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Drilling Commences at Target A1, Mushima North
Tertiary Minerals plc has commenced a significant 4,000-meter Reverse Circulation drilling program at its Target A1 silver oxide discovery within the Mushima North Project in Zambia, aiming to extend oxide mineralization, infill for a Mineral Resource Estimate, and test new targets. The company previously reported an Exploration Target at Target A1 of 15 to 30 million tonnes with a mean grade of 40-60 g/t silver equivalent, potentially representing up to 58 million ounces of silver equivalent. This program is the largest planned by the company in Zambia to date and will involve on-site preliminary analysis with selected samples sent for independent assaying, with initial results expected in six to eight weeks. Disclaimer*
About this update from Tertiary Minerals Plc
("Tertiary" or the "Company") 25 June 2026 Drilling Commences at Target A1, Mushima North Project, Zambia Tertiary Minerals plc (AIM: TYM) is pleased to announce commencement of drilling at its Target A1 silver oxide discovery, Mushima North Project ("Mushima North" or the "Project"), Zambia. Mushima North is located in the prospective Iron-Oxide-Copper-Gold region of Zambia and Target A1 is located 28km to the east of the historic Kalengwa Copper (-Silver) Mine which is currently under redevelopment. Highlights: Ø Planned Reverse Circulation drill programme of approximately 4,000m now underway. Ø Drilling will test: o Oxide mineralisation extensions at Target A1, o Infill drilling to support the Mineral Resource Estimate at Target A1, and o Initial drill testing of Target A1 west and Target A2. Ø The aim of the drilling is to enable the delineation of a JORC Mineral Resource Estimate for Target A1 where the Company has already reported a JORC Exploration Target of between 15 and 30 million tonnes with a mean grade of 40-60 g/t silver equivalent. Richard Belcher, Managing Director of Tertiary Minerals plc, commented: "We are very excited to again be drilling at Target A1 where we currently have a JORC Exploration Target of up to 58 Moz silver equivalent. This is the largest planned drill programme by the Company in Zambia to date with the aim to not only support the definition of a Mineral Resource Estimate at Target A1, but also test possible extensions of the mineralisation. "Drilling is now underway and we are undertaking preliminary analysis of the drill chip samples on-site with a portable X-Ray Fluorescence analyser prior to submission of selected samples to an external laboratory for independent analysis. Sample batches will be submitted to the external laboratory on a regular basis with the first batch planned in the next week. "I look forward to providing further updates as the drill programme continues." Drilling Programme A programme of approximately 4,000m Reverse Circulation ("RC") drilling is planned as a series of east-west drill lines spaced approximately 100m apart (north-south). Holes will be collared approximately 50m apart along the east-west lines and drilled to vertical depth of up to approximately ...
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