Core Silver (CSE:CC) has released new geological information and visual results from drill hole LAV25-012, part of its 2025 diamond drilling campaign at the Laverdiere Copper Project in British Columbia’s Atlin Mining District. The hole represents the third of four deep exploratory drill holes completed during the season and provides further data on the scale, continuity, and geological characteristics of copper-molybdenum-silver mineralization at the project.

The Laverdiere Copper Project is located on the eastern portion of the Blue Property, an extensive mineral tenure within northwestern British Columbia. Exploration in 2025 was designed to evaluate the depth potential and lateral continuity of a large, multi-phase Cu-Mo-Ag±Au porphyry system through a combination of diamond drilling, structural mapping, and surface sampling. Over the course of the program, seven drill holes were completed across five priority target areas along the Valley Fault Zone, totaling 3,857 metres of drilling.

Drill Hole LAV25-012 and Southern Extension of the System

Drill hole LAV25-012 was collared approximately 450 metres south of earlier 2025 drill holes LAV25-010 and LAV25-011. The hole targeted a magnetic low anomaly interpreted as an area of enhanced hydrothermal alteration and structural complexity associated with the Valley Fault Zone. Drilled steeply to the north, the hole reached a final depth of 840 metres.

Results from LAV25-012 confirmed the presence of porphyry-style copper-molybdenum-silver mineralization from approximately 325 metres to beyond 825 metres drilled depth. This intersection extended the known southern limit of the Laverdiere Porphyry System by an additional 450 metres within the Valley Zone. Mineralization in the hole consists of multiple intervals of copper- and molybdenum-bearing quartz veining, mineralized breccias, and zones containing higher-grade copper sulphides, including chalcopyrite and locally bornite, particularly below 250 metres drilled depth.

The mineralized intervals are hosted within altered phases of the Laverdiere Porphyry and are bounded by late- to post-mineral intrusive phases. These relationships indicate multiple intrusive and mineralizing events over time. Alteration and mineralization styles observed in LAV25-012 are consistent with those typically associated with large, multi-phase porphyry systems and suggest that the system remains open both at depth and along strike.

Geological Observations and System Scale

Geological logging of LAV25-012 identified extensive zones of late- to post-mineral porphyry intrusions beginning near surface, reinforcing the interpretation that the porphyry system is long-lived and multi-phase in nature. While metal zonation patterns similar to those observed in LAV25-010 and LAV25-011 are present, they are locally overprinted by younger intrusions. In the upper portions of the hole, epithermal quartz-carbonate veins are common, representing a later hydrothermal overprint that has locally remobilized or partially disrupted earlier porphyry mineralization.

Below 325 metres drilled depth, mineralization becomes dominated by copper sulphides within narrow but well-developed zones. These deeper intersections contributed to confirming the southern extension of the porphyry system and further defined its vertical extent.

With less than 6,000 metres drilled across the project to date, Core Silver has delineated porphyry copper-molybdenum-silver mineralization and associated alteration over approximately 600 metres between drill holes LAV25-010 and LAV25-012. When combined with drilling at both the Valley Zone and the Main Zone, mineralization has now been traced over approximately 2.3 kilometres. In a broader context, copper and molybdenum mineralization has been identified across more than 4.5 kilometres along the Valley Fault corridor, highlighting the district-scale nature of the system.

The Laverdiere Copper Project is an early-stage, drill-permitted porphyry-skarn target situated at low elevation. The area has a history of sporadic exploration dating back to the early 1900s but has not previously been subject to sustained, modern exploration programs. The project is underlain by a large Cretaceous granodiorite intrusion that hosts widespread porphyry-style Cu-Mo-Ag±Au mineralization. Along its western margin, the intrusion is associated with high-grade iron-copper-gold-silver massive sulphide skarn mineralization exposed at surface in the Main Zone, near the contact with marble units along the Llewellyn Fault Zone.

Historical underground development in the early 20th century included adits that reportedly intersected up to 27 metres grading 1.20% copper. Subsequent shallow diamond drilling carried out in 1974 approximately 125 metres north of the French Adit reportedly returned 175 metres grading 0.27% copper, including shorter intervals grading 1.60% copper.

Core Silver’s inaugural drilling campaign at Laverdiere in 2022 produced several notable intersections, including 48.5 metres of 0.90% copper with silver and gold credits in drill hole LAV22-001, 223 metres of 0.11% copper and 0.006% molybdenum in LAV22-002, and 107.38 metres of 0.11% copper and 0.023% molybdenum in LAV22-006.

Valley Zone and Additional Targets

In 2024, Core Silver identified and mapped high-grade porphyry Cu-Mo-Ag±Au mineralization at the Valley Zone, located approximately 2.2 kilometres southwest of the Main Zone. Structural mapping and sampling revealed sheeted porphyry veins and mineralized fractures hosted in altered granodiorite over a one-kilometre east–west trend following the Valley Fault. Historical sampling in this area returned values of up to 3.24% copper with silver, gold, and molybdenum, as well as molybdenum values up to 0.32%.

Additional exploration in 2024 identified a 20-centimetre-thick east–west striking quartz vein on the opposite side of the Valley Fault, grading 0.83% copper with associated silver, gold, and molybdenum. Beyond the currently explored zones, mapping has identified large, unexplored embayments in the granodiorite intrusion both south and southwest of Laverdiere that are in contact with carbonate rocks considered favourable for additional skarn mineralization.