Final Assay Results from the M&I Conversion Program Confirm High-Grade Continuity of Gold and Silver Mineralization over 350 Metres in the M&I Conversion Area

HIGHLIGHTS:

• TXC25-139 cut 9.05 metres grading 367 grams per tonne (g/t) silver equivalent (AgEq) (182.8 g/t silver & 2.04 g/t gold) from 187.5 metres, including 0.82 metres grading 2,886 g/t AgEq (1,411 g/t Ag & 16.13 g/t Au), Ag/Au ratio 90:1;
• TXC25-150 drilled 2.84 metres grading 671.5 AgEq (367 g/t Ag & 3.41 g/t Au) from 162.3 metres, including 0.76 metres grading 1,554 g/t AgEq ( 819 g/t Ag & 8.14 g/t Au);
• TXC25-146 intercepted 1.16 metres of 1,111 g/t AgEq (615 g/t Ag & 5.50 g/t Au) from 189.5 metres;
• Results from the entirety of the M&I Conversion Program have validated the geologic model, successfully establishing continuity of the high-grade shoots bearing robust geometry over 350 metres. The shoots remain open to the Northwest and downdip;
• Significant new zones of near-surface mineralization were encountered during the M&I Conversion Program at higher-than-average grades updip from the existing resource shell;
• Modelling of the M&I Conversion Program drillholes is now underway with an updated mineral resource estimate on Tonopah West on track for Q3, 2025; and
• Assay results for 7 drillholes from the Company’s Northwest step out resource expansion area are currently pending. (see February 24, 2025 news release)

Blackrock Silver Corp. (TSX-V: BRC) (OTCQX: BKRRF) (FSE: AHZ0) announces the final set of high-grade silver and gold drill intercepts from its recently completed M&I Conversion Program (as defined herein) at its 100% owned Tonopah West project located in Nye and Esmeralda Counties, Nevada, United States.

The Company has completed its in-fill drilling program at Tonopah West which commenced in mid July 2024 and consisted of 62 drillholes totalling 12,580 metres (41,271 feet) within the shallow southern portion of the Bermuda-Merten vein group resource area. The objective of the M&I Conversion Program is to convert between 1.0 and 1.5-million tonnes of material from inferred mineral resources to measured and indicated mineral resources. The M&I Conversion Area represents the initial years of anticipated production at Tonopah West based on the mine plan laid out in the Company’s Preliminary Economic Assessment on Tonopah West (see September 4, 2024 news release).

Andrew Pollard, the Company’s President and Chief Executive Officer, stated: “With all assays now received from our M&I Conversion Program, we’ve validated our geologic model at Tonopah West and confirmed continuous high-grade mineralization over a 350-metre zone. Results from this program featured standout grades that reinforce the Tonopah West project’s position as one of the top undeveloped silver assets in the sector. In addition to strengthening confidence in known zones through tighter drill spacing, the program also outlined new near-surface zones of ultra-high-grade gold and silver mineralization, representing meaningful new tonnage potential. These results will be incorporated into an updated mineral resource estimate on Tonopah West anticipated to be completed Q3 2025, aimed at upgrading significant tonnage to the measured and indicated categories to help de-risk the early years of anticipated production.”

Table 1: Tonopah West Assay Intercepts using 150 g/t AgEq cut off

The geometry of the high-grade silver and gold is sizable with high-grade shoots plunging to the northwest and showing continuity over 350 metres within the M&I Conversion Area. These shoots remain open to the northwest and open down plunge. Multiple high-grade intercepts have been returned pursuant to the M&I Conversion Program. TXC25-139 returned over 9-metres grading 183 g/t silver and 2.04 g/t gold for 367 g/t AgEq. This intercept is immediately adjacent to mineralization found in TXC25-138 (see May 8, 2025 news release) where a composite zone of 11.46 metres of 514 g/t AgEq (290 g/t Ag & 2.48 g/t Au) was encountered. The thickness of this mineralized vein is approaching those seen in the historic mining at the Victor and Ohio mines at Tonopah West where Victor was 24 metres thick and Ohio was 15 metres thick.

The completion of the M&I Conversion Program now allows for modelling of the vein shoots and high-grade gold and silver for an updated mineral resource estimate which is anticipated to be completed this fall. Management of the Company believes the updated mineral resource estimate will show excellent continuity between the high-grade zones and an increase in confidence of the DPB portion of the mineral resource. This information will assist in the design and implementation of an exploration decline, underground test mining and extraction of a bulk sample for metallurgical processing at Tonopah West.

Table 2 shows all of the intercepts above 150 g/t AgEq encountered pursuant to the M&I Conversion Program. Approximately 65% of the drilling returned values above 150 g/t AgEq with the remaining drillholes returning mineralization, albeit below the cutoff. No drillhole in the campaign was completely barren of gold or silver.

Table 2:Significant Assays From The M&I Conversion Program Above 150 g/t AuEq Cutt Off

Figure 1: Tonopah West project showing NI43-101 resource location and expansion potential

Figure 2 is a plan map showing the location of all the drillholes completed under the M&I Conversion Program and highlighting those reported in this news release.

Figure 2: Drillhole location map of the M&I Conversion Program showing drillholes reported in this news release.

Table 3: 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 and core 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 in to AAL’s system. The core samples are cut using core saws and personnel at AAL’s facility in Sparks, Nevada according to the Company’s instructions delivered with each core hole.

All 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.