Blackrock Silver Announces Final Assays from Eastern Expansion Drill Program at Tonopah West

The Eastern Expansion Drill Program Identified Several Mineralized Northwest Structures Hosting Shallow Mineralization Encountered Within a 1.2 Kilometre Trend

EASTERN EXPANSION PROGRAM HIGHLIGHTS:

• At least three mineralized northwest oriented structures have been identified within the 1.2 kilometre eastern expansion trend running parallel to the Pittsburg-Monarch fault that suggest a series of footwall fault splays as opposed to a singular east-west structure;
• TXC25-173 cut 0.92 metres of 2,122.7 grams per tonne (g/t) silver equivalent (AgEq) (1,162 g/t silver (Ag) & 8.79 g/t gold (Au)) from 220.9 metres, and a separate zone of 1.04 metres grading 534.8 g/t AgEq (189.8 g/t Ag & 3.16 g/t Au) from 215.5 metres;
• TXC25-178 drilled 6.4 metres of 296.6 g/t AgEq (135.7 g/t Ag & 1.47 g/t Au), including 0.46 metres of 3,853 g/t AgEq (1,771 g/t Ag & 19.06 g/t Au) from 183.8 metres in a north-south oriented structure within the M&I Conversion Area at DPB South; and

Blackrock Silver Corp. (TSXV: BRC,OTC:BKRRF) (OTCQX: BKRRF) (FSE: AHZ0) (‘Blackrock’ or the ‘Company’) announces the final results from its fully-funded eastern expansion drill program (the ‘Eastern Expansion Program’ or the ‘Program’) at its 100% owned Tonopah West project located in Nye and Esmeralda Counties, Nevada, United States (‘Tonopah West’).

The Eastern Expansion Program was a follow up to the Company’s successful Scout drilling program completed at Tonopah West in February 2025 (see March 31, 2025 news) which shows additional upside for the shallow southern portion of the Denver-Paymaster and Bermuda-Merten vein groups (‘DPB South‘) resource area (the ‘M&I Conversion Area‘) to expand the resource area 1,200 metres in an easterly direction (the ‘Eastern Expansion Zone‘).

The Company commenced the Eastern Expansion Program in July 2025 within the Eastern Expansion Zone, utilizing reverse circulation (RC) drilling with RC pre-collars to establish initial holes, which were then deepened using diamond core drilling (core tails) for more detailed geological analysis. The Program drilled a total of 6,798 metres (22,896 feet) in twenty-four drillholes, however, only 22 drillholes were completed, as two pre-collar holes were not usable for core tails. Of the 22 completed drillholes, three were core holes completed from surface.

Andrew Pollard, Blackrock’s President and CEO, stated, ‘Whereas we set out to target a single east-west mineralized structure, drilling from our Eastern Expansion Program has defined at least three distinct, parallel mineralized zones oriented northwest. These structures appear to be splays off the Pittsburgh-Monarch fault system. Each of these zones has intersected shallow, high-grade, and thick mineralization, indicating significant potential for further expansion in the area. Additionally, drilling in the M&I Conversion Area at DPB South has successfully connected previously isolated intercepts, confirming the presence of north-south trending structures and suggesting additional tonnage potential. Work on our upcoming mineral resource estimate and preliminary economic assessment is now underway and on track for a targeted completion date in February 2026. These will incorporate data from both our Northwest and Eastern Expansion drill programs.’

Table 1 summarizes the final results of the Eastern Expansion Program using a cut-off grade of 150 g/t AgEq.

Table 1: Eastern Expansion Drill Program Significant Results Using a 150 g/t AgEq Cut-off Grade

The Eastern Expansion Program encountered at least three northwest oriented structures which appear to be mineralized and offset the southern caldera margin to the northeast. The structures are parallel to the Pittsburg-Monarch fault and suggest a series of footwall fault splays associated with the main Pittsburg-Monarch fault. Figure 1 below shows the approximate location and orientation of the northwest fault system.

Drilling to date shows shallow, high-grade, and thick zones of mineralization in each of these structures and suggest increased expansion potential along this northwest structural corridor. Historically, the Pittsburg-Monarch fault was considered an ore control within the district with the thickest historically mined veins at Victor and Ohio abutting the main fault. The Company’s drilling in the Eastern Expansion Zone has returned thick vein intervals of gold and silver along the parallel structures confirming the importance of the Pittsburg-Monarch and its footwall fault splays.

Two drillholes, TXC25-171 and TXC25-178, were drilled in the M&I Conversion Area. These drillholes were directed to the west to understand several north-south structures encountered in the previous drilling. The Program was successful in capturing high-grade drill intervals from the north-south structures and shows there are multiple mineralized structures with similar orientation in the area.

Figure 1: Leapfrog model showing northwest oriented structures in the Eastern Expansion area

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Although below the cut-off grade of 150 g/t AgEq, drillholes TXC25-167, -168, -175, -176, -177 and TXC25-179 were mineralized with silver equivalent values ranging between 31 and 133 g/t AgEq. Table 2 shows the range of gold and silver values encountered along the northwest oriented structures.

Table 2: Mineralized Drillholes from the Eastern Expansion program that are below the 150 g/t AgEq cut-off

Figure 2: Drillhole location map for the Eastern Expansion drillholes reported in this news release

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Below are all the drillhole intervals above the 150 g/t AgEq cut off from the program showing the upside potential of the Eastern Expansion Zone.

Table 3: Eastern Expansion Program Significant Results Using a 150 g/t AgEq Cut-off Grade (TXC25-156 to TXC25-166 released on October 27, 2025)

Figure 3: Tonopah West expansion potential

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Figure 4: Tonopah West Drillhole Location Coordinates (based on GPS readings in the field, Datum UTM, NAD 1927, Zone 11)

Quality Assurance/ Quality Control

All sampling is conducted under the supervision of the Company’s project geologists, and a strict chain of custody from the project to the sample preparation facility is implemented and monitored. The RC samples are hauled from the project site to a secure and fenced facility in Tonopah, Nevada, where they are loaded on to American Assay Laboratory’s (AAL) flat-bed truck and delivered to AAL’s facility in Sparks, Nevada. A sample submittal sheet is delivered to AAL personnel who organize and process the sample intervals pursuant to the Company’s instructions.

The RC samples are lined out at the lab and logged into AAL’s system. The samples are dried, crushed to 85% passing 10 mesh (2mm) and a 250-gram sub-sample split is collected and pulverized to 200 mesh (74 micron) in a ring and puck pulverizer. Then the pulverized material is digested and analyzed for gold using fire assay fusion and an Induced Coupled Plasma (ICP) finish on a 30-gram assay split (FA-PB30-ICP). Silver is determined using five-acid digestion and ICP analysis (ICP-5AM48). Over limits for gold and silver are determined using a gravimetric finish (GRAVAU30 and GRAVAG30). Data verification of the assay and analytical results are completed to ensure accurate and verifiable results. Blackrock personnel insert a blind prep blank, lab blank or a certified reference material approximately every 15th to 20th sample.

Qualified Persons

Blackrock’s exploration activities at Tonopah West are conducted and supervised by Mr. William Howald, Executive Chairman of Blackrock. Mr. William Howald, AIPG Certified Professional Geologist #11041, is a Qualified Person as defined under National Instrument 43-101 – Standards of Disclosure for Mineral Projects. He has reviewed and approved the contents of this news release.

About Blackrock Silver Corp.

Backed by gold and silver ounces in the ground, Blackrock is a junior precious metal focused exploration and development company driven to add shareholder value. Anchored by a seasoned Board of Directors, the Company is focused on its 100% controlled Nevada portfolio of properties consisting of low-sulphidation, epithermal gold and silver mineralization located along the established Northern Nevada Rift in north-central Nevada and the Walker Lane trend in western Nevada.

Additional information on Blackrock Silver Corp. can be found on its website at www.blackrocksilver.com and by reviewing its profile on SEDAR at www.sedarplus.ca.

Cautionary Note Regarding Forward-Looking Statements and Information

This news release contains ‘forward-looking statements’ and ‘forward-looking information’ (collectively, ‘forward-looking statements‘) within the meaning of Canadian and United States securities legislation, including the United States Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical fact, are forward-looking statements. Forward-looking statements in this news release relate to, among other things: the Company’s strategic plans; the anticipated objectives and results from the Company’s drill programs at Tonopah West; the timing of completion of an updated mineral resource estimate and preliminary economic assessment on Tonopah West; the Company’s de-risking initiatives at Tonopah West; estimates of mineral resource quantities and qualities; estimates of mineralization from drilling; geological information projected from sampling results; and the potential quantities and grades of the target zones.

These forward-looking statements reflect the Company’s current views with respect to future events and are necessarily based upon a number of assumptions that, while considered reasonable by the Company, are inherently subject to significant operational, business, economic and regulatory uncertainties and contingencies. These assumptions include, among other things: conditions in general economic and financial markets; accuracy of assay results; geological interpretations from drilling results, timing and amount of capital expenditures; performance of available laboratory and other related services; future operating costs; the historical basis for current estimates of potential quantities and grades of target zones; the availability of skilled labour and no labour related disruptions at any of the Company’s operations; no unplanned delays or interruptions in scheduled activities; all necessary permits, licenses and regulatory approvals for operations are received in a timely manner; the ability to secure and maintain title and ownership to properties and the surface rights necessary for operations; and the Company’s ability to comply with environmental, health and safety laws. The foregoing list of assumptions is not exhaustive.

The Company cautions the reader that forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause actual results and developments to differ materially from those expressed or implied by such forward-looking statements contained in this news release and the Company has made assumptions and estimates based on or related to many of these factors. Such factors include, without limitation: the timing and content of work programs; results of exploration activities and development of mineral properties; the interpretation and uncertainties of drilling results and other geological data; receipt, maintenance and security of permits and mineral property titles; environmental and other regulatory risks; project costs overruns or unanticipated costs and expenses; availability of funds; failure to delineate potential quantities and grades of the target zones based on historical data; general market and industry conditions; and those factors identified under the caption ‘Risks Factors’ in the Company’s most recent Annual Information Form.

Forward-looking statements are based on the expectations and opinions of the Company’s management on the date the statements are made. The assumptions used in the preparation of such statements, although considered reasonable at the time of preparation, may prove to be imprecise and, as such, readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date the statements were made. The Company undertakes no obligation to update or revise any forward-looking statements included in this news release if these beliefs, estimates and opinions or other circumstances should change, except as otherwise required by applicable law.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

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