Mr. Neil Woodyer reports

ARIS MINING ANNOUNCES BREAKTHROUGH MILESTONE AT MARMATO UNDERGROUND DEVELOPMENT

Aris Mining Corp. has reached 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 the fourth quarter of 2026.

Neil Woodyer, chair and chief executive officer, 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 Corp.

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.

Qualified person

Pamela De Mark, PGeo, senior vice president geology and exploration, is a qualified person as defined by National Instrument 43-101 and has reviewed and approved the technical information contained in this news release.

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