Mr. Matthew Gollat reports

ERRINGTON METALS BEGINS TRADING ON TSX VENTURE EXCHANGE, LAUNCHES MAJOR EXPLORATION PROGRAM IN THE SUDBURY BASIN

Errington Metals Corp.'s common shares will begin trading today on the TSX Venture Exchange, marking a major milestone in the company's growth and unlocking the next phase of value creation at its flagship Sudbury basin project.

Highlights

• First day of trading under the symbol TSX-V: EM;
• Major exploration program under way with 45,000-plus-metre drill campaign through 2026, the first program in the Sudbury basin in over 10 years;
• Focused on resource expansion and discovery of new Cu, Zn, Au, Ag, VMS (copper, zinc, gold, silver, volcanogenic massive sulphide) type mineralization;
• Initial mineral resource estimate planned for H2 2026;
• Positioned for growth.

With a strong technical foundation, a clear exploration strategy and a mineral project in a premier Canadian mining jurisdiction, Errington Metals is entering the public markets at what management believes is an inflection point for the potential for discovery and growth.

"Our listing marks the beginning of an exciting new chapter for Errington Metals," said Matthew Gollat, president and chief executive officer. "We have been hard at work over the past year, advancing a high-quality project with grade and scale potential, plus what we believe to be significant upside potential in a district that has supported mining for more than a century. The Sudbury basin still has many stories left to tell -- and we intend to help write the next one."

A district-scale opportunity with a proven foundation

Errington Metals is focused on advancing a growing, high-grade copper-zinc-gold-silver project located in the heart of one of the world's most celebrated mining districts. While the Sudbury, Ont., district is globally significant for nickel and copper production, the company believes high-quality volcanogenic massive sulphide (VMS) type mineralization has been historically overlooked. Errington believes this presents a unique opportunity to grow the existing known mineralized centres within the Sudbury basin project and with the potential to make meaningful new discoveries in a proven jurisdiction where some of the top mining companies are active within Canada.

The company controls a substantial land position encompassing three historically known mineralized centres: Errington, Vermilion and Balfour. Recent drilling has confirmed the presence of wide, continuous zones of copper-, zinc-, gold- and silver-rich mineralization that remain open for expansion in multiple directions.

The most recent exploration campaign, completed over 75,000 metres of drilling by a Xstrata (Glencore) between 2011 and 2014, demonstrated that mineralization is continuous and remained open. Importantly, much of this work was stopped short with the zones drilled to relatively shallow depths of less than 400 metres, creating what Errington sees as a compelling opportunity to build upon and advance the project with a refreshed view.

Historical resources

In 2013, Glencore prepared a historical mineral resource estimate for Errington and Vermilion and has reported the estimates annually to 2024; presented in Table 1. A qualified person (as defined in National Instrument 43-101 -- Standards of Disclosure for Mineral Projects) 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 1.

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.

Major exploration and metallurgical programs under way

Errington Metals is operating an aggressive exploration program including a 45,000-plus-metre diamond drilling program. The program is designed to:

• Expand the known zones of mineralization;
• Test high-priority target areas identified from geophysical surveys and historic data;
• Support the company's first mineral resource estimate.

Drilling will focus primarily on both the Errington and Balfour areas, where multiple mineralized zones remain open both along strike and at depth. Since the historic mineral resources did not include Balfour, the current program aims to show the continuity of this mineralization with the goal to include in the upcoming mineral resource estimate. In addition, ground geophysical surveys and 3-D geological modelling are also being used to guide drilling and identify new targets beneath cover.

Errington Metals has also successfully completed the first phase of its metallurgical test program planned for 2026, which focused on improving the company's understanding of mineralogy across the project. This work has established a strong technical foundation and confirmed key characteristics of the mineralized zones. Building on these results, the company has now initiated additional metallurgical studies aimed at evaluating the milling and recovery characteristics of the mineralized zones. A key directive of the processing studies targets the precious-metal content of the mineralization; an aspect of the project that has not previously been systematically assessed.

Gold and silver mineralization occur throughout the mineralized system and their recoveries have not been optimized but have the potential to meaningfully enhance the project's overall profile. Management believes that a focused and disciplined evaluation of precious-metal recovery represents an important new opportunity to unlock additional potential that has been previously unrealized. The ongoing work is designed to develop a comprehensive understanding of this potential as well as optimizing the overall metallurgical profile, with results expected to inform future flowsheet development and resource advancement activities.

Investor resources and additional information

The company would like to encourage all investors and interested parties to please visit the Errington website to download the company's technical report, review the interactive project presentation for more information and sign up to Errington's e-mail list to keep up to date on its progress.

Qualified person for technical information

The scientific and technical information in this press release has been reviewed and approved by Frank Santaguida, PhD, PGeo. Dr. Santaguida is vice-president, exploration, for Errington Metals and is a qualified person under National Instrument 43-101.

About Errington Metals Corp.

Errington Metals is a focused exploration and development company specializing in critical and precious metals in Canada. The company is advancing its wholly owned Sudbury basin project containing high-grade volcanogenic-massive-sulphide-(VMS)-style mineralization, located in the heart of the world-renowned Sudbury mining district. Errington Metals aims to quickly assess this underappreciated opportunity and is uniquely positioned to make additional new, high-quality VMS discoveries.

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

We seek Safe Harbor.