Hera is an underground mine utilising long-hole open stoping in a combination of bottom-up and top-down directions. The stopes are backfilled with cemented rock fill (CRF), waste rock fill or a combination of both.

The orebody is accessed from a decline located in the hangingwall. The decline has a gradient of 1:7 and production levels are nominally 25 m apart.

A typical standoff distance from the decline to the ore is 60 m. Development is undertaken by conventional drill and blast excavation techniques.

^ 3D Mine Image (April 2016) showing current mine development (grey), current Mining Inventory (blue) and areas mined to date (green)