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NWT and Phase 5 – Open Pit Infill:

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“These results underscore the excellent growth potential within our newly acquired Canadian operations,” said Aoife McGrath, Executive Vice President, Exploration. “At New Afton, Coeur is advancing the K-Zone, one of its most compelling growth opportunities within the portfolio. Since the acquisition, exploration at K-Zone has continued to deliver strong results, confirming the existing mineral resource while extending the mineralized system well beyond the original footprint. With dedicated underground development providing access to new exploration fronts, we see considerable runway for further expansion and value creation. At Rainy River, ongoing expansion and infill drilling continue to demonstrate the opportunity to grow both underground and open-pit mineral resources, while regional programs continue to refine future drill targets. These results reinforce our confidence in extending mine life and creating long-term value at both operations.”

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New Afton Mine, British Columbia

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Coeur’s $24 million² 2026 exploration budget at New Afton includes 68 kilometers of core drilling, primarily focused on expanding and upgrading the maiden K-Zone mineral resource (see Figure 1), which was released in March 2026 with measured and indicated and inferred mineral resources of 48 million tonnes and 6 million tonnes, respectively. The additional core drilling is expected to support ongoing engineering studies related to its development.

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Since the discovery of K-Zone in late 2023, over 109 kilometers of core drilling have been completed, which has grown the deposit⁴ to more than 1,100 meters along strike and 1,100 meters vertically. The rapid progression from discovery to substantial mineral resource underscores the significant growth potential near existing underground infrastructure.

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Rainy River Mine, Ontario

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Underground Zones Extended Down-Plunge; Core of ODM Main Zone Infilled

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The $18 million² 2026 exploration budget at Rainy River is focused on growing and converting underground and open pit mineral resources, while initiating regional exploration activities. A total of approximately 64 kilometers of core drilling targeting underground mineralization is planned for full-year 2026, with 43 kilometers completed across 51 holes as of August 30, 2026. Key takeaways from the programs include:

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Expansion Drilling

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Infill Drilling

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Core drilling for the remainder of the year is expected to continue advancing these expansion and infill programs, in addition to testing for new underground mineralization between existing ore shoots.

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Near-Surface Mineralization Extended Beyond Current Open-Pit Footprint

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In 2026, a 24-hole, 3,863 meter near-surface RC drilling program successfully targeted the saddle between the planned Northwest Trend and Phase 5 pits. A total of 12 of the 24 drill holes intersected mineralization that met or exceeded expectations. The program aimed to test mineralization continuity beyond the main orebody footprint and to support the evaluation of potential pit expansions through pit optimization and strip ratio improvements.

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Additionally, regional exploration programs are in progress across Rainy River’s approximately 41,800-hectare property to evaluate mineral potential. Early-stage exploration programs underway include property-scale till sampling, geophysical surveys (mobile magnetotellurics), geological mapping, and prospecting. Results are expected to inform 2027 exploration targeting and regional core drilling.

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Ongoing success across both underground and open-pit core drilling programs reinforces Rainy River’s long-term growth potential. These programs continue to demonstrate strong mineralization continuity across key zones while supporting engineering evaluations of open-pit and underground expansion opportunities.

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About Coeur

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Coeur Mining, Inc. is a U.S.-based, well-diversified, growing precious metals producer with seven wholly-owned operations: the New Afton gold-copper mine in British Columbia, Canada, the Rainy River gold-silver mine in Ontario, Canada, the Las Chispas silver-gold mine in Sonora, Mexico, the Palmarejo gold-silver mine in Chihuahua, Mexico, the Rochester silver-gold mine in Nevada, the Kensington gold mine in Alaska and the Wharf gold mine in South Dakota. In addition, the Company wholly-owns the Silvertip polymetallic critical minerals exploration project in British Columbia, Canada.

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Cautionary Statements

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This news release contains forward-looking statements within the meaning of securities legislation in the United States and Canada, including statements regarding mineral reserve and mineral resource estimates, exploration efforts and plans, growth, mine lives, mine expansion and development plans, and resource delineation, expansion, and upgrade or conversion. Such forward-looking statements involve known and unknown risks, uncertainties, and other factors that may cause Coeur’s actual results, performance, or achievements to be materially different from any future results, performance, or achievements expressed or implied by the forward-looking statements. Such factors include, among others, the risk that anticipated additions or upgrades to reserves and resources are not attained, the risk that planned exploration programs may be curtailed or canceled due to budget constraints or other reasons, the risks and hazards inherent in the mining business (including risks inherent in developing large-scale mining projects, environmental hazards, industrial accidents, weather or geologically related conditions), changes in the market prices of gold, silver, and copper, and a sustained lower price environment, the uncertainties inherent in Coeur’s production, exploratory, and developmental activities, including risks relating to permitting and regulatory delays, ground conditions, grade and recovery variability, any future labor disputes or work stoppages, the uncertainties inherent in the estimation of mineral reserves and mineral resources, the potential effects of pandemics or epidemics, including impacts to the availability of our workforce, continued access to financing sources, government orders that may require temporary suspension of operations at one or more of our sites and effects on our suppliers or the refiners and smelters to whom the Company markets its production, changes that could result from Coeur’s future acquisition of new mining properties or businesses, the loss of any third-party smelter to which Coeur markets its production, the effects of environmental and other governmental regulations, the risks inherent in the ownership or operation of or investment in mining properties or businesses in foreign countries, Coeur’s ability to raise additional financing necessary to conduct its business, make payments, or refinance its debt, as well as other uncertainties and risk factors set out in filings made from time to time with the United States Securities and Exchange Commission and the Canadian securities regulators, including, without limitation, Coeur’s most recent reports on Form 10-K and Form 10-Q. Actual results, developments, and timetables could vary significantly from the estimates presented. Readers are cautioned not to put undue reliance on forward-looking statements. Coeur disclaims any intent or obligation to update publicly such forward-looking statements, whether as a result of new information, future events, or otherwise. Additionally, Coeur undertakes no obligation to comment on analyses, expectations, or statements made by third parties in respect of Coeur, its financial or operating results, or its securities.