NEWS RELEASE | Capstone Copper Announces 2026 Annual General Meeting Results Read the full release here: capstonecopper.com/news/caps… TSX:CS | ASX:CSC

Today we reported record Q1 results, providing a strong foundation for the rest of 2026 as we focus on operation excellence and progressing our organic growth projects: ✅  Quarterly copper production of 48.0kt at C1 cash costs of $2.66/lb ✅  Record adjusted EBITDA of $329 million, continuing momentum built over past six quarters ✅  Record adjusted EPS of $0.12/share, benefitting from strong commodity prices ✅  Improved net debt to $738M and net debt / TTM EBITDA to 0.7x ✅  Over $1B in available liquidity providing financial flexibility ✅  2026 production and cost guidance unchanged Join us today at 5:00 pm Eastern Time / 2:00 pm Pacific Time (Thursday, April 30, 7:00 am Australian Eastern Time) to learn more about our first quarter results. Listen to the webcast here: app.webinar.net/4QO2N17xpEG

Q1 2026 Results Webcast & Conference Call We invite investors, analysts, and stakeholders to join us for our Q1 2026 results presentation Date & Time 📅 April 29, 2026 🕔 5:00 PM ET / 2:00 PM PT 📅 April 30, 2026 🕗 7:00 AM AET Webcast Access Join the live webcast: app.webinar.net/4QO2N17xpEG 📞Phone Access Instant connection via registration: emportal.ink/40HaFo5 Or dial in directly: • Toronto: 1-437-900-0527 • Australia: 61-280-171-385 • North America Toll-Free: 1-888-510-2154

This International Women’s Day, the women of Capstone Copper share what giving means to them and how it helps build connection, opportunity, and stronger teams across our company. Because when we give, everyone gains. #InternationalWomensDay #GiveToGain Este Día Internacional de la Mujer, las mujeres de Capstone Copper comparten lo que significa para ellas dar y cómo esto ayuda a construir conexión, oportunidades y equipos más fuertes en toda nuestra compañía. Porque cuando damos, todos ganamos. #DíaInternacionalDeLaMujer #DarParaGanar

Today we reported record Q4 and full year 2025 results, closing out a transformational year for Capstone Copper and delivering strong operational and financial performance across the business: ✅ Record quarterly copper production of 58ktat record low C1 cash costs of $2.31/lb ✅ Record adjusted EBITDA of $308M, continuing momentum built over the past five quarters ✅ Record full year copper production of 225kt, with output up 22% y/y ✅ Achieved 2025 production and cost guidance ✅ Continued improvement of net debt / TTM EBITDA to 0.8x at December 31, 2025 ✅ Over $1B in available liquidity supporting continued growth 2025 marked a major step forward for Capstone Copper as we realized the benefits of completed projects while advancing the next phases of growth, including Mantoverde Optimized, Santo Domingo and expanded district exploration. Join us today at 5:00 p.m. Eastern Time / 2:00 pm Pacific Time (Tuesday, March 3, 9:00 am Australian EDT) to learn more about our fourth quarter and full year results. Listen to the webcast here: app.webinar.net/ZN9xeEYeRlz capstonecopper.com/news/caps…

Today we announced 2026 annual production, cost and capital expenditure guidance. Cashel Meagher, President and CEO of Capstone, commented, “2025 was a remarkable year for Capstone, delivering record copper production up 22% year-over-year, while executing on several key catalysts. We will continue to build on this success in 2026, with a focus on delivering consistent and reliable outcomes." capstonecopper.com/news/caps… Capstone will release its 2025 full-year results on Monday, March 2, 2026, after market close. The announcement will be followed by an investor conference call the same day at 5:00pm Eastern Time / 2:00pm Pacific Time (Tuesday, March 3, 2026, 9:00am Australian Eastern Time).

We're pleased to share that Raman Randhawa, SVP & CFO of Capstone Copper, will be speaking at the BC Critical Minerals Forum, April 14-15, Vancouver invt.io/1txbmnpvhm4

Today we reported our 2025 production results. Highlights include: ✅Achieved annual copper production guidance ✅Record annual copper production of 224,764 tonnes in 2025, a 22% increase over 2024 ✅Record quarterly copper production of 58,273 tonnes in Q4 ✅Record Mantoverde monthly copper output of 10,747 tonnes in December ✅Record Mantos Blancos quarterly copper output of 16,891 tonnes in Q4 Our full year 2025 results will be released Monday, March 2, after market close. For more details, please visit capstonecopper.com

Last week, our CEO, @CashelMeagher, delivered a keynote address at RBC’s Bringing the Diggers Down Under Conference in Sydney, Australia. Cashel discussed the role Capstone will play producing copper that the world needs for the clean energy transition. Amidst a compelling supply/demand outlook for copper, Capstone is very well positioned with permitted and executable growth opportunities. #capstonecopper #rbccapitalmarkets

Today we reported strong Q3 2025 results, achieving records in a number of areas and making progress on key catalysts: ✅ Solid copper production of 55kt at record low cash costs of $2.42/lb ✅ Record revenue up 43% y/y to $598M ✅ Record EBITDA up 106% y/y to $249M ✅ Continued improvement on net debt / TTM EBITDA of 0.9x ✅ Full year 2025 consolidated guidance reiterated ✅ Strong performance expected in Q4 Join us today at 5:00 p.m. Eastern Time / 2:00 pm Pacific Time (Friday, October 31, 8:00 am Australian AEDT) to learn about our third quarter results. Link to audio webcast: app.webinar.net/AyjB75OobRW News Release: Capstone Copper Reports Third Quarter 2025 Results capstonecopper.com/news/caps…

Capstone Copper is pleased to announce we have published our 2024 Sustainability Report titled "Concentrating on Performance" capstonecopper.com/news/caps… Read the full report: capstonecopper.com/cs-2024-s…

Capstone Copper Announces up to $360M Investment from Orion for 25% Interest in Santo Domingo capstonecopper.com/news/caps…

Capstone Copper has reported strong initial results from its 30,000-metre Phase 1 Drill Program at Mantoverde, demonstrating higher-than-expected copper grades in key sectors and extension of the mineralization to the north of the current Mantoverde pit. We look forward to advancing Phase 2 of the exploration program, which focuses on the highly prospective northern corridor of our Mantoverde concession and will continue to inform further opportunities for growth within our Mantoverde-Santo Domingo district. See the full news release here: capstonecopper.com/news/caps…

Q3 2025 Results Webcast & Conference Call 📅Oct 30, 2025 – 5PM ET / 2PM PT 📅Oct 31, 2025 – 8AM AEST 🎥Watch live: app.webinar.net/AyjB75OobRW 📞Phone access: emportal.ink/3HZ0c1v Or dial: 🇨🇦1-437-900-0527 🇦🇺61-280-171-385 🇺🇸1-888-510-2154 #capstonecopper #Q32025

Achieving The Copper Mark means meeting rigorous criteria across environmental, social, and governance due diligence practices in mineral supply chains. It reflects the work of our team and our commitment to producing responsibly and in a way the supports the communities and environments where we operate. Learn more about The Copper mark: coppermark.org More on Capstone Copper’s sustainability approach: capstonecopper.com/responsib… Link to NR: capstonecopper.com/news/caps… #thecoppermark #Mining #Copper #CapstoneCopper #ESG

In support of our commitment to responsible copper production, our Cozamin site in Mexico has officially begun The Copper Mark assurance process. With this milestone complete, all Capstone Copper sites are now participants of The Copper Mark. Learn more about our approach to responsibility capstonecopper.com/responsib… linkedin.com/feed/update/urn…

Capstone Copper has approved construction of the MV Optimized project at Mantoverde. ✔️ 20kt Cu & 6koz Au/year ✔️ Throughput: 45,000 tpd ✔️ Minelife: 25 years ✔️ Low unit costs A strong return project advancing our Chilean growth strategy. (TSX:CS) (ASX:CSC) capstonecopper.com/news/caps…

Today we reported strong Q2 2025 results Join us today at p.m. Eastern Time / pm Pacific Time (Friday, August 1, am Australian EST) to learn about our second quarter results. Link to audio webcast: app.webinar.net/JPe9pRvpkaO News Release: Capstone Copper Reports Second Quarter 2025 Results capstonecopper.com/news/caps…