• Underground drilling continues to confirm and expand Main and East Lower Zones (ELZ)^1,2,3

• • Main Zone: 9.16 gpt over 25.9m including 18.40 gpt over 4.0m and including 21.52 gpt over 4.8m; 7.01 gpt over 10.2m; 7.63 gpt over 8.6m; 4.75 gpt over 19.3m, including 7.90 gpt over 5.0m; 9.23 gpt over 14.0m, including 13.41 gpt over 8.3m; and 12.79 gpt over 7.3m including 18.45 gpt over 4.4m
  • East Lower Zone: 6.92 gpt over 12.9m, including 9.16 gpt over 7.3m; 13.33 gpt over 13.2m, including 31.04 gpt over 4.7m; 5.25 gpt over 15.4m, including 10.09 gpt over 5.5m; and 10.21 gpt over 3.9m
• Surface drilling extends Main Zone over half a kilometre down plunge to the northeast^1,2,3

• • • 6.34 gpt over 8.7m, including 11.04 gpt over 3.7m

1. All assays are reported uncut.
2. In this news release, “gpt” refers to grams per tonne, and “m” refer to metres.
3. Intervals are reported using both true widths and core lengths.

Discovery Mining Ltd. (TSX: DSV) (OTCQX: DSVSF) reported results from ongoing exploration at the Company’s Borden Mine, as part of the Company’s 255,000 – 285,000 m 2026 exploration program. The results, which include 21 holes (7,036 m), continued to confirm and expand mineral resources and also significantly extended mineralization in the Main Zone, the primary source of current production at the Borden operation.

Tony Makuch, Discovery’s President, CEO and Chairman, commented: “Exploration drilling at Borden continues to generate excellent results. Borden includes an extensive land position in a highly-prospective, under explored, greenstone belt in the Abitibi. Today’s results include further progress with resource conversion and expansion drilling in the Main and East Lower zones, where we continue to produce intersections that as good, or better, than those included the current resource model. In addition, we have been ramping up surface drilling to begin accessing Borden’s larger-scale potential of growth. Early results from surface drilling have been very encouraging, including returning intersections that extend the Main Zone by over half a kilometre down plunge to the northeast from the current inferred resource. These results highlight the prospectivity of the area and are a great start to our plan to build-out the Borden operation. We plan to continue drilling to the northeast to find additional extensions as work to demonstrate that there is much more gold to be discovered on our 1,000 km² land position in the Abitibi near Chapleau.”

Drilling at the Borden Mine included a total of 22 holes (7,411.6m) from surface and underground to convert and expand resources in the Main Zone and East Lower Zone, near the northeast limit of inferred resources (Figures 1, 2 and 3).

Link to 3D Visuals: https://vrify.com/decks/23611?auth=a727fee7-ac0e-4d36-8728-7e60aa2614fd

The Borden Mine is located approximately 190 km southwest of the Dome Mill, near Chapleau and in the south portion of the Borden Lake Greenstone Belt. The Main Zone is an east-west trending structure located along the east – west trending Genesis Deformation Zone adjacent to a major contact between felsic gneiss and amphibolite. Work to date has traced the zone for a strike length of over 1.7 km along strike and indicates the zone is closely associated with quartz veining, biotite-garnet alteration and pyrite. The ELZ is a parallel trending, and less explored, structure located approximately 500 m to the west of the Main Zone where recent work indicates potential for significant upside.

Drilling at the Main Zone included 1 hole (1,344) completed from surface and 14 holes (4,187.6 m) drilled from underground.

Drilling from underground included was completed from cut outs located in the east portion of the 585-exploration drift, situated in the hanging wall of the zone and continued to demonstrate extremely positive results including intercepts of 9.16 gpt over 25.9m including 18.40 gpt over 4.0m and including 21.52gpt over 4.8m, in 585-00275; 12.79 gpt over 7.3m, including 18.45 gpt over 4.4m in hole 585-00142; 6.11 gpt over 3.2m, in hole 585-00130; 7.01 gpt over 10.2m, in 585-00148; 4.75gpt over 19.3m, including 7.90 gpt over 5.0m, in hole 585-00305; and 9.23 gpt over 14.0m, including 13.41 gpt over 8.3m, in hole 585-00306 (Table 1). Holes 585-00142 and 585-00130 were drilled approximately 100 meters down plunge of the current inferred resource and holes 585-00305 and 585-00306 were drilled 75 to 100 meters to the east.

Hole BL26-001119, drilled from surface, targeted 350 meters along strike from the current resource and achieved positive results with an intercept of 6.34 gpt over 8.7m, including 11.04 gpt over 3.7m.

Drilling at the East Lower Zone included 7 holes (1,880 m) completed from two drill bays located on the 585 level to confirm and evaluate expansion potential near the lower limits of the zone. Significant results include: 6.92 gpt over 12.9m, including 9.16 gpt over 7.3m, in hole 585-00292; 13.33 gpt over 13.2m, including 31.04 gpt over 4.7m, in hole 585-00291; 5.25 gpt over 15.4m, including 10.09 gpt over 5.5m, in hole 585-00298; 10.21 gpt over 3.9m, in hole 585-00294; and 3.59 gpt over 17.4, in hole 585-00290, which are located near the limit of the current inferred resource. The zone remains open to depth.

Review of the above drill results indicate that both the Main Zone and East Lower Zone are trending close to plan and with grades and widths that are similar to, or better than, the current resource model. These results, along with new intercepts located down plunge and to the northeast continue to demonstrate the excellent potential for further resource growth as drilling continues.

The program is continuing with four underground drills working to convert and extend resources. Work is also continuing to advance the 585-exploration drift to the northeast to provide new drill platforms for future drilling. Two surface drills are also operating in the area northeast of the Main Zone.

1. All assays are reported uncut.
2. Intervals are reported using both true widths and core lengths.
3. Holes 585-00131 and 585-00140 are not included in the above table as they had low grade values

Figure 1. Borden Mine

 Figure 2. Borden Mine – Deep Main Zone

 Figure 3. Borden Mine – East Lower Zone “ELZ”

QUALIFIED PERSONS

Discovery’s exploration programs at Borden are conducted under the supervision of Eric Kallio, P.Geo., Senior Vice President, Exploration, Kara Byrnes, P. Geo, Vice President, Exploration and Geology – Porcupine and Craig Yuill, P.Geo., Exploration Manager. Mr. Kallio, Ms. Byrnes and Mr. Yuill are “qualified persons” for the purpose of National Instrument 43-101, Standards of Disclosure for Mineral Projects, of the Canadian Securities Administrators, and have reviewed and approved the scientific and technical information in this news release.

Readers are referred to the mineral resource estimate as set out in the Company’s current technical report entitled “Porcupine Complex, Ontario, Canada NI 43-101 Report on Preliminary Assessment” with an effective date of January 13, 2025, which is available under the Company’s issuer profile on SEDAR+ at www.sedarplus.ca. Statements concerning mineral resource estimates may also be deemed to constitute forward looking information to the extent that they involve estimates of the mineralization that will be encountered if the property is developed. The Technical Report includes the results of a preliminary economic assessment which is preliminary in nature. It includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves and there is no certainty that the preliminary economic assessment will be realized.

QA/QC CONTROLS

The Company follows a quality assurance and control program to ensure that sampling and analysis of all exploration work is conducted in accordance with best practices.

At Borden, samples are logged and sampled in a secure facility in Chapleau, Ontario and under supervision of Qualified Geologists. NQ sized core is predominantly sawn in half with one half of the core prepared for shipment, the other half of core retained for future assay verification. Certified reference material standards, coarse blank material and duplicates are inserted every 20 samples. Core samples are picked up by Activation Laboratories and tracked via a chain of custody from site to the certified off-site analytical laboratory for preparation and assaying.

Discovery utilizes the accredited external lab Activation Laboratories to manage its core analysis. ActLabs is certified by the Standards Council of Canada which conforms with ASB-RG Mineral Analysis Laboratory for the Accreditation of Mineral Analysis Testing Laboratories and CAN-P-4E ISO/IEC 17025: General Requirements for the Competence of Testing and Calibration Laboratories.

Sample preparation includes crushing drill core up to 80% passing 2 mm, riffle splitting 500 grams and pulverizing to 95% passing 105 µm followed by both scheduled and specifically requested silica sand cleaning. Gold Analysis involves Fire Assay – Atomic Absorption technique from a 50-gram pulp sample with grade ranges between 5 to 10,000 ppb. Samples greater than 10,000 ppb are analyzed with a gravimetric finish. Selected high grade samples are also analyzed using the screen metallics procedure.

ABOUT DISCOVERY

Discovery Mining Ltd. is a growing precious metals company that is creating value for stakeholders through exposure to gold, silver and other critical minerals. Discovery is advancing plans to more than double annual gold production through investment in the Company’s Porcupine assets, which include multiple operations, attractive growth projects and significant exploration upside in one of the world’s most renowned gold camps in and near Timmins, Ontario. The acquisition of the Kidd Operations in June 2026 further increased Discovery’s land position within the camp, provided valuable infrastructure that will support the Company’s growing gold business, and added critical minerals to the Company’s current production profile. Discovery’s silver exposure comes mainly from the 100%-owned Cordero project, one of the world’s largest undeveloped silver deposits, which is located close to infrastructure in a prolific mining belt in Chihuahua State, Mexico.