Errington Completes Balfour Exploration Program, Underscores Growth Potential Ahead of Resource Estimate

THUNDER BAY, ON, May 27, 2026 /CNW/ - Errington Metals Corp. (TSXV: EM) ("Errington" or the "Company") is pleased to provide an update on its 2025/2026 exploration program at the Balfour mineralized zone, part of the Company's wholly owned Sudbury Basin Project. The winter program was designed to validate and refine the geometry of known mineralized zones and advance the Company's 3D geological model in support of a planned mineral resource estimate.

The Balfour area represents a new opportunity for resource growth, as it was not previously included in the historic mineral resource estimate.

Figure 1: Planview interpretations of Balfour mineralized zones and drilling. Drill holes completed at Balfour by Errington as well holes drilled previously. The expression of the mineralized zones is shown in red. Grid as UTM NAD83 Zone 11. (CNW Group/Errington Metals Corp.)

Figure 2: Cross section of Balfour mineralized zones with structural interpretation. Images from the Balfour 3D Geological Model. Fault planes in yellow. Drill collars and traces from only Errington holes: 2025 holes in white, 2026 holes in yellow. (CNW Group/Errington Metals Corp.)

Highlights

• Completed 48 diamond drill holes for a total of 13,480 metres during the 2025/2026 program at Balfour
• Integrated drilling, historic data and airborne geophysical interpretations into a refined 3D geological model to support future drill targeting and resource work
• Confirmed continuity of mineralization along strike and at depth across the Main, West and North zones, based on geological logging and visual interpretation, with 2026 assays pending.
• Step out drilling confirmed extensions to mineralized shapes and the mineralized shapes remain open both down dip and along strike

"The Balfour program highlights the potential scale and growth of our Sudbury Basin Project," stated Matthew Gollat, President and CEO of Errington Metals. "The Balfour area did not receive much attention previously with mineralized zones open in all directions. Our 2025 and 2026 drilling has improved confidence in the continuity of mineralization, refined our understanding of key structural controls, and materially advanced the geological framework required for resource development. We believe this work positions us well as we move toward a planned mineral resource estimate and continue to unlock value across the district."

An illustrative video showing the new geological interpretation and location of 2026 drill holes is available at https://vrify.com/meetings/recordings/2c90f38d-7347-458c-a0ec-cc31711435b4.

The Program

Exploration at Balfour was focused on validating and expanding known mineralized zones while improving the understanding of the structural and stratigraphic controls on mineralization.

To support drill targeting and future resource work, the Company developed a refined 3D geological model integrating results from the 2025 drilling campaign, historic drilling and interpretations from airborne geophysical surveys.

Although assay results from the 2026 drilling program remain pending, drilling completed to date indicates that the mineralized zones continue along strike and down dip and remain open for further testing. The Main Zone has been traced along the Vermillion Formation for more than 400 metres and remains open to the east, while the West Zone extends more than 350 metres eastward. Down-dip drilling of both the Main and West zones intersected mineralization supporting continuity to depths of approximately 250 metres below surface. In addition, five holes completed at the North Zone confirmed comparable styles of mineralization to those observed in the Main and West zones and extended that zone to more than 300 metres of strike length.

Both folding and faulting influence the configuration of the mineralized zones at Balfour. Bedding-parallel foliation measurements collected through routine core logging and downhole televiewer surveys from the 2025 drill holes indicate that the mineralized zones follow an east-dipping synclinal structure. Deeper holes completed in 2026, including EMB-26-070 and EMB-26-073, tested the down-dip extension but did not encounter the interpreted fold closure, indicating that the system remains open at depth. Faulting observed at Balfour is consistent with regional orientations identified at the Errington and Vermilion mineralized centres. The Company believes this structural framework is important for interpreting displacement between the Balfour North and Main zones for guiding future drill targeting, including the untested western extension of the North Zone. Other drilling targets remain further east toward the closure of regional syncline.

Previous Work at Balfour

Historically the Balfour massive sulphide zones were explored via an underground drift across 1km strike length of the Vermilion Formation plus minor surface drilling that outlined four discrete mineralized carbonate-chert horizons. The most recent exploration by Glencore in 2013 completed four diamond drill holes all intersecting sulphide mineralization demonstrating the expansion potential to the known zones.

Massive sulphides occur at the contact between the footwall volcanic and carbonate-chert, but mineralization at Balfour also includes stringer sulphides and massive sulphide fragments, locally exceeding 30cm in size.

Errington Metals has completed two drilling campaigns at Balfour testing the continuity and extensions of the known mineralized zones. The first campaign consisted of 19 drill holes for a total of 5,500m from July to September 2025. Assay results from the first campaign are given in Table 1. Thick intervals, up to 35m, of mineralization and chert-carbonate breccia at both the Main and West Zones are interpreted to reflect folding repetition of the Vermilion Horizon.

Table 1. Balfour Assay Results from the 2025 Drill Program

Area	Hole ID	From (m)	To (m)	Length (m)	Cu (%)	Zn (%)	Pb (%)	Au (g/t)	Ag (g/t)		CuEq (%)
Balfour Main	EMB-25-005	287.0	295.3	8.3	1.04	4.13	1.35	0.73	53.6	3.03
Balfour Main	EMB-25-008	346.6	350.7	4.2	0.37	7.25	3.38	0.32	92.5	3.51
Balfour Main	EMB-25-009	323.6	326.8	3.2	0.48	6.17	2.28	0.27	72.1	2.99
Balfour Main	EMB-25-009	347.3	354.6	7.2	0.11	2.70	1.08	1.01	23.7	1.76
Balfour Main	EMB-25-010	297.3	299.2	1.9	0.21	10.26	5.34	0.19	89.2	4.25
Balfour Main	EMB-25-010	315.1	327.2	12.1	0.66	8.25	2.34	0.26	62.0	3.56
Balfour Main	includes	315.1	319.0	3.9	1.59	16.32	5.93	0.47	154.2	7.72
Balfour Main	EMB-25-012	295.6	328.7	33.2	0.31	2.41	1.03	0.15	32.3	1.36
	includes	301.0	307.4	6.4	0.66	5.07	2.41	0.43	75.0	3.04
Balfour Main	EMB-25-011	266.2	277.8	11.6	0.55	1.46	0.71	0.11	37.2	1.32
	includes	274.0	277.8	3.8	0.48	2.78	0.77	0.08	29.4	1.50
	includes	266.2	269.6	3.4	1.07	0.69	0.90	0.22	72.3	1.98
Balfour Main	EMB-25-013	251.5	254.6	3.0	0.20	2.16	0.96	0.11	26.5	1.12
Balfour Main	EMB-25-015	240.6	244.0	3.5	0.08	1.89	0.90	0.06	15.3	0.81
Balfour Main	EMB-25-014	255.3	257.5	2.1	0.66	7.39	3.33	0.22	88.4	3.69
Balfour Main Upper	EMB-25-005	226.4	228.4	2.0	0.22	2.79	1.01	0.58	55.1	1.84
Balfour Main Upper	EMB-25-005	258.3	260.5	2.2	1.32	5.51	4.74	1.32	211.2	5.77
Balfour Main Upper	EMB-25-011	27.7	49.2	21.5	0.29	2.72	1.06	0.11	40.1	1.46
	includes	33.7	40.0	6.3	0.40	4.63	1.79	0.30	78.1	2.54
Balfour West	EMB-25-016	120.9	125.0	4.1	0.44	2.65	0.91	0.04	25.7	1.38
Balfour West	EMB-25-017	53.0	88.1	35.1	0.78	3.56	1.59	0.13	58.1	2.33
	includes	76.3	84.9	8.6	0.79	6.73	2.89	0.27	98.9	3.71
	includes	53.0	61.7	8.7	1.33	4.08	1.98	0.09	76.5	3.13
Balfour West	EMB-25-018	133.0	143.4	10.3	1.58	6.55	2.62	0.11	72.7	4.02
Balfour West	EMB-25-019	127.8	136.4	8.6	0.48	4.93	1.85	0.10	51.3	2.35
Balfour West	EMB-25-020	65.6	68.6	3.0	0.08	0.30	0.05	0.01	10.0	0.24
Balfour West	EMB-25-021-A	32.6	38.1	5.5	0.98	2.30	1.19	0.09	58.7	2.13
Balfour West	EMB-25-021-B	33.2	38.6	5.4	0.65	3.47	1.86	0.10	58.1	2.22
Balfour West	EMB-25-022	132.5	139.2	6.8	1.25	10.98	7.92	0.38	227.2	6.98
Balfield	EMB-25-021B	233.5	237.7	4.2	1.09	7.67	3.39	0.25	153.0	4.69

1.	Intervals reported are downhole depths. True width represents 70-100% true width as drill holes are designed perpendicular to the regional stratigraphic orientation.
2.	Cu Eq is copper equivalent calculated as Cu (%) + Zn (%) x 0.273 + Pb (%) x 0.167 + Ag (gpt) x 0.0081 + Au (gpt) x 0.6752. Metal prices used Copper $4.5/lb ($9921/tonne), Zinc $1.3/lb ($2866/tonne), Lead $0.90/lb ($1984/tonne), Gold $2500/oz, Silver $30/oz, Recoveries are set at Copper 90%, Zinc 85%, Lead 75%, Gold 75%, and Silver 75%
3.	Copper equivalent values are provided for illustrative purposes only. No allowance has been made for payability, smelter terms, refining charges, penalties, or deleterious elements.

About Errington Metals

Errington Metals Corp. is a Canadian exploration and development company focused on advancing critical and precious metals opportunities. The Company is progressing its wholly owned Sudbury Basin Project, which hosts high-grade volcanogenic massive sulphide ("VMS")-style mineralization in one of Canada's most established mining districts. Errington is advancing the project through systematic drilling, geological modelling and technical evaluation.

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 additional information, please visit www.erringtonmetals.com and sign up for email updates.

www.erringtonmetals.com

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.

Appendix 1: Drill Hole Locations (UTM NAD83 Zone 17)

Hole ID	East	North	Depth (m)	Elevation (m)	Azimuth (deg)	Dip (deg)
EMB-25-005	483300	5155000	342	267	359.75	-54.68
EMB-25-006	483300	5155000	429	267	357.03	-70.64
EMB-25-007	483560	5155060	402	267	358.09	-67.64
EMB-25-008	483560	5155060	393	267	356.41	-53.77
EMB-25-009	483455	5155030	396	267	358.62	-51.25
EMB-25-010	483547	5155122	399	267	359.96	-53.16
EMB-25-011	483455	5155080	414	267	358.32	-52.85
EMB-25-012	483375	5155015	402	267	359.73	-61.36
EMB-25-013	483430	5155130	318	267	0.59	-51.76
EMB-25-014	483480	5155180	306	267	358.18	-60.75
EMB-25-015	483300	5155050	291	267	359.82	-50.35
EMB-25-016	482845	5154990	189	263	332.14	-60.79
EMB-25-017	482850	5155050	150	263	334.40	-60.97
EMB-25-018	482889	5154959	174	263	335.30	-60.56
EMB-25-019	482910	5155020	201	263	336.14	-60.65
EMB-25-020	482890	5155075	138	263	331.41	-63.96
EMB-25-021-B	482831	5155090	294	263	329.10	-64.11
EMB-25-022	482930	5154980	189	263	334.95	-60.34
EMB-26-048	483590	5155425	300	294	0.02	-55.23
EMB-26-049A	483540	5155425	276	267	0.22	-54.85
EMB-26-050	483490	5155375	339	267	0.14	-59.93
EMB-26-051	483590	5155375	324	267	2.00	-63.34
EMB-26-052	483670	5155130	375	265	0.99	-70.45
EMB-26-053	482910	5155100	228	265	334.90	-61.3
EMB-26-054	482839	5155147	237	267	335.01	-60.12
EMB-26-055	482760	5155130	258	267	334.09	-60.18
EMB-26-056	482690	5155170	252	265	335.70	-57.58
EMB-26-057	482590	5155160	252	265	328.82	-61.36
EMB-26-058	482950	5155000	252	265	334.12	-60.36
EMB-26-059	483000	5155000	225	265	334.04	-61.35
EMB-26-060	482950	5155050	225	265	336.46	-63.09
EMB-26-061	483000	5155050	243	265	334.66	-60.97
EMB-26-062	483050	5155050	255	260	332.55	-60.8
EMB-26-063	483050	5155100	192	260	335.60	-60.2
EMB-26-064	483100	5155050	225	260	359.83	-60.6
EMB-26-065	483100	5155000	204	260	335.37	-50.55
EMB-26-066	483646	5155124	261	265	334.90	-55.08
EMB-26-067	483690	5155148	323	265	334.06	-65.11
EMB-26-068	483671	5155080	333	265	330.14	-60.5
EMB-26-069	483714	5155104	360	265	334.49	-64.78
EMB-26-070	483475	5154965	447	260	359.55	-56.37
EMB-26-071	483374	5154945	444	265	0.33	-59.51
EMB-26-072	483000	5154950	48	265	328.10	-61.43
EMB-26-072A	483000	5154950	252	265	333.66	-61.21
EMB-26-073	483015	5154900	330	265	334.95	-59.89
EMB-26-074	482910	5154900	300	265	332.02	-60.59

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.

For Further Information Please Contact: Matthew Gollat, President & CEO, Errington Metals Corp., Toll-free: 1-888-279-1157, Direct: 1-807-577-5785, [email protected]