Teck receives strike notice allowing work stoppage at Canada's largest copper mine on 24 October
Key Facts
Teck Resources confirmed it had received strike notice from the United Steelworkers union at its Highland Valley Copper operations, raising the prospect of a work stoppage at what the company describes as Canada's largest copper mine. The notice allows a strike to begin as early as 24 October 2026 at 8:00 a.m. Pacific time, according to Teck's statement on the labor action. The company said in the same statement that "operations at Highland Valley Copper are continuing," with a work stoppage remaining a possibility under the notice. The dispute comes at a mine whose annual and quarterly production rose in the latest comparison periods reported by the company. It also coincides with construction of a project aimed at extending the site's operating life, with capital investment estimated at billions of Canadian dollars.
Teck previously announced that Highland Valley Copper workers had ratified a collective agreement, which it said had a term of 5 years, establishing the previous framework for labor relations at the mine's operations. In a filing with the U.S. Securities and Exchange Commission, the company listed 30 September 2026 as the expiry date of the site's collective agreement. That places the current strike notice after the agreement's expiry date disclosed by the company, in the immediately following month. In preparation for potential labor action, Teck said it had drawn up contingency plans to maintain safety and environmental stewardship during that period. The company described the purpose of these plans as "maintaining safety and environmental stewardship," as part of its preparations to manage labor action at the site.
On production, Teck reported that Highland Valley Copper produced 127,100 tonnes of copper in 2025, an increase from the previous year. The mine's output stood at 102,400 tonnes in 2024, according to the annual comparison in the company's operating and financial performance report. Production continued to rise in the second quarter of 2026, when the mine recorded copper output of 42,800 tonnes, according to a quarterly filing with the U.S. Securities and Exchange Commission. Teck said output in that quarter exceeded production in the same period a year earlier by 10,400 tonnes. The prospect of labor action thus follows an annual increase in the site's production, followed by another increase in the quarterly comparison with the corresponding period.
Alongside current operations, Teck is proceeding with a mine life extension project intended to keep operations running from 2028 through 2046, according to the company's announcement approving the project. The company estimated the capital investment required for the extension at between 2.1 and 2.4 billion Canadian dollars, as part of its estimates when it decided to proceed with the project. It estimated targeted average copper production over the life of the extension project at about 132,000 tonnes annually, according to the same statement. The company's plan thus links a longer operating period with continued copper production at the site during the years covered by the project. The extension provides an investment backdrop to the current labor dispute, as potential action looms at a mine the company is working to keep operating over the targeted period.
The extension project received its environmental assessment certificate and required permits in June 2025, according to Teck's project page on development work at Highland Valley Copper. Construction then began in August 2025, moving the mine life extension plan into execution after the certificate and permits were issued. Teck wholly owns the mine, with a 100% stake, according to ownership information published on the life extension project page. The company says continued operations through the extension preserve about 1,500 direct jobs at the mine, its estimate of the jobs the project helps retain. The plan thus combines ongoing construction with continued mining activity and direct employment associated with the site's operations during the operating phase the project aims to extend.
The next milestone in Teck's disclosures comes on Thursday, 29 October 2026, when it plans to announce its third-quarter financial results before the market opens, according to its results scheduling statement. The announcement falls after the earliest date on which the union's notice allows a strike to begin, placing the labor deadline ahead of the company's upcoming quarterly disclosure. The results will cover the third quarter of 2026, following the second quarter in which Teck reported higher copper production at Highland Valley Copper compared with the same period a year earlier. As of the statement announcing receipt of the notice, operations remained ongoing while the company prepared its plans for safety and environmental stewardship during labor action. The earliest date the notice permits a potential stoppage to begin remains the morning of 24 October 2026, according to the timing announced by Teck.