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Today's results include silver assays, which add to the zinc and lead results announced in June this year.
They also include zinc, lead and silver assays for 14 new holes, the company said.
Three months ago, the company unveiled significant new zinc, lead and/or silver mineralisation in 11 out of 16 holes near Zone 5 - one of the areas, which comprises the current mineral resources, and which showed important extensions to the mineralised zone.
The company told investors that "significant" widths and grades of zinc, lead and/or silver mineralisation were encountered in 11 of the 14 new holes.
And each of the new holes was drilled outside the currently defined mineral resource, which indicates the excellent potential to increase mineral resources with additional drilling, the firm added.
Rathdowney's president and chief executive Robert Konski said on Tuesday: "The Olza team has done an outstanding job to advance the drilling programme.
"Importantly, the assay results continue to confirm strong intervals of zinc-lead-silver mineralization as well as providing valuable data for our ongoing engineering studies.
"We look forward to receiving the additional results and updating the mineral resource estimate."
Meanwhile, key geotechnical data is also being collected from each hole for engineering studies to assess sites for infrastructure development.
In addition, hydrogeological studies and environmental programmes to support permitting are progressing, Rathdowney said.
Shares gained 11.11% to C$0.15 at 1:28 p.m. in Toronto.