Tertiary Minerals plc announced the approval of the Environmental Project Brief ("EPB") for its Mupala Copper Project (32139-HQ-LEL or the "Licence") which now clears the way for the start of mineral exploration activities at Mupala. The Mupala Copper Project is located 12 km west of the Company's Mukai Project and adjacent to the Anglo American/Arc Minerals joint venture project where Anglo American has a right to earn a 70% interest through expenditure of $88.5 million. Located in the prospective Domes Region of northwest Zambia on the west side of the Kabompo Dome which is host to multiple producing copper and nickel mines including First Quantum Mineral's Sentinel mining complex which adjoins the Company's Mukai Project.

Letter of Consent received from Sailunga Chiefdom during tribal engagement conducted in February 2024 and EPB approval now received from the Zambia Environmental Management Agency. Recently acquired historical data has identified multiple copper-in-soil anomalies within the Licence. Work programmes expected to commence next month and will include soil sampling across the Licence to verify the identified soil anomalies and assist with surface regolith mapping.