Lincoln Minerals Unveils 7km Copper-Base Metals System at Minbrie

A Large-Scale Discovery Unfolds

Lincoln Minerals Limited (ASX, LML) has announced compelling new assay results that confirm a large-scale, continuous copper-zinc-lead-silver mineralised system at its Minbrie Project on South Australia's Eyre Peninsula. The mineralised strike length now exceeds 7 kilometres, a significant extension that underscores the project's potential as a major multi-metal sulphide discovery within the underexplored Gawler Craton region.

The recent assays derive from re-analysis of historic drill core originally drilled by Centrex Metals between 2002 and 2012. This core, previously targeted for iron ore, was re-examined to unlock the overlooked base metal potential beneath the Banded Iron Formation units. Lincoln’s geological team identified multiple sulphide-rich zones, with mineralisation hosted in key stratigraphic horizons such as the Upper Katunga Transitional Zone and the Mylonite Shear Zone. These zones contain disseminated chalcopyrite, bornite, sphalerite, and galena, indicating a robust polymetallic system.

Strengthening the Geological Model

The new assay results not only confirm continuity with previously reported high-grade intercepts but also reveal mineralisation remains open along strike and at depth, particularly to the north. Noteworthy intercepts include 0.3 metres at 0.18% copper, 2% zinc, and 4.6 grams per tonne silver from 451 metres in drill hole BUDD100, and 0.7 metres at 3.1% zinc and 0.46% lead from 201 metres in BUDD179. These findings reinforce the interpretation of a multi-phase sulphide system controlled by structural fluid pathways and favourable lithologies such as dolomite and calcsilicates.

Lincoln Minerals’ CEO Jonathon Trewartha highlighted the significance of these results, stating that re-assaying historic core has rapidly unlocked substantial copper, zinc, lead, and silver potential at minimal cost. The company’s refined geological model, supported by 3D modelling and geochemical data, has de-risked future drilling and sharpened targeting strategies ahead of the maiden drill program scheduled for the fourth quarter of 2025.

Strategic Location and Exploration Potential

The Minbrie Project benefits from its location within South Australia’s highly prospective Gawler Craton, a region renowned for world-class copper and base metal deposits such as Olympic Dam and Prominent Hill. The project’s mineralisation occurs at relatively shallow depths, generally less than 300 metres, making it amenable to potential open-pit mining. Proximity to key infrastructure, including regional transport routes and the Port Pirie smelter, further enhances its development prospects.

Despite extensive historic drilling focused on iron ore, much of the base metal potential remains untested, particularly in the footwall sequences beneath the BIF units. Lincoln’s work has identified multiple high-priority drill targets across the northern area, with plans to test untested extensions and thicker, higher-grade zones. The company’s data-driven approach integrates structural geology, geochemistry, and geophysical insights to optimize exploration success.

Looking Ahead

Lincoln Minerals is poised to embark on a high-impact drilling campaign in Q4 2025, aiming to validate and expand upon these promising assay results. The upcoming program will focus on confirming mineralisation continuity, delineating resource potential, and advancing the Minbrie Project toward development. This announcement marks a pivotal step in Lincoln’s strategy to unlock value from its South Australian portfolio, which also includes graphite and magnetite projects aligned with global decarbonisation trends.