Coeur Provides Exploration Update for Palmarejo and Las Chispas

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San Miguel, La Unión and other priority targets demonstrate the scale and diversity of mineralization across the Eastern District and reinforce the broader exploration opportunity and growth potential of the region. Work at San Miguel underscores its potential as a high-grade, silver-rich epithermal vein system with strong continuity along strike and at depth, while La Unión represents a potential broader, gold-rich system characterized by stockwork veining and brecciation within a large structural corridor.

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Main Mine Trend: Continued growth along the Hidalgo Corridor

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Hidalgo, Palmarejo’s second-largest reserve after the Guadalupe deposit, which has been a key source of production since 2015, continues to emerge as a key source of near-mine growth and remains open towards the northwest. Drilling along the Hidalgo, Libertad and San Juan vein trends has added 5.8 kilometers of strike length since the initial discovery of the Hidalgo vein in 2019, including 200 meters so far in 2026. Recent results continue to demonstrate robust grades and widths across the trend, while initial review of two scout holes drilled 600 meters northwest of Libertad (assays pending – see Figure 3) show indications that the corridor may extend further. One kilometer of additional potential strike length to the northwest is expected to be tested in 2027.

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Independencia Sur

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Independencia Sur, the southeastern extension of the producing Independencia deposit (see Figures 1 and 3), represents a near-term growth opportunity located outside of the Franco-Nevada stream boundary. Drilling commenced on this property in 2024 after Coeur’s acquisition of the Fresnillo mineral claims. Recent infill and expansion drilling in the northwestern portion of the trend, which is closest to existing infrastructure, has defined three mineralized veins over approximately 950 meters of strike and 300 meters of vertical extent within a broader 1.8-kilometer structural corridor. Encouraging grades, widths and continuity support the potential for near-term reserve conversion.

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Las Chispas

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Gap Zone Emerges as a Key Growth Corridor

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The previously underexplored Gap Zone between the Babicanora and Las Chispas Blocks continues to emerge as a key growth corridor at Las Chispas (see Figure 4). Recent success in discovering and expanding veins within the Gap Zone has indicated potential continuity between the previously separate Babicanora Block and Las Chispas Block vein domains, while drilling at Augusta, La Promesa, William Tell and North Las Chispas has expanded multiple veins laterally and at depth, with several now exceeding one kilometer in strike length.

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Building on the discovery of the Augusta Vein System (see Figure 4), an accelerated program of expansion drilling that commenced in 2025 has successfully grown several veins to over one kilometer in strike, with multiple associated veins and splays discovered. Augusta contributed to year-end 2025 reserves within 12 months of discovery, underscoring the district’s rapid discovery-to-reserve conversion pathway. The system now comprises eight veins and splays with an approximate combined 4.2 kilometers of strike length and remains open along strike and at depth. Additional result highlights include (true widths):

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In 2026, exploration at Palmarejo and Las Chispas is expected to exceed 200,000 meters of scout, expansion, and infill drilling, underscoring Coeur’s continued commitment to disciplined brownfields exploration to generate new discoveries, expand known mineralized systems, and support long-term mine life extension 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 and silver, 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.