GreenX Metals (LSE:GRX) has announced an Exploration Target for the Tannenberg Copper Project, in Germany, of 144-279 million tonnes (at 0.9-1.4% copper and 15-21 grams per tonne silver), equating to 1.3-3.9 million tonnes of contained copper and 69-188 million ounces of silver.
The company says the target adopts a modern Kupferschiefer model that captures hanging‑wall and footwall mineralisation beyond the thin shale horizon used in the 1940 historical estimate, and mirrors Polish KGHM operations where up to 95% of mineable copper is hosted in the same hanging‑wall and footwall units.
"Today's Exploration Target at Tannenberg is a result of 18 months of archive data search and synthesis and marks an inflection point as we transition to ramping up our own exploration programmes," GreenX CEO Ben Stoikovich said.
GreenX said it validated the target by relogging 4,389 m of archived core and assaying 2,368 new samples, and by integrating historical datasets from 1930s drilling and 1980s St Joe work that reported thicker intercepts than the 1940 shale‑only model.
The Exploration Target was prepared under the JORC 2012 framework but remains conceptual in nature, meanwhile GreenX noted that there's currently insufficient exploration to classify the target as a Mineral Resource.
Planned next steps include desktop metallurgical work and seismic evaluation in Q2 2026, access to historical underground workings in H2 2026 for scoping‑level test work, and an initial drill programme slated to commence late 2026.
