27fcb8 https://www.globenewswire.com/NewsRoom/AttachmentNg/2587185d-05e0-42d0-ac6b-1646c1ed32de https://www.globenewswire.com/NewsRoom/AttachmentNg/ef950518-4d81-47b6-964b-0d770d8f8f77

All drill holes from the 2026 drill program completed to date have intersected quartz-sulphide mineralization which typically coincide with high-grade gold mineralization. Only a hand full holes with complete gold equivalent (AuEq) assays have been reported to date from a total of 97 drill holes for this year’s program; many more assays to come. The fully funded 2026 drill program comprises approximately 50,000 meters of systematic drilling, including 7 drill rigs targeting expansion of the known gold mineralization laterally and at depth, focused on the Bonanza, Eldorado, Golden Gate, Surebet and Whopper Zones.

TORONTO, Sept. 18, 2026 (GLOBE NEWSWIRE) -- GoliathResources Limited (TSX-V: GOT) (OTCQX: GOTRF) (FSE: B4IF) (the “Company” or “Goliath”) is pleased to report assay results for drill holes GD-26-426, GD-26-431 and GD-26-442 from the Bonanza Zone at the Surebet Discovery on its 100% owned Golddigger Property (the “Property”), Golden Triangle, British Columbia.All reported holes contain substantial gold-mineralization characterized by the widespread presence of VG-NE that continues to demonstrate increased confidence in the continuity as well as the expansion potential of the Surebet High-Grade Gold System.

Dr. Quinton Hennigh, Advisor to Goliath and Strategic Investor commented: “When I see so many intercepts the likes of 9.12 gpt AuEq over 11.27 meters on the edge of a large system like Surebet, it clearly confirms there remains significant room for growth. This year’s drill program continues to deliver results that strongly indicate this high-grade gold system has room for expansion. In 2026 the Company used a systematic approach to drilling that already has demonstrated a significant increase in the overall size of this system that still remains open both laterally and to depth. I look forward to seeing further results such as this.”

Mr. Roger Rosmus, Founder & CEO of Goliath states:_“We are pleasantly surprised that as we have focused on step out drilling during the 2026 drilling campaign to grow the dimensions of the Surebet system it has delivered. I think it is important to point out that we have not stepped out with narrow spacing of the holes like most high-grade vein systems require. We wanted to put the Surebet to test this year to see if we could get near the edges of the system, instead of finding the edges, the system is widening. Several of our step out holes have been 100 metres and up to 750 metres. The footprint of high-grade with visible gold just keeps getting larger which is rare to see. We have only reported a small handful of gold equivalent drill hole results to date, with the vast majority are pending assays. We look forward to reporting additional drill results as they become available, stay tuned.”_

Drill Hole GD-26-431 (Pad 4, Azimuth 40, Dip 85) successfully intersected two distinct mineralized intervals within the Bonanza Zone along the western fringes of the system. The first interval returned high-grade results, assaying 9.12 g/t AuEq over 11.27 meters, which includes a higher-grade core of 13.89 g/t AuEq over 7.14 meters. Mineralization in this upper intercept consists of stockwork and breccia veins associated with calc-silicate and biotite alteration, featuring abundant VG-NE alongside galena, sphalerite, and pyrrhotite. The second deeper interval assayed 4.70 g/t AuEq over 3.03 meters, within a broader interval of 1.08 g/t AuEq over 20.00 meters where mineralization is hosted primarily in stockwork veins and veinlets accompanied by biotite-sericite alteration and pyrrhotite that is proximal to the new Big Bulk Zone.

Drill Hole GD-26-442 (Pad 15, Azimuth 310, Dip 79) targeted the northern 100 meter step-out expansion of the Bonanza Zone. This hole successfully intersected 8.35 g/t AuEq over 4.15 meters, which includes a high-grade interval of 31.42 g/t AuEq over a 1.00-meter core length. Mineralization in this zone is characterized by well-defined quartz-sulphide veins associated with localized biotite and sericite alteration, VG-NE, galena, sphalerite, and pyrrhotite.

Drill Hole GD-26-426 (Pad 15, Azimuth 310, Dip 79) tested a strategic 100 meter step-out interval of the Bonanza Zone to the north-northwest. This hole intersected a high-grade sub-interval of 5.07 g/t AuEq over 3.91 meters within a broader interval of 2.93 g/t AuEq over 7.00 meters. The intercept is defined by a sheared quartz breccia containing VG-NE, accompanied by massive to stringer concentrations of sphalerite, pyrrhotite, galena, and chalcopyrite.

Table 1: Gold and gold equivalent assay results.

| Hole ID | | From (m) | To (m) | Interval (m) | Au (g/t) | Ag (g/t) | Cu % | Pb % | Zn % | AuEq (g/t) | | GD-26-431 | Interval | 372.20 | 388.21 | 16.01 | 6.34 | 5.31 | 0.01 | 0.06 | 0.15 | 6.48 | | Including | 374.20 | 385.47 | 11.27 | 8.93 | 6.78 | 0.01 | 0.08 | 0.20 | 9.12 | | | Including | 374.20 | 381.34 | 7.14 | 13.71 | 6.38 | 0.01 | 0.08 | 0.22 | 13.89 | | | Including | 374.20 | 375.23 | 1.03 | 74.33 | 12.51 | 0.01 | 0.06 | 0.43 | 74.66 | | | And | 380.46 | 381.34 | 0.88 | 22.18 | 30.06 | 0.01 | 0.41 | 1.21 | 23.06 | | | Interval | 391.00 | 411.00 | 20.00 | 0.98 | 3.67 | 0.01 | 0.04 | 0.07 | 1.08 | | | Including | 396.94 | 407.90 | 10.96 | 1.58 | 4.47 | 0.01 | 0.06 | 0.11 | 1.70 | | | Including | 401.09 | 404.12 | 3.03 | 4.65 | 2.11 | 0.01 | 0.00 | 0.02 | 4.70 | | | GD-26-442 | Interval | 529.00 | 533.15 | 4.15 | 7.33 | 41.80 | 0.01 | 1.23 | 0.60 | 8.35 | | Including | 529.00 | 530.00 | 1.00 | 27.58 | 159.00 | 0.02 | 4.67 | 2.25 | 31.42 | | | GD-26-426 | Interval | 585.00 | 592.00 | 7.00 | 2.64 | 7.77 | 0.01 | 0.17 | 0.51 | 2.93 | | Including | 585.00 | 588.91 | 3.91 | 4.64 | 12.27 | 0.01 | 0.29 | 0.69 | 5.07 | | | Including | 587.12 | 588.00 | 0.88 | 19.90 | 29.65 | 0.02 | 0.82 | 2.06 | 21.05 | |

*For reported assay intervals and AuEq calculation please see QA/QC Section on page 16

Table 2: Collar information for drill holes reported in this news release.

| Hole ID | CRS | Easting (m) | Northing (m) | Elevation (m) | Azimuth (deg) | Dip (deg) | Length (m) | | GD-26-431 | NAD83 / UTM zone 9N | 456710 | 6162961 | 1639 | 40 | 85 | 489 | | GD-26-442 | NAD83 / UTM zone 9N | 457189 | 6163130 | 1704 | 310 | 79 | 600 | | GD-26-426 | NAD83 / UTM zone 9N | 457189 | 6163130 | 1704 | 310 | 79 | 642 |

Surebet Discovery Highlights

100% of the drill holes completed prior to the 2026 drill season have intersected gold mineralization, clearly demonstrating remarkable grade continuity and widths, with over 1,500 diamond drill hole intercepts (pierce points); ~77% have 25 – 50 meter spacings. Demonstrating the geological team has a great understanding of the system and its predictability. The most recent ore mineralization model incorporating all available data prior to the 2026 drill program identified five (5) stacked gold-mineralized vein systems/zones: Bonanza, Surebet, Golden Gate, Whopper, and Eldorado. Collectively these zones comprise 46 gold-rich lodes/veins and multiple subvertical Eocene-aged dyke swarms. A good analogy for the stacked veins that are gently-dipping is the Pogo Mine in Alaska. (see Table 3 and Figure 5).

Table 3: Five main modelled gold rich zones and dykes, see isometric view in Figure 5 below.

An accompanying infographic is available at: https://www.globenewswire.com/NewsRoom/AttachmentNg/84190ef0-d9a6-4a60-8f51-63d1bb312a38

92% of the holes (355 out of 386) drilled prior to the 2026 drill season at Surebet contain VG-NE and 100% of holes drilled to date at the Surebet Discovery have intersected quartz-sulphide mineralization. See news releases dated: July 7, 2025, June 23, 2025, January 7, 2025, January 13, 2025, February 10, 2025, February 18, 2025, February 27, 2025, December 12, 2024, July 30, 2024, January 20, 2026, December 2, 2025, November 17, 2025, October 27, 2025, September 22, 2025, September 8, 2025, August 26, 2025, and July 28, 2025 (see Figure 6).

An accompanying infographic is available at: https://www.globenewswire.com/NewsRoom/AttachmentNg/1ffad7b3-f20f-4e25-8fa5-74c1d6386da1

High-grade gold has been identified in three distinctive rock types, including: quartz-sulphide breccias and stockwork veins hosted in the sedimentary units; precious and base metals bearing veins hosted in the volcanic units; and intermediate to felsic Eocene-aged dykes. All mineralized rock types contain substantial amounts of VG-NE (from fine-grained to coarse-grained gold) and remain open for expansion. Metallurgical testing conducted on a composite core sample resulted in metal recoveries of 92.2% for Au, 86.5% for Ag, 94.2% for Pb and 96.9% for Zn achieved through a combination of simple gravity and flotation circuits. The gravity-only recoveries amount to 48.8% Au and 10.3% Ag with a crush size of 327 micrometer (no cyanide leaching required to recover the gold and silver). The metallurgical testing completed to date shows a benign rock composition without deleterious elements (see news release March 1, 2023). The consistent continuity, widths and grade of ore mineralization demonstrated by >156,000 meters of drilling in multiple stacked lodes/veins confirms that the 1.8 km2 Surebet Discovery continues to demonstrate strong potential to become one of the most significant high-grade gold discoveries in British Columbia’s Golden Triangle in many years.

The best hole drilled to date from the gold-rich stacked quartz-sulphide breccias and stockwork veins hosted in the sedimentary units is GD-23-157 that assayed 21.08 g/t AuEq (18.95 g/t Au and 95.31 g/t Ag) over 23.00 meters, including 33.75 g/t AuEq (30.39 g/t Au and 150.42 g/t Ag) over 14.00 meters, including 50.27 g/t AuEq (45.27 g/t Au and 225.42 g/t Ag) over 9.00 meters (see news release dated August 15, 2023). More details on the QA/QC protocol can be found in the section titled “QA/QC Protocol” below. The best hole drilled to date from the precious and base metals bearing veins hosted in the volcanic units is GD-24-260 from the Golden Gate Zone that assayed 34.52 g/t AuEq (34.47 Au and 3.96 Ag) over 39.00 meters, including 132.93 g/t AuEq (132.78 Au and 12.98 Ag) over 10.00 meters, and 166.04 g/t AuEq (165.84 Au and 16.07 Ag) over 8.00 meters (see news release dated January 13, 2025). More details on the QA/QC protocol can be found in the section titled “QA/QC Protocol” below. The best hole drilled to date from the Big Bulk Zone, previously reported as the volcanic wedge zone, is GD-24-291 that assayed 1.97 g/t AuEq (1.92 Au and 1.85 Ag) over 33 meters (see news release dated August 31, 2026). This zone is composed of dense networks of thin mineralized veinlets interpreted to represent distributed fractures filled by mineralized fluids within structural interaction damage zones developed around the Bonanza–Golden Gate junctions. More details on the QA/QC protocol can be found in the section titled “QA/QC Protocol” below. The best hole drilled to date from the Eocene-aged dykes is GD-22-58 that assayed 12.03 g/t AuEq (11.84 g/t Au and 15.61 g/t Ag) over 10.00 meters including 19.91 g/t AuEq (19.62 g/t Au and 25.61 g/t Ag) over 6.00 meters, including 23.82 g/t AuEq (23.47 g/t Au and 30.54 g/t Ag) over 5.00 meters, plus a second separate interval down hole of 8.59 g/t AuEq (8.35 g/t Au and 20.74 g/t Ag) over 5.00 meters (see news release dated March 13, 2025). More details on the QA/QC protocol can be found in the section titled “QA/QC Protocol” below. A study completed by the Colorado School of Mines confirms a new interpretation of the ore forming process at Surebet and suggests a common magmatic source for the high-grade gold system hosted in three distinct rock types. Until this study, researchers and explorers in the Golden Triangle had not recognized the high-grade gold discovery potential in the Eocene-aged dykes (see news release March 13, 2025), which is showing the potential that these discoveries could be a geological breakthrough in the Golden Triangle of British Columbia. Based on positive grassroots exploration and drill results in recent years, Goliath now controls 91,518 hectares (226,146 acres), inclusive of 56 kilometers of the Red Line geologic trend providing for additional discovery potential. The Golddigger Property is located adjacent to tidewater with a barge route to Prince Rupert (190 km south) and close to existing infrastructure including the town of Kitsault proximal to a permitted mine site on private property.

About Golddigger Property

The Golddigger Property is 100% owned and covers an area of 91,518 hectares in a highly prospective geological setting of the Eskay Rift, within 3 kilometers of the Red Line in the Golden Triangle of British Columbia. This area has hosted some of Canada’s greatest gold mines including Eskay Creek, Premier and Snip. Other significant and well-known deposits in the Golden Triangle include Brucejack, Copper Canyon, Galore Creek, Granduc, KSM, Red Chris, and Schaft Creek. Goliath controls 56 kilometers of the Red Line which is a geologic contact between Triassic age Stuhini rocks and Jurassic age Hazelton rocks used as key markers when exploring for gold-copper-silver mineralization.

The Surebet discovery has shown predictable continuity and good metallurgy with gold recoveries of 92.2% from gravity and flotation at a 327-micrometer crush, including 48.8% recovery of free gold from gravity alone (no cyanide required to recover the gold). The metallurgical testing completed to date shows no presence of deleterious elements (see news release dated March 1, 2023).

The Property is in a well positioned location in close proximity to the communities of Alice Arm and Kitsault where there is a permitted mill site on private property. It is situated adjacent to tide water with direct barge access to Prince Rupert (190 kilometers via the Observatory inlet/Portland inlet). The town of Kitsault is accessible by road (190 kilometers from Terrace, 300 kilometers from Prince Rupert) and has a barge landing, dock, and infrastructure capable of housing at least 300 people, including high-tension power.

Additional infrastructure in the area includes the Dolly Varden Silver Mine Road (only 7 kilometers to the East of the Surebet discovery) with direct road access to Alice Arm barge landing (18 kilometers to the south of the Surebet discovery) and high-tension power (25 kilometers to the east of Surebet discovery). The city of Terrace (population 16,000) provides access to railway, major highways, and airport with supplies (food, fuel, lumber, etc.), while the town of Prince Rupert (population 12,000) is located on the West Coast of British Columbia and houses an international container seaport also with direct access to railway and an airport.

Qualified Person

Mr. Rein Turna P. Geo is the qualified person as defined by National Instrument 43-101, for Goliath Resources Limited projects, and supervised the preparation of, and has reviewed and approved, the technical information in this release. Mr. Turna is an Independent Director of the Company.

About CASERM (Center to Advance the Science of Exploration to Reclamation in Mining)

Goliath Resources is a paying member and active supporter of the Center to Advance the Science of Exploration to Reclamation in Mining (CASERM), which is one of the world’s largest research centers in the mining sector. CASERM is a collaborative research venture between Colorado School of Mines and Virginia Tech that is supported by a consortium of mining and exploration companies, analytical instrumentation and software companies, and federal agencies aiming to transform the way geoscience data is acquired and used across the mining value chain. The center forms part of the I-UCRC program of the National Science Foundation. Research focuses on the integration of diverse geoscience data to improve decision making across the mine life cycle, beginning with the exploration for subsurface resources continuing through mine operation as well as closure and environmental remediation. Over the past three years, Goliath Resources’ membership in CASERM has allowed a high level of research to be performed on the Surebet Discovery.

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