Business
Intent to Produce Target for Cu-Ag, Mushima North
Tertiary Minerals plc is commencing work to define a JORC-compliant Exploration Target for its silver-copper-zinc prospect, Target A1, at the Mushima North Project in Zambia, with results expected in Q1 2026. Recent drilling has intersected significant copper mineralization, including 95m at 0.41% Cu, and laboratory analysis for silver from Phase 3 drilling is also anticipated in early 2026. The company aims to produce a maiden mineral resource estimate by Q4 2026, with the Exploration Target providing guidance for future drilling and metallurgical studies. Disclaimer*
About this update from Tertiary Minerals Plc
[{"type":"text","content":"\n\n\n \n16 December 2025\nTertiary Minerals plc\n (\"Tertiary\" or the \"Company\")\n \n Intent to Produce an Exploration Target for Copper-Silver Target A1, Mushima North Project, Zambia\n \nTertiary Minerals plc (AIM: TYM) is pleased to announce that work has commenced to produce a JORC-compliant Exploration Target for Target A1 at its silver-copper-zinc prospect within the Mushima North Project (\"Mushima North\" or the \"Project\").\nMushima North is located in the prospective Iron-Oxide-Copper-Gold region of Zambia. Target A1 is a polymetallic, silver-copper-zinc prospect located 28km to the east of the historic Kalengwa copper-silver mine which is currently under redevelopment.\n\n \n\nHighlights:\n \nØ Work to produce an Exploration Target is underway and will provide a range of tonnes and grades for Target A1 and convey the exploration potential.\nØ Exploration Target to be finalised in Q1 2026 once laboratory analysis results for silver are returned from recent (Phase 3) drilling, which included the highest-grade copper intersection to date.\nØ Additional mineralogical study results due in the coming weeks.\n\n \n\n \nRichard Belcher, Managing Director of Tertiary Minerals plc, commented:\n\"We are delighted that Target A1 continues to advance forward and have decided it is time to produce a JORC-compliant Exploration Target for this prospect. This will provide us with a range of tonnes and grades and an understanding of its exploration potential. This will also provide valuable guidance on the planning of future drilling during the next field season as we work towards our goal of producing a maiden mineral resource estimate by Q4 2026.\"\n \nTarget A1\nTarget A1 was originally defined by a large copper-in-soil anomaly (3.1km by 1.7km) with copper values up to 302ppm per portable X-Ray Fluorescence (\"pXRF\") analyser associated with a 1.7km by 0.5km zinc- and coincidental 1.3km by 0.3km silver-in-soil anomaly.\nDrilling to date (3,083m) has confirmed copper, silver and zinc mineralisation over an area approximately 450m northwest-southeast and by 400m northeast-southwest and to a depth from near surface to 84m. Mineralisation remains open both to the north/northwest, south/southeast and at depth.\n \nPhase 2 drilling has intersected higher grade copper minera...