Weatherly International said fourth-quarter production from the Tschudi copper project in Namibia rose to a record.
The project produced 4,739 tonnes of copper cathode, or 11.5% above nameplate.
"This is a record production result for Tschudi and brings year to date production to 8,843 tonnes or 4% ahead of nameplate half way through the financial year, the company said.
The outcome was assisted by some short-term benefits from relatively-fast leaching of additional oxide ore mined from an interim pit.
A more detailed operational update for the quarter will be published later in January.
At 8:28am: (LON:WTI) Weatherly International PLC share price was +0.18p at 1.45p