Core Silver Confirms Multi Kilometer High Grade Mineralization Open in All Directions

Rhea-AI Summary

Core Silver (CCOOF) reported 2025 exploration results at the Laverdiere Copper Project, Atlin, BC, following prospecting, mapping, 65 rock and 197 soil samples and 2,769 metres of diamond drilling across six holes.

Highlights include surface assays up to 366 g/t Ag, 0.71% Cu and 0.54% Mo, earlier surface results of 316 g/t Ag, 0.62% Cu, 0.78% Mo, newly mapped porphyry veins at Copper Creek 2.3 km south, and confirmed Cu-Mo-Ag mineralization across 4.4 km strike. Several drill holes remain with assays pending and drilling continues into fall 2025.

Positive

• Surface sample: 366 g/t Ag, 0.71% Cu, 0.54% Mo
• Confirmed mineralization across 4.4 km strike at Laverdiere
• 2,769 metres of diamond drilling completed in 2025 (6 holes)
• Porphyry veins traced >200 m at Copper Creek, 2.3 km south of Valley Zone

Negative

• Assays pending for multiple deep holes including LAV25-010 to LAV25-013
• One hole (LAV25-008) was lost after 64 m
• No maiden resource or grade-continuity model reported yet

Company samples 366g/t Ag, 0.71% Cu & 0.54% Mo at the Laverdiere Copper Project

VANCOUVER, BC / ACCESS Newswire / October 9, 2025 / Core Silver Corp. ("Core Silver" or the "Company") (CSE:CC)(FSE:8ZR)(OTCQB:CCOOF) is pleased to provide an update on the 2025 exploration work completed at the Laverdiere Copper Project (the "Project" or "Laverdiere"), eastern Blue Property (the "Property"), Atlin Mining District of NW British Columbia.

Core Silver's 2025 exploration program was designed to evaluate the mineralization potential of an extensive (5km x 8km) Cu-Mo-Ag±Au-bearing porphyry intrusion at the Laverdiere Copper Project through prospecting, detailed structural mapping, regional soil sampling and deep exploratory diamond drilling (Figure 1).

EXPLORATION HIGHLIGHTS

• Six (6) diamond drill holes totaling 2,769 metres have been completed at Laverdiere in 2025 (Table 1).

• Drilling along the Valley Fault has intersected extensive zones of intense hydrothermal alteration and multiple porphyry-style vein assemblages, including:

  • An upper oxidized copper enrichment zone with intermittent chalcopyrite-malachite±molybdenite±bornite mineralization.

  • A molybdenum-rich peripheral zone with coarse molybdenite, specular hematite, silver-bearing sulfosalt mineralization, local chalcopyrite and rare pyrite.

  • A deeper copper-dominant zone with chalcopyrite-molybdenite±bornite veins that show a gradual, visual increase in density and thickness with depth.

• High-grade surface samples at the Valley Zone recently returned assays of up to 366 g/t Ag, 0.71% Cu and 0.54% Mo, reconfirming the presence of high-grade porphyry mineralization along the Valley Fault.

• Earlier in 2025, surface samples along the Valley Fault graded 0.62% Cu with 316 g/t Ag and 0.78% Mo, highlighting grade consistency in veins and mineralized breccias along strike at the Valley Zone (Table 2).

• Newly discovered porphyry veins exposed at Copper Creek, 2.3km south of the Valley Zone, can be traced for over 200-metres along strike. Samples collected here earlier in the 2025 season returned 0.63% Cu with 17 g/t Ag and 355 ppm Mo.

• 65 rock samples and 197 soil samples have been collected in 2025, and prospecting is on-going.

• In total, Cu-Mo-Ag mineralization is now confirmed across 4.4 kilometres at Laverdiere - extending from the Main Copper Skarn Zone (North Adit) to Copper Creek and remains open for expansion in all directions.

• Drilling continues into the fall and updates will be provided as they become available.

Core Silver's President & CEO, Nick Rodway, commented:

"Our 2025 exploration program at Laverdiere continues to indicate the presence of a large-scale copper-molybdenum-silver system over a multi-kilometre strike length. The Valley Zone is returning consistent high-grade surface results, and with deeper drilling now underway, we see potential to uncover an extensive porphyry system associated with multiple high-grade massive copper sulphide skarn showings. With several new zones identified and mineralization open in all directions, Laverdiere has the scale, grade and growth potential to become a cornerstone asset within our Blue Property portfolio and drive significant long-term value for shareholders."

Figure 1: Plan view map showing Calculated Vertical Gradient (CVG) Magnetics and surface sample assay highlights and progress at the Laverdiere Copper Project.

Table 1 - 2025 Diamond Drill Hole Data for the Laverdiere Copper Project
DDH ID	Target	Easting (m)	Northing (m)	Elevation (m)	Azi	Dip	Length	Comments
LAV25-007	Upper Valley Fault	548613	6563903	1381	288	-55	253	Assays Pending
LAV25-008	Upper Valley Fault	548613	6563903	1381	40	-65	64	Hole Lost
LAV25-009	Upper Valley Fault	548613	6563903	1381	45	-65	108	Assays Pending
LAV25-010	Lower Valley Fault	549327	6564089	1188	45	-75	704	Assays Pending
LAV25-011	Lower Valley Fault	549327	6564089	1188	190	-83	800	Assays Pending
LAV25-012	Lower Valley Fault	549277	6563646	1260	10	-70	840	Assays Pending
LAV25-013	Lower Valley Fault	549137	6564299	1284	135	-68	1000*	In Progress*

Table 2 - Best Rock Sample Highlights from the Valley Zone - Laverdiere Copper Project
Sample ID	Target	Easting (m)	Northing (m)	Cu %	Mo ppm	Ag g/t	Au g/t	Year
F421683	Lower Valley Fault	549344	6564112	0.72	5450	366	0.02	2025
F421663	Lower Valley Fault	549346	6564109	0.62	7770	316	0.03	2025
F421662	Lower Valley Fault	549351	6564108	0.47	682	188	0.01	2025
F421684	Lower Valley Fault	549346	6564111	0.25	2393	171	0.01	2025
D935042	Upper Valley Fault	548488	6563956	3.24	531	82	0.56	2022
F421657	Upper Valley Fault	548491	6563969	0.74	320	50	0.71	2025
F422231	Upper Valley Fault	548461	6563872	0.83	70	47	0.44	2024
8803	Lower Valley Fault	549254	6563986	2.73	-	34	0.07	1990
F421664	Lower Valley Fault	549253	6564096	0.25	58	12	0.02	2025
D935060	Lower Valley Fault	549275	6564096	0.42	208	5.5	0.02	2022
D935043	Upper Valley Fault	548471	6563951	1.05	3210	4.3	0.02	2022

ABOUT THE LAVERDIERE COPPER PROJECT

The Laverdiere Copper Project is a low-elevation, drill-permitted, early-stage high-grade Cu-Mo-Ag-Au porphyry-skarn Target. The Project has been sporadically explored since the early 1900s, without ever having received a significant exploration program. Adits driven into the Laverdiere area in the early 1900s reportedly returned up to 27m grading 1.20% Cu. The Llewellyn Fault Zone, a regional and strongly metal-endowed fault, cuts through the Laverdiere Copper Project for 14 km of strike length and marks the contact between the Yukon-Tanana and Stikine Terranes in the Project area. Currently only 1km of the total strike length of this economically important fault zone has been explored. Diamond drilling completed 125m north of the French Adit in 1974 reportedly returned 175m of 0.27% Cu, including 6m of 1.60% Cu and 7.8m of 1.60% Cu. Core Silver's inaugural diamond drilling campaign at the Laverdiere Copper Project in 2022 returned up to 48.5m of 1.02% CuEq (0.90% Cu, 6g/t Ag, and 0.11g/t Au) from 31.46m depth in drill hole LAV22-001 (French Adit), 223m of 0.20% CuEq (0.11% Cu, 2g/t Ag, and 0.006% Mo) from 15m depth in LAV22-002 (French Adit), and 107.38m of 0.31% CuEq (0.11% Cu, 0.023% Mo, 0.9g/t Au, and 0.02g/t Au) from 144.62m depth in hole LAV22-006 (North Adit). The entirety of the 2022 Laverdiere Program results are summarized in the news release dated March 29^th, 2023.

Drilled and mapped high-grade copper-bearing skarn mineralization at Laverdiere is coincident with embayments in the contact zones of the expansive Cretaceous intrusions on the west side of Hoboe Creek. A large unexplored embayment in the intrusion is mapped 8km to the south of the to-date explored zone at Laverdiere and is in contact with Boundary Range metamorphic rocks at this location. Apophyses of the larger granodiorite intrusion are also mapped in contact with limestone and marbles amenable to massive sulphide skarn mineralization approximately 7km to the southwest of the known zones of high-grade porphyry-skarn mineralization.

At Laverdiere, an extensive Cretaceous granodiorite intrusion hosts widespread Cu-Mo-Ag±Au porphyry mineralization. The intrusion is associated with a very high-grade Fe-Cu-Au-Ag massive sulphide skarn occurrence (the "Main Zone") that is exposed at surface along the western flank of the prolific Llewellyn Fault Zone (LFZ) at the porphyry-marble contact. The Main Zone was drill-tested in 2022 and returned significant copper grades over extensive widths including: 267.05m of 0.21% CuEq (0.17% Cu, 1g/t Ag, 0.04g/t Au) from surface including 48.54m of 1.02% CuEq (0.90% Cu, 6g/t Ag, 0.11g/t Au) from 31.46m depth.

In 2024, high-grade porphyry Cu-Mo-Ag±Au mineralization at the newly defined Valley Zone, located 2.2km southwest of the Main Zone, was structurally mapped and sampled. At the Valley Zone, a series of sheeted mineralized porphyry veins and fractures hosted in altered granodiorite have been mapped and sampled over a 1-kilometer east-west trend following the Valley Fault that historically returned up to 3.24% Cu (with 82g/t Ag, 0.56g/t Au and 0.053% Mo) and 0.32% Mo (with 1.03% Cu, 4g/t Ag) in 2022. In 2024, a 20cm thick east-west striking quartz vein grading 0.83% Cu, 47g/t Ag, 0.44g/t Au and 0.007% Mo was discovered on the opposite side of the Valley Fault.

References
¹White, W.H. (1969): Geology and economic prospects of the Laverdiere property
² Fustos, A. (1974). Report on the Results of the 1973 Exploration Programme on the Loon Group. BC Ministry of Energy, Mines and Petroleum Resources, Assessment Report 4996

SAMPLING, PREPARATION & QA/QC

All 2025 rock and drill core samples are transported by helicopter at the end of each field day to the core logging facility in Atlin, BC for processing. Field samples were chosen to capture homogenous lithology, alteration, mineralization, and veining. All rock and drill core samples are submitted to Bureau Veritas (BV) Labs in Whitehorse, YT. Each sample is crushed to 70% passing 2mm, then pulverized to 85% passing 200-micron mesh. All samples then undergo a 4-Acid digestion with an ICP-MS finish for a 59-element ultra trace package (Method Code MA-250), as well as fire assay by Pb collection with ICP-ES finish for Au, Pt, and Pd (Method code FA-330). Samples that hit upper detection limits for elements of interest on the primary multi-element method are further analyzed via a secondary 4-Acid digest with an ICP-OES finish (Method Code MA-370). Extremely high-grade Pb samples were analyzed via a tertiary overlimit method, GC-817.

NATIONAL INSTRUMENT 43-101 DISCLOSURE

Nicholas Rodway, P.Geo, (Licence# 46541) (Permit to Practice# 100359) is President, CEO and Director of the Company, and qualified person as defined by National Instrument 43-101- Standards of Disclosure for Mineral Projects. Mr. Rodway has reviewed and approved the technical content in this release.

ABOUT CORE SILVER CORP.

Core Silver Corp. is a Canadian mineral exploration company focused on the acquisition and development of mineral projects in British Columbia, Canada. The Company currently holds 100% ownership in the Blue Property Mineral Tenure, which covers a land area of114,074 hectares (~1,140 km²). The project lies within the Atlin Mining District, a well-known gold mining camp located in the unceded territory of the Taku River Tlingit First Nation and the Carcross/Tagish First Nation. The Blue Property hosts a major structural feature known as The Llewellyn Fault Zone ("LFZ"). This structure is approximately 140km in length and runs from the Tally-Ho Shear Zone in the Yukon, south through the Blue Property to the Alaskan Panhandle Juneau Ice Sheet in the United States. Core Silver believes that the south Atlin Lake area and the LFZ has been neglected since the last major exploration campaigns in the 1980's. The LFZ plays an important role in mineralization of near surface metal occurrences across the Blue Property Mineral Tenure. The past 50 years have seen substantial advancements in the understanding of porphyry, skarn, and carbonate replacement type deposits both globally and in British Columbia's Golden Triangle. The Company has leveraged this information at the Blue Property Mineral Tenure to tailor an already proven exploration model and believes this could facilitate a major discovery. Core Silver is excited to become one of Atlin Mining District's premier explorers where its team believes there are substantial opportunities for new discoveries and development in the area.

On Behalf of the Board of Directors

CORE SILVER CORP.

"Nicholas Rodway"

President & CEO
Tel: 604.681.1568

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

FORWARD LOOKING STATEMENTS

Statements in this document which are not purely historical are forward-looking statements, including any statements regarding beliefs, plans, expectations, or intentions regarding the future. Forward looking statements in this news release include, but are not limited to, that drilling at the Silver Lime Polymetallic Project will follow the drilling program at the Laverdiere Copper Project; that the first target of the 2025 drilling program will focus on the Valley Zone; and any other general statement regarding the Company's planned or future exploration efforts at the Blue Property. It is important to note that the Company's actual business outcomes and exploration results could differ materially from those in such forward-looking statements. Risks and uncertainties include that the Company may not, due to environmental, technological and other factors, be successful in expanding the mineralization footprint of the Projects as planned; that the Company may be unable to implement its plans to drill at the Silver Lime Polymetallic Project after drilling at the Laverdiere Copper Project, as intended; that the Company may not be able to focus on the intended drill targets, such as planned drill target at the Valley Zone; that the Company may be unable to implement its plans to further explore at the Silver Lime Project and the Laverdiere Project, as applicable; that certain exploration methods, including the Company's proposed exploration model for the Blue Property, may be ineffective or inadequate in the circumstances; that economic, competitive, governmental, geopolitical, environmental and technological factors may affect the Company's operations, markets, products and prices; our specific plans and timing drilling, field work and other plans may change; that the Company may not have access to or be able to develop any minerals because of cost factors, type of terrain, or availability of equipment and technology; and we may also not raise sufficient funds to carry out or complete our plans. The ongoing COVID-19 pandemic, labour shortages, inflationary pressures, rising interest rates, the global financial climate and the conflict in Ukraine and surrounding regions are some additional factors that are affecting current economic conditions and increasing economic uncertainty, which may impact the Company's operating performance, financial position, and prospects. Collectively, the potential impacts of this economic environment pose risks that are currently indescribable and immeasurable. No assurance can be given that any of the events anticipated by the forward-looking statements will occur or, if they do occur, what benefits the Company will obtain from them. Readers are cautioned that forward-looking statements are not guarantees of future performance or events and, accordingly, are cautioned not to put undue reliance on forward-looking statements due to the inherent uncertainty of such statements. Additional risk factors are discussed in the section entitled "Risk Factors" in the Company's Management Discussion and Analysis for its recently completed fiscal period, which is available under the Company's SEDAR profile at www.sedar.com. Except as required by law, the Company will not update or revise these forward-looking statements after the date of this document or to revise them to reflect the occurrence of future unanticipated events.

SOURCE: Core Silver Corp.

View the original press release on ACCESS Newswire

FAQ

What surface grades did Core Silver report at Laverdiere on October 9, 2025 for CCOOF?

Core Silver reported surface assays up to 366 g/t Ag, 0.71% Cu and 0.54% Mo from the Valley Zone in 2025.

How much drilling has CCOOF completed at Laverdiere in 2025 and are results available?

Core Silver completed 2,769 metres across six diamond drill holes in 2025; several holes have assays pending.

How large is the mineralized footprint reported by Core Silver at Laverdiere (CCOOF)?

The company confirmed Cu-Mo-Ag mineralization across a 4.4 km strike length, open in all directions.

Where is the newly discovered porphyry exposure relative to the Valley Zone for CCOOF?

New porphyry veins at Copper Creek are located 2.3 km south of the Valley Zone and traceable for over 200 metres.

What immediate exploration risks did Core Silver disclose for Laverdiere (CCOOF)?

The release notes assays pending for multiple deep holes and one drill hole was lost, indicating incomplete drill results.