Investor Presentaiton
Gwalia Production Profile - 'Centre out' method
Objective: Maximise production,
constrained by:
1)
2)
Waiting for adjacent/above stope's
paste fill to dry
Geotech considerations - not too many
open stopes too close together
= 'Centre out' method
'Centre out'
―
extract centre
stope of lode first,
then move out to
edge of lode
Maintain 3-4 mining
fronts, each as
distant from each
other as possible
13 Asia Investor Relations Roadshow / March 2016
Stope diagram of South West Branch
showing mining in Q3 & Q4 FY2015
St Barbara
LIMITED
Plunge, centre
of lode
Historical stopes
'(light blue)
Q3 FY15 Stopes
(dark blue)
Q4 FY15 Stopes
(red)
Stopes on outside of lode - generally lower grade
Stopes in centre - generally higher grade
= Variable gold production based on stopes in production that quarterView entire presentation