Notice of incident

UPDATE October 3, 2025:

Normal operations have resumed and are stable. Flaring ended at approximately 12 noon yesterday.

More information on flaring: Gases are generated during the high temperature process of converting coal into coke. This gas is referred to as coke oven gas. Typically, this gas is captured, cleaned, then reused as fuel in the coke plant. Flaring is when the gas is ignited at the battery bleeder stack which combusts the gas and is done as a means of environmental control and safety. The dark orange flare is the burning of the gas. Coke plant flare emissions are mostly composed of nitrogen, followed by oxygen, carbon dioxide and moisture. Less than 1% of emissions from the bleeder stacks are composed of fine particulate matter, sulphur dioxide, nitrogen oxides, and carbon monoxide.

 

ORIGINAL POST September 30, 2025:

Urgent maintenance in our Coke Plant off gas systems has required Coke Oven Gas from No.2 Coke Plant to be flared which produces additional dark orange flames that may be visible to community members.

The flaring process is controlled and monitored by our teams and the Ontario Ministry of the Environment, Conservation and Parks has been notified of this activity. The flaring is anticipated to continue throughout most of the week (week of September 29, 2025) as the maintenance work is expected to continue longer than initially expected. Our teams are working to complete the work to resume normal operations and the company will provide a subsequent notice when the work is complete and flaring stopped.

About ArcelorMittal Dofasco

About ArcelorMittal Dofasco ArcelorMittal Dofasco is Canada’s largest producer of flat carbon steel and is part of the world’s largest steel and mining company. Headquartered in Hamilton, ON, with more than 4,500 employees each year we ship 4.5 million net tons of high-quality flat carbon steel to partners in automotive, energy, packaging and construction which are used in increasingly lighter, stronger and more sustainable products – from cans to cars. Our purpose is to produce ever smarter steels that have a positive benefit for people and planet. High performance steels made using innovative processes which use less energy, emit significantly less carbon and reduce costs. Steels that are cleaner, stronger and reusable. With steel at our core, our inventive people and an entrepreneurial culture at heart, we will support the world in making that change. This is what we believe it takes to be the steel company of the future. For more information about ArcelorMittal Dofasco, please visit: http://dofasco.arcelormittal.com/

ArcelorMittal Dofasco
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