The event occurred at about 4am on Friday morning.

No injuries were sustained and all personnel working in the affected area were accounted for and safely returned to surface.

Inspections have been conducted which have confirmed that past investment in ground support has been effective in preventing damage to infrastructure, with only localised damage to the roadways and ground support near the junction of two extraction drives, and minor ground support damage to a nearby ventilation rise.

Newcrest has been working with the NSW government resources regulator and a prohibition notice has been established around only the affected area.

A geotechnical report will be sent by Newcrest to the regulator today for approval to start rehabilitation activities in the affected area.

Mining operations in all other areas, development activities and above-ground operations all continued uninterrupted.

The replacement of the SAG mill motor for Concentrator 1 started today as originally planned.

Newcrest does not expect seismic event to have any impact on gold or copper production in FY22. The company is yet to release guidance for the year.

Seismicity is common in the area, with Cadia suspended for three months in 2017 after a major seismic event.

Cadia was Australia's largest gold producer in 2020, with output of 822,478 ounces.

Newcrest shares were up 1.6% to A$25.78 this morning, valuing the miner at $21 billion.