Core Silver Extends High-Grade Silver-Polymetallic Sulphide Mineralization at the Jackie Target

Rhea-AI Summary

Core Silver Corp. (OTC.QB:CCOOF) has announced significant drilling results from its Jackie Target at the Silver Lime Polymetallic Project in British Columbia. The company completed three diamond drill holes totaling 564 meters, successfully extending high-grade silver-polymetallic sulphide mineralization.

Key findings include drill hole SLM25-067, which intersected argentiferous galena and sphalerite-bearing sulphide mineralization over 150m, confirming mineralization continuity to 182m true depth. Surface samples revealed exceptional grades, including 1,090g/t Ag with >20% Pb, 5.73% Zn and 2.0% Cu.

The company also announced the resignation of director Andrew Carne and engaged Upswitch Media Corp. for marketing services in a $1,000,000 contract over four months.

Positive

• Successful extension of mineralization to 182m true depth, confirming continuity
• Exceptional surface grades up to 1,090g/t Ag with >20% Pb, 5.73% Zn and 2.0% Cu
• Multiple high-grade silver-bearing polymetallic mineralization styles discovered across diverse lithologies
• Mineralization remains open at depth and in multiple directions, indicating expansion potential

Negative

• All three 2025 drill holes currently have pending assays
• Significant marketing expense of $1M over just four months may impact cash reserves

VANCOUVER, BC / ACCESS Newswire / October 1, 2025 / Core Silver Corp. ("Core Silver" or the "Company") (CSE:CC)(FSE:8ZR)(OTC.QB:CCOOF) is pleased to provide an update for the 2025 diamond drilling at the Jackie Target (" Jackie ") at the Silver Lime Polymetallic Project (the " Project "), central Blue Property (the " Property "), Atlin Mining District of NW British Columbia.

Highlights

• Three (3) diamond drill holes totalling 564 meters were completed at the Jackie Target in 2025 (Figure 1, Table 1).

• Drilling in 2025 was designed to test a >150-meter-long, northwest-southeast trend containing significant exposures of untested and high-grade Ag-rich carbonate replacement mineralization (CRM), skarn and vein-hosted polymetallic mineralization at Jackie, and to extend known intervals of high-grade Ag-Zn-Pb-Cu mineralization to depths exceeding 100m.

• SLM25-067, the first drill hole completed of the 2025 season, successfully intersected repetitive zones of argentiferous galena and sphalerite-bearing sulphide mineralization for over 150m along this trend and confirmed continuity of mineralization intersected in 2022 to 182m true depth (211m drilled depth).

• In 2022, drill hole SLM22-001 successfully extended sulphide mineralization at the southeast section of the trend and intersected 21.65m of 23g/t Ag, 1.0% Zn, 1.2% Pb and 0.08% Cu from surface, including 1.25m of 215g/t Ag, 9.9% Zn, 8.9% Pb and 0.36% Cu (Figure 2).

• Exposed and untested, ultra-high-grade massive and semi-massive sulphide occurrences located along the northwest section of the trend have returned exceptional surficial grades including: 1,090g/t Ag with >20% Pb, 5.73% Zn and 2.0% Cu (Sample 152027; 2021), 767g/t Ag, 48.3% Pb, 1.7% Zn and 1.12% Cu, (Sample F422175; 2024), and 583g/t Ag, 40.8% Pb, 1.24% Zn and 2.42% Cu (Sample 88262; 1990).

• Holes SLM25-067 and 069 intersected zones ofclassic CRM and polymetallic veining with late fugitive calcite that are locally cross-cut and brecciated by late, mineralized pebble dykes - enhancing the target's metal endowment.

• Drill hole SLM25-068 targeted a series of sheeted, Ag-rich galena-pyrite veins hosted in a Cretaceous mafic intrusion and successfully intersected moderate-to-high density veining over 32m. Surface samples collected here in 2024 returned 216g/t Ag, 12% Pb, 0.11% Cu and 115ppm Te (F422181).

• The 2025 program demonstrates that Jackie hosts multiple high-grade silver-bearing polymetallic mineralization styles across diverse lithologies, significantly expanding its potential footprint and underscoring the target's scalability within the Blue Property. Mineralization is structurally controlled and remains open at depth and in multiple directions.

• Core silver continues its drilling campaign at the Laverdiere Skarn-Porphyry Project and will provide updates as they become available.

Core Silver's President & CEO, Nick Rodway commented "Jackie continues to demonstrate the scale and grade potential that makes the Blue Property so unique. The ability to intersect multiple styles of silver-rich mineralization at depth, directly beneath ultra-high-grade surface exposures, confirms Jackie as a highly prospective and expandable target. With the successful completion of 2025 drilling, we are further strengthening the foundation for what we believe is an emerging district-scale silver and polymetallic system capable of delivering long-term value for shareholders."

Figure 1: Photographs of high-grade silver mineralization at surface and new sulphide mineralization intersected in hole SLM25-067 (assays pending), confirming the continuation of mineralization intersected from surface in discovery hole SLM22-001.

Figure 2: Plan view geological and diamond drilling map for the Jackie Target, highlighting high-grade silver mineralization at surface.

TABLE 1: 2025 DIAMOND DRILL HOLE DATA - JACKIE TARGET
DDH ID	EASTING	NORTHING	ELEVATION (m)	TOTAL DEPTH	AZIMUTH	DIP	COMMENTS
SLM25-067	538677	6557469	1661	275	162	-60	Assays Pending
SLM25-068	538677	6557469	1661	214	167	-65	Assays Pending
SLM25-069	538677	6557469	1661	75	78	-45	Assays Pending

DIRECTOR RESIGNATION

The Company announces the resignation of Mr. Andrew Carne from the Board of Directors, effective immediately. The Board wishes to sincerely thank Mr. Carne for his valuable service and dedication and extends its best wishes in his future pursuits.

MARKETING UPDATE

Additionally, the Company is pleased to announce that it entered into an updated consulting services agreement dated effective as of October 1, 2025, with Upswitch Media Corp. ("Upswitch") to provide the Company with certain marketing and investor relations services to expand awareness of the Company's business and to communicate with the investment community.

The services may include, among other things, engaging copywriters, designing ad content and campaigns promoting the Company, providing translation services, onboarding ad campaigns with publishers, tracking, organizing and executing the services through testing and analytic studies. The services will be provided and disseminated through a variety of news and investment community on-line communications channels and may further include print publications where applicable. Upswitch will commence providing the services immediately. The total amount payable is $1,000,000 (plus GST), in four equal monthly payments of $250,000 commencing October 1, 2025.

Jeff Gillis, the principal of Upswitch, is located at 2709B 43rd Ave., Suite 1013, in the city of Vernon in the province of British Columbia and will act as primary representative and service coordinator. Mr. Gillis may be contacted at 1-604-373-5875 and info@upswitchmedia.com. To the best of the Company's knowledge, Upswitch and Mr. Gillis do not currently own securities in the capital of the Company.

ABOUT THE SILVER LIME POLYMETALLIC PROJECT

The Silver Lime Project lies in an underexplored region of northwestern British Columbia. Host rocks are primarily metasediments of the pre-Late Devonian Nisling Assemblage. These metasediments are bound to the west by the Coast Plutonic Complex, and to the east by the Llewellyn Fault. The Llewellyn Fault is a regional, metal endowed, southeast striking brittle dextral strike slip feature. Mineralization styles common along the entire length of the Llewellyn Fault are Mesothermal Au, Epithermal Au, Intrusion-Related Au, Skarn and Cu-Mo Porphyries.

The geology, mineralization and alteration observed at the Silver Lime Project are all indicative of a nearby and buried Zn-Cu-Ag-Pb-Skarn and Mo-Cu-Ag Porphyry System. Brittle to ductile high strain shear zones are common across the Blue Property, notably the Llewellyn Shear Zone and the Wann River Shear Zone. Right-lateral strike-slip faulting, most likely related to the Llewellyn Fault System, and related transfer faults are interpreted to have provided a plumbing network at the Sulphide City Porphyry Target, allowing the Sulphide City Stock and its related mineralizing hydrothermal system to generate widespread sulphide and epithermal mineralization across the Silver Lime Project. The Eocene Sulphide City System is also evidenced to have overprinted an older, Cretaceous layered mafic intrusion that outcrops at Jackie and Pike Valley.

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 of 114,074 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, statements regarding the marketing and investor relations services to be provided by Upswitch; statements regarding the potential of the Company's proven exploration model; statements regarding the potential opportunities in the Atlin Mining District; 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 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 were the key findings from Core Silver's (CCOOF) 2025 drilling program at Jackie Target?

Core Silver completed three diamond drill holes totaling 564 meters, with hole SLM25-067 intersecting sulphide mineralization over 150m and confirming mineralization continuity to 182m true depth.

What are the highest silver grades reported in Core Silver's (CCOOF) surface samples at Jackie Target?

Surface samples revealed exceptional grades of up to 1,090g/t Ag with >20% Pb, 5.73% Zn and 2.0% Cu from Sample 152027 taken in 2021.

How much is Core Silver (CCOOF) spending on marketing services with Upswitch Media?

Core Silver has entered into a $1,000,000 contract with Upswitch Media, to be paid in four monthly installments of $250,000 starting October 1, 2025.

What were the results from Core Silver's (CCOOF) 2022 drilling at Jackie Target?

The 2022 drill hole SLM22-001 intersected 21.65m of 23g/t Ag, 1.0% Zn, 1.2% Pb and 0.08% Cu from surface, including 1.25m of 215g/t Ag, 9.9% Zn, 8.9% Pb and 0.36% Cu.

What types of mineralization were found at Core Silver's (CCOOF) Jackie Target?

The Jackie Target showed multiple styles including classic CRM (carbonate replacement mineralization), polymetallic veining with late fugitive calcite, and sheeted Ag-rich galena-pyrite veins hosted in Cretaceous mafic intrusion.