Aris Mining Corporation (Aris Mining or the Company) (TSX:ARIS, NYSE:ARIS) announces a significant construction milestone at its Marmato gold mine with the underground development cross-cut now connecting the new surface decline to the existing underground development.

This breakthrough marks an important step in the Marmato expansion project, establishing continuous underground access from surface, where the new 5,000 tonne per day CIP plant is under construction, to the existing workings. The connection supports the next phases of mine development, infrastructure installation and operational readiness for the Marmato bulk mine which is on schedule for first gold in Q4 2026.

Neil Woodyer, Chair and CEO, commented: "The on-schedule connection of the new surface decline to the existing underground development is a major milestone for Marmato and an important step in delivering our expansion plans. As development continues to advance, Marmato, together with Segovia, remains on track to deliver approximately 500,000 ounces of gold production per year following expansion and ramp-up."

Marmato is one of Aris Mining's key growth projects and is expected to become a larger-scale, modern underground mining operation. This cross-cut breakthrough reflects continued progress in developing the access and infrastructure required to support expanded operations.

Aris Mining will continue to provide updates on construction and development progress at Marmato as additional milestones are achieved.

About Aris Mining

Aris Mining is a Canadian gold mining company focused on South America. The Company operates the Segovia and Marmato underground gold mines in Colombia, which together produced approximately 257,000 ounces of gold in 2025. Aris Mining is listed on the Toronto Stock Exchange and the New York Stock Exchange under the symbol ARIS.

The Company is advancing expansion projects at Segovia and Marmato that are expected to increase annual gold production to approximately 500,000 ounces, driven by the ramp-up at Segovia following the installation of the second mill, which was completed in June 2025, and construction of the new Marmato bulk mine and CIP plant, with first gold expected in Q4 2026.

Aris Mining's portfolio supports a longer-term objective of approximately 1 million ounces of annual gold production¹. Key projects include the high-grade Soto Norte gold project in Colombia, where environmental studies are being finalized for submission in Q2 2026 to initiate the licensing process, and the Toroparu gold project in Guyana, where a Prefeasibility Study is in progress and a construction decision is expected in early 2027.

Additional information on Aris Mining can be found at www.aris-mining.com, www.sedarplus.ca, and on www.sec.gov.

Cautionary Language

Qualified Person

Pamela De Mark, P.Geo., Senior Vice President Geology and Exploration of Aris Mining, is a Qualified Person as defined by National Instrument 43-101 (NI 43-101), and has reviewed and approved the technical information contained in this news release.

Forward-Looking Information

This news release contains "forward-looking information" or forward-looking statements" within the meaning of Canadian securities legislation. All statements included herein, other than statements of historical fact, including, without limitation, statements relating to timing for completion and first gold pour at the Marmato Bulk Mining Zone, the expected benefit from the Segovia expansion, the timeline for environmental studies for the Soto Norte Project, the timeline for a Prefeasibility Study and construction decision for the Toroparu Project, the objective of reaching one 1 million ounces of production and potential production, are forward-looking. Generally, the forward-looking information and forward looking statements can be identified by the use of forward looking terminology such as "plans", "expects" or "does not expect", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate", "will continue" or "believes", or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved". The material factors or assumptions used to develop forward looking information or statements are disclosed throughout this news release.

Forward looking information and forward looking statements, while based on management's best estimates and assumptions, are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of Aris Mining to be materially different from those expressed or implied by such forward-looking information or forward looking statements, including but not limited to those factors discussed in the section entitled "Risk Factors" in Aris Mining's annual information form dated March 11, 2026 which is available on SEDAR+ at www.sedarplus.ca and included as part of the Company's Annual report on Form 40-F, filed with the SEC at www.sec.gov.

Although Aris Mining has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking information and forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such information or statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such information or statements. The Company has and continues to disclose in its Management's Discussion and Analysis and other publicly filed documents, changes to material factors or assumptions underlying the forward-looking information and forward-looking statements and to the validity of the information, in the period the changes occur. The forward-looking statements and forward-looking information are made as of the date hereof and Aris Mining disclaims any obligation to update any such factors or to publicly announce the result of any revisions to any of the forward-looking statements or forward-looking information contained herein to reflect future results. Accordingly, readers should not place undue reliance on forward-looking statements and information.

¹ Includes potential production estimates from Toroparu, which is based on a preliminary economic assessment and is preliminary in nature. It includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and there is no certainty that the preliminary economic assessment will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability. There can be no assurance that the projected production will be achieved. Such production also remains subject to obtaining all necessary permits for both Soto Norte and Toroparu.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260417623233/en/

Aris Mining Contact

Oliver Dachsel

Senior Vice President, Capital Markets

+1.917.847.0063

Lillian Chow

Director, Investor Relations & Communications

info@aris-mining.com

Aris Mining Announces Breakthrough Milestone at Marmato Underground Development