Copper Mountain Mining Publishes 2022 ESG Report

VANCOUVER, June 1, 2023 - Copper Mountain Mining Corp. (TSX: CMMC) (ASX: C6C) (the "Company" or "Copper Mountain") is pleased to announce the release of its 2022 Environmental, Social and Governance Report the ("2022 ESG Report"). The 2022 ESG Report highlights the achievements of Copper Mountain's sustainability program, demonstrating the Company's progress toward meeting its ESG targets and affirming its dedication to sustainable practices.

"Our 2022 ESG Report outlines the advances we have made in performing to best-in-class industry standards and pursuing innovative solutions to mitigate climate impact and create a lower-emissions future," stated Gil Clausen, Copper Mountain's President and CEO. "Our Company has grown on a strong foundation of ESG principles, and we have continuously worked to incorporate these principles into the safe and sustainable production of copper."

The 2022 ESG Report reflects the progress the Company has made since the issuance of its 2021 inaugural ESG report and provides an overview of its performance with respect to key ESG components, including energy and greenhouse gas ("GHG") emissions, reclamation and biodiversity, tailings management, water stewardship, and community support.

• Maintained the Company's commitment to reducing energy consumption and GHG emissions - on track to achieve its target of reducing its carbon intensity by 47% in 2025 compared to 2019 levels.
• Sourced 63% of energy from low-carbon electricity and only 37% from fuel in 2022, a significant reduction from prior years.
• Improved Lost Time Injury Frequency rate by 49% to 0.43, compared to 2021.
• Achieved the Company's second-lowest Total Injury Frequency ("TIF") rate of 18.5 in 2022, following the achievement of a record low TIF rate of 17.0 in 2021.
• Decreased freshwater use by 67% and decreased water discharged by 97% in 2022 compared to 2019 baseline levels.
• Exceeded the Company's 2022 target of 25% of new hires identifying as female, achieving 26%, and increased the target for 2023 to 30%.
• Surpassed the Company's commitment to have at least 30% female representation on its board by achieving 38% female board representation.
• Met or exceeded all sustainability targets, which were to achieve a "Yes" or at least an "A" rating on each of the Mining Association of Canada's Towards Sustainable Mining protocols.

The 2022 ESG Report and further information about Copper Mountain's ESG initiatives are available on the Company's website at www.CuMtn.com.

Copper Mountain owns 75% of the Copper Mountain Mine, which is located in southern British Columbia near the town of Princeton. The Copper Mountain Mine produces approximately 100 million pounds of copper equivalent on average per year. Copper Mountain trades on the Toronto Stock Exchange under the symbol "CMMC" and Australian Stock Exchange under the symbol "C6C".

Additional information is available on the Company's web page at www.CuMtn.com.

On behalf of the Board of

Copper Mountain Mining Corp.

"Gil Clausen"

Gil Clausen
President and Chief Executive Officer

This news release may contain "forward looking information" within the meaning of Canadian securities legislation and "forward-looking statements" within the meaning of the United States Private Securities Litigation Reform Act of 1995 (collectively, "forward-looking statements"). These forward-looking statements are made as of the date of this news release and Copper Mountain does not intend, and does not assume any obligation, to update these forward-looking statements, whether as a result of new information, future events or otherwise, except as required under applicable securities legislation.

All statements, other than statements of historical facts, are forward-looking statements. Generally, forward-looking statements relate to future events or future performance and reflect Copper Mountain's expectations or beliefs regarding future events.

In certain circumstances, forward-looking statements can be identified by, but are not limited to, statements which use terminology such as "plans", "expects", "estimates", "intends", "anticipates", "believes", "forecasts", "guidance", scheduled", "target" or variations of such words, or statements that certain actions, events or results "may", "could", "would", "might", "occur" or "be achieved" or the negative of these terms or comparable terminology. In this news release, certain forward-looking statements are identified, including the Company's commitment to reducing its energy consumption and GHG emissions, the Company's goal of reducing its carbon intensity by 45% in 2025 compared to 2019 levels , anticipated production at the Copper Mountain Mine, and expectations for other economic, business and/or competitive factors. Forward-looking statements involve known and unknown risks, uncertainties and other factors that could cause actual results, performance, achievements and opportunities to differ materially from those implied by such forward-looking statements. Factors that could cause actual results to differ materially from these forward-looking statements include, among others, the successful exploration of the Company's property in Canada, market price, continued availability of capital and financing and general economic, market or business conditions, the Company's ability to comply with its financial covenants under its bond terms and meet its future cash commitments, extreme weather events, material and labour shortages, the protection of the Company's IT systems or a component of such systems impacting the Company's reputation and results of operations, the reliability of the historical data referenced in this document and risks set out in Copper Mountain's public documents, including the management's discussion and analysis for the quarter ended March 31, 2023 and the annual information form dated March 27, 2023, each filed on SEDAR under the Company's issuer profile at www.sedar.com. Although Copper Mountain has attempted to identify important factors that could cause the Company's actual results, performance, achievements and opportunities to differ materially from those described in its forward-looking statements, there may be other factors that cause the Company's results, performance, achievements and opportunities not to be as anticipated, estimated or intended. While the Company believes that the information and assumptions used in preparing the forward-looking statements are reasonable, undue reliance should not be placed on these statements, which only apply as of the date of this news release, and no assurance can be given that such events will occur in the disclosed time frames or at all. Accordingly, readers should not place undue reliance on the Company's forward-looking statements.

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SOURCE Copper Mountain Mining Corp.