Regis Resources (ASX:RRL) identified that 4,391 ounces of gold were incorrectly reported as poured bullion on hand after final reconciliation at June 30, according to a Friday Australian bourse filing.

As a result of this error, the end-of-month cash and bullion on hand was adjusted to AU$1.18 billion from AU$1.21 billion, the company said.

In the same filing, the company said gold production at the Duketon gold project in Western Australia for fiscal 2027 is expected to be higher than fiscal 2026 and slightly skewed towards the second half of the year.

It now expects group production of 360,000 tonnes to 400,000 tonnes during fiscal 2027, with all-in sustaining costs of between AU$2,990 per share and AU$3,390 per share.

It expects to produce 240,000 to 270,000 tonnes at Duketon during the fiscal year, and 120,000 tonnes to 130,000 tonnes at the Tropicana project in Western Australia, in which it owns a 30% stake. At Tropicana, production guidance is down slightly year over year.

The company's shares fell nearly 9% in recent trading on Friday.