• 1940 historical estimate identifies 728,000 tonnes of contained copper at 2.6% grade
• 1984 historical estimate validates earlier findings and shows potential for wider mineralization
• Exploration upside potential under modern geological understanding

GreenX Metals Ltd has announced the discovery of a historical estimate from 1940 that identifies 728,000 tonnes of contained copper (1,605 Mlbs) at an average grade of 2.6% copper within the Tannenberg Copper Project. The 1940 historical estimate was produced by the German company Mansfeldsche Kupferschieferbergbau AG (Mansfeld AG) and is based on a 95-drill hole exploration campaign carried out during the late 1930s. In addition, a later historical estimate from 1984 was produced by St Joe Exploration GmbH (St Joe), which covers a small part of the same area as the 1940 historical estimate. The St Joe's historical estimate provides further validation for the 1940 historical estimate, as it identified up to 3.45m thick mineralization straddling the Kupferschiefer and the limestone hanging wall and sandstone footwall, with consistent grades of 2.1% copper plus 25 g/t silver. The discovery of these historical estimates represents a significant breakthrough in GreenX's archive search and fundamentally supports the company's exploration hypothesis of the Tannenberg mineral system. It demonstrates that extensive copper mineralization was identified historically, but exploration at the time was constrained by the prevailing geological model, which focused solely on the thin Kupferschiefer shale. The implications are substantial, reinforcing the potential for a large-scale and high-grade brownfield copper project at Tannenberg, and underscoring the project's significance as a major European copper opportunity.

GreenX is planning a future twin drilling campaign to verify the historical estimates, in order to establish a mineral resource estimate in accordance with the JORC Code. The company is also continuing its exploration program at Tannenberg, which includes logging, assaying, and hyperspectral scanning of historical core, reprocessing and analysis of historical geophysical data, and collation of historical geological, mine development, and production data.