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B11 – First drawbell imminent

BHP’s first developed block cave

Leinster B11 is progressing the undercut phase

• The undercut and the completion of the draw-points is
expected to be completed by the end of calendar year
2022

• Ramp up will continue in 2023.

• First draw-bell firing imminent

• Seismic responses to undercutting in line with expectations
and plan

• Strong QA/QC on tunnel development and ground support

installation was a key element of ground control measures

• Caving when commenced is expected to break-through
into the old sub level cave after 2-3 years

Mined areas above 11L Planned Cave
Mined areas below 11 Planned B11 base

Chris Stone, General Manager Northern Operations
5 October 2021 8