Adventus Mining Corporation provided results from its maiden drill hole that is part of a 5,000-metre scout drilling program on the Rathkeale block in County Limerick of the Republic of Ireland. The program is designed to target the prospective base of Waulsortian equivalent limestone (WRF) for zinc-lead mineralization in specific areas with limited historical drilling in a favourable structural-stratigraphic setting for Irish-type zinc-lead deposits. Drilling is being completed under an earn-in agreement with a wholly owned subsidiary of South32 Limited (South32), which has a right to acquire a 70% interest in the Kingscourt, Rathkeale and Fermoy blocks that are 100% owned by Adventus Mining through its wholly owned subsidiary, Adventus Zinc Ireland Limited ("AZIL").

Drill Holele 21-3368-01 The first scout drill hole in the program, 21-3368-01, was completed in February 2022. Prior to drilling, the target area was considered to be in the hanging wall of the GB fault, close to an original 2018 seismic target (Attyflin) developed by Adventus Mining and its technical consultants, Aurum Exploration Limited ("Aurum"). Drill hole 21-3368-01 targeted an area of anomalous lithogeochemistry (hydrothermal pyrite and barite signature) and a conductive feature identified in ground magneto-telluric (MT) geophysical data associated with a key structure (the GB Fault) in a previously undrilled part of the prospective Limerick Basin.

The drilling platform is 1.5 kilometres from the seismic line ADV17-01 that provided crucial seismic interpretation of the stratigraphy, but when integrated with the ground MT geophysical data, it aided substantively to Adventus Mining's structural interpretation that drove targeting to this location at Killeen. At an in-hole depth of 830 metres, drill hole 21-3368-01 intersected a 209 metre-wide zone of weak to moderate, zinc- lead, sulphide mineralization associated with extensive hydrothermal alteration that straddles the contact between igneous-related breccia units and the WRF. The mineralization is for the most part hosted within a large, previously unknown, sequence of igneous-related breccia units on the north side of the GB fault.