Blackrock Silver Corp. announced the final set of assay results from its Resource Expansion Program (defined below) showing significant width and high-grade silver and gold drill intercepts in step-out drilling at its 100% owned Tonopah West project ("Tonopah West") located in Nye and Esmeralda Counties, Nevada, United States. Highlights: TXC25-144 cut 10.12 metres grading 467 grams per tonne (g/t) silver equivalent (AgEq) (283 g/t silver (Ag) & 2 g/t gold (Au)), including 3.51 metres of 1,020 g/t AgEq (620 g/t Ag & 4.43 g/t Au); TXC25-145 encountered multiple zones of high-grade mineralization which included 0.67 metres of 3,264 g/t AgEq (2,008 g/t Ag & 13.93 g/t Au) within 11.58 metres grading 327 g/t AgEq (186 g/t Ag & 1.56 g/t Au) and 2.32 metres grading 401 g/t AgEq (242 g/t Ag & 1.76 g/t Au); TXC25-153 drilled 0.7 metres of 724 g/t AgEq (437 g/t Ag & 3.18 g/t Au) within 5.73 metres of 156 g/t AgEq (96 g/t Ag & 0.67 g/t Au); Step-out drilling has established continuity of high-grade gold & silver mineralization over significant widths that runs 500 metres along drill-defined strike from the existing DPB resource shell to the northwest; and Targeting is now underway to bridge mineralization on remaining 500 metres of vein corridor to NW Step Out resource area.
Blackrock's resource expansion program at Tonopah West (the "Resource Expansion Program"), which commenced in September 2024, consisted of 18 drillholes totalling 10,802 metres (35,438 feet) of drilling, targeted expansion potential along a one-kilometre northwest trend between the Denver- Paymaster and Bermuda-Merten vein groups ("DPB") south resource area and the Northwest ("NW") Step Out resource area. The aim of the Resource Expansion Program is to increase the size of the Tonopah West resource footprint and to allow evaluation and inclusion of the NW Step Out resource in an updated preliminary economic assessment to be completed on Tonopah West. This final batch of assay results from the Resource Expansion Program tracked high-grade gold and silver mineralization across significant widths spanning 500 metres from the existing DPB resource area to the northwest.
The NW vein system is located along contacts between lithologic units and forms a wide anastomosing and intersecting network of veins and breccias within the West End Rhyolite package. The veins dip approximately 55 degrees to the northeast and show excellent continuity over approximately 500 metres of strike. TXC25-124, -144, and TXC25-145 have especially wide zones above the 150 g/t AgEq cut off.
TXC25- 154 returned an exceptionally wide zone of low-grade over 17.1 metres with 0.154 g/t Au and 25.8 g/t Ag. These drillhole intercepts show the system has strength and ability to mineralize a large volume of rock. The position, orientation and character of the NW vein system is consistent with the outer ring structure of the Fraction caldera marked farther south by the Merten vein.
The mineralization is open to the northwest and down dip to the northeast giving ample room for additional resource expansion of the Tonopah West silver and gold system. 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.
