Errington Metals Further Defines Continuity and Expansion Potential at Errington Zone with 2025 Drilling

THUNDER BAY, ON, May 4, 2026 /CNW/ - Errington Metals Corp. (TSXV: EM) ("Errington" or the "Company") is pleased to share results from its 2025 drilling program at the Errington mineralized zone, part of the Company's Sudbury Basin Project. The program was designed to better define the size and shape of the mineralized zones in order to support a future mineral resource estimate.

Highlights

• The Errington mineralized zone remains open along strike and at depth (down-dip) with priority areas identified for follow-up exploration drilling
• Multiple holes intersected copper- and gold-rich stringer mineralization, as well as elevated copper values within zinc-rich massive sulphide intervals.
• Key Significant Drill Intercepts from 2025 drill program include:
  • 23.8 m grading 3.98% Cu, 5.76% Zn, 1.64% Pb, 2.61 g/t Au and 130.2 g/t Ag in EME-25-035
  • 24.4 m grading 1.65% Cu, 3.43% Zn, 1.84% Pb, 1.26 g/t Au and 105.7 g/t Ag in EME-25-029
  • 33.2 m grading 1.43% Cu, 4.30% Zn, 0.97% Pb, 1.41 g/t Au and 59.7 g/t Ag in EME-25-030
  • 31.8 m grading 1.32% Cu, 2.44 % Zn, %1.76 Pb, 0.34 g/t Au and 77.0 g/t Ag in EME-25-045
• Extensions to mineralization were found in areas with limited historic drilling
• Results improve confidence in the continuity of mineralization and will feed into 3D geological modelling and an updated mineral resource estimate targeted for H2 2026

"These results are an important step in tightening our geological model at Errington," stated Frank Santaguida, Vice President, Exploration of Errington Metals. "The 2025 program combined targeted step-outs and local infill to improve our confidence in continuity, clarify key structural controls such as the Christie Fault, and to better define the styles of mineralization that relate to higher grades and potentially define our ore types. This work will feed directly into current 3D modelling and our planned mineral resource estimate in H2 2026."

An illustrative video of these drill results can be view by following https://vrify.com/meetings/recordings/a4c74ffc-fa9b-4583-baed-d9895e33f257.

The Program

In late 2025, Errington completed a diamond drilling program at the Errington mineralized zone (See Figure 1) to validate historic work and refine geological interpretations for a new mineral resource estimate. Assays for this drilling are reported in Table 1 below

The drill program included 16 diamond drill holes totaling 4,172 metres. Drilling focused on areas with relatively limited historic drilling (see Figure 2), especially where previous geological interpretations constrained the mineralized zone.

Previous surface drilling largely confirmed mineralization known from historic underground work; however, some areas had limited drill density and key structural features (faults and folds) were not fully constrained, leaving parts of the system under-tested. The 2025 program targeted these gaps with holes aimed at better defining the structural geometry and continuity of the mineralized zones.  Several examples of this opportunity exist, including the upper part of the Errington zone, where the mineralized horizon is folded. Several areas near the fold hinge had not been drilled, creating an opportunity to expand the interpreted mineralized footprint. In addition, some historic drilling was completed down-dip, which minimizes the zone's true thickness in places; the 2025 drilling helps address this by testing across the horizon from south to north.

The program intersected several thicker mineralized intervals, strengthening the dataset for 3D geological interpretation and future resource modelling (see representative Sections 1 to 3 below). Drilling also improved the Company's understanding of displacement along the Christie Fault, which offsets the mineralized horizon.  Drilling remains relatively sparse north of the Christie Fault, however mineralized intersections in historic drill holes highlight additional targets for follow-up.

In several holes, the Company intersected copper and gold-rich mineralization as chalcopyrite stringers and bands (typically associated with feeder-style mineralization in VMS-type deposits) that appear to continue for more than 100 metres along strike. Elsewhere, higher copper values occur within the zinc-rich massive sulphide mineralization, highlighting the polymetallic nature of the system and multiple mineralization styles that may reflect different ore types for mining and processing.

The drilling also intersected zones of massive pyrite with lower base-metal grades but containing elevated gold and silver. These zones occur adjacent to the copper-zinc-lead massive sulphides and may reflect metal zonation within the broader VMS system. This gold-silver style of mineralization was not a main focus of earlier work and could represent additional upside for expanding known zones, defining new target areas, and metallurgical optimization and planning.

The Background and History

Errington is one of three mineralized centres within the Company's Sudbury Basin Project. Mineralization at all three is stratabound and widely considered to be Volcanogenic Massive Sulphide type — a deposit type that commonly forms as sulphide lenses and associated stringer zones within volcanic rocks and can host copper and zinc, with meaningful gold and silver credits.

Glencore prepared a historical mineral resource estimate for Errington and Vermilion in 2013 and reported updated historical estimates annually through 2024, as summarized in Table 2.  A "qualified person" (as defined in National Instrument 43-101 – Standards of Disclosure for Mineral Projects ("NI 43-101") has not done sufficient work to classify the historical estimate as current mineral resources, and Errington is not treating the historical estimate as current mineral resources. See notes to table 2 below.

Errington Metals has evaluated the data used for the historical resource estimate and has published a Technical Report titled "Technical Report – Sudbury Basin Project" dated April 2, 2026. No mineral reserve estimates have been made publicly available for the Errington and Vermilion deposits.

At Errington, mineralization occurs as sulphide minerals that contain copper, zinc, lead, gold, and silver. The minerals occur in different styles and levels within the system. At Errington, higher copper and gold grades occur both within massive sulphide intervals, locally comprising more than 60% sulphide minerals, and within stringer-style or feeder-style mineralization. (see pictures 1 & 2 below). Ongoing mineralogy and metallurgy studies from the Errington mineralized zone are intended to better understand metal distribution, key sulphide minerals, and implications for future processing.

The Errington mineralized centre includes three main zones — Main, West, and 1500 — which are interpreted to represent discrete offset segments of the same mineralized horizon.

Folding and faulting have shifted and repeated parts of the rock sequence at Errington, which have displaced the mineralized horizon. One important structure, the Christie Fault, offsets part of the Errington Main Zone. Constraining the extent of this offset is important for targeting potential repetitions or extensions of mineralization on either side of the fault.

About Errington Metals

Errington Metals Corp. is a focused Canadian exploration and development company targeting critical and precious metals. The Company is advancing its wholly-owned Sudbury Basin Project, which hosts high–grade volcanogenic massive sulphide ("VMS")–style mineralization in the world–renowned Sudbury mining district. Errington Metals aims to efficiently assess this opportunity and advance high-quality targets through systematic drilling and technical studies.

In 2026, the Company is completing a 45,000–metre drill program designed to support an initial mineral resource estimate and test regional targets.

For further information about the company please visit www.erringtonmetals.com and sign up for email updates.

QAQC Procedures

Core samples are collected and handled using typical industry standards. Sampling, core-cutting and submission to the assay lab were conducted and supervised by Errington Metals personnel. Assay lab results have been verified by Errington Metals via Certified Reference Material standards, blanks and field duplicates. Samples were submitted to either ALS Canada in Sudbury Ontario or MSALABS in Timmins, Ontario who both meet the guidelines of ISO17025 accreditation and ISO9001, ISO14001 and ISO45001 certification. Analyses of internal reference material standards were concurrently analysed by the labs are also reported and certified. Samples are digested using a four-acid solution and analysed using a combination of ICP-MS and ICP-AES methods. Gold is independently analysed using a 30g sample by fire assay methods.

Qualified Person

The scientific and technical information in this press release has been reviewed and approved by Frank Santaguida, PhD., P.Geo. Mr. Santaguida is Vice President, Exploration for Errington Metals Corp. and is a qualified person under National Instrument 43-101.

Cautionary Note Regarding Forward-Looking Information

This news release contains forward-looking statements and forward-looking information (collectively, "forward-looking statements") within the meaning of applicable securities laws. Any statements that are contained in this news release that are not statements of historical fact may be deemed to be forward-looking statements. Forward-looking statements are often identified by terms such as "may", "should", "anticipate", "will", "estimates", "believes", "intends" "expects" and similar expressions which are intended to identify forward-looking statements. More particularly and without limitation, this news release contains forward-looking statements that include, but are not limited to, statements regarding the Company's planned 2026 drill program, the timing and potential completion of a mineral resource estimate, exploration targets, geological interpretations, metallurgical studies, and the potential advancement of the Sudbury Basin Project.

Forward-looking statements are inherently uncertain, and the actual performance may be affected by a number of material factors, assumptions and expectations, many of which are beyond the control of the Company, including expectations and assumptions concerning the Company and the Project. Readers are cautioned that assumptions used in the preparation of any forward-looking statements may prove to be incorrect. Events or circumstances may cause actual results to differ materially from those predicted as a result of numerous known and unknown risks, uncertainties and other factors, many of which are beyond the control of the Company. Readers are further cautioned not to place undue reliance on any forward-looking statements, as such information, although considered reasonable by the management of the Company at the time of preparation, may prove to be incorrect and actual results may differ materially from those anticipated. Additional information, including risks relating to the Transaction as well as risks facing the Company, are outlined in the Filing Statement prepared in connection with the Transaction.

The forward-looking statements contained in this news release are made as of the date of this news release and are expressly qualified by the foregoing cautionary statement. Except as expressly required by securities law, the Company does not undertake any obligation to update publicly or to revise any of the included forward-looking statements, whether as a result of new information, future events or otherwise.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release. No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained herein.

SOURCE Errington Metals Corp.

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