A preliminary economic assessment (PEA) has selected a combination of sublevel caving
and mechanized cut-and-fill as the mining methods, with a ramp serving as the primary mine access.
Highly regarded JKTech Pty Ltd have been engaged "to provide a high level study to evaluate the Mount Adrah orebody caveability and assess the potential for block or sublevel caving
methods based on geological and geotechnical criteria".
The sublevel caving
mining system is used for steep, continuous mineral deposits.
Selection of preferred mining methods tended towards non-entry methods such as block caving and sublevel caving
, allowing high levels of automation, control and monitoring, thereby minimising the number of people required to work in potentially hazardous conditions.
Bull and Chris Page  provide an excellent summary of sublevel caving
Once the mining of panel 2 on the 140m level is finished and a slot is completed from the 140L to pit bottom, sublevel caving
of the main ore body can commence later this month.
Mining will be by sublevel caving
to extract the extensive sulphide orebody beneath the current open pit.
However, in order to increase mining capacity and reduce production costs, decision has been made to change this system to sublevel caving
Ongoing stope development for sublevel caving
will produce waste rock in the amount of 25% of the ore extracted and there is no place to leave any of it underground when this mining method is employed.
is scheduled for mid August 2010 after the open pit is exploited to approximately the 1270 level.
333), the final stage of which was completed this February, and, most closely related to AutoMine, the four Toro 2500E LHDs that are now operating semi-autonomously in the Kiruna sublevel caving
When the core of the pit is exploited, sublevel caving
of the underground orebody can provide the tonnage necessary to continue to operate the Mill at the desired rate.