48 slides from St. Barbara's technical presentation, Jun 6, 2007
Slide 1: Gwalia Deeps Development Presentation
St Barbara St Barbara Limited ACN 009 165 066 Level 21, 90 Collins Street, Melbourne Vic 3000 Telephone +61 3 8660 1900 Facsimile +61 3 8660 1999 Email meibourne@stharbara.comau Website www stbarbara.com au Gwalia Deeps Development Presentation We attach a copy of a presentation titled Gwalia Deeps
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i i a : ee : gg Peter Thompson, General Manager Expl
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Slide 6: Our Current Interests...
Our Current Interests... Land portfolio 5,000sq km Three mills capacity /.7Mt pa 1 Endowment 23.2M ounces of gold ploration only 30% effective on Southern Cross & Leonora holdings Marvel Loch
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Slide 9: Sons of Gwalia Gold Mine
Sons of Gwalia Gold Mine _ 1896 - Welsh syndicate establishes mine { | 1897 - Herbert Clark Hoover convinced Bewick Moreing to develop the mine | 1898 - Sons of Gwalia Lid floated with Hoover as Mine superintendent | 4™ March 1929 of America
Slide 10: Sons of Gwalia Gold Mine in 1902
Sons of Gwalia Gold Mine in 1902 De . ia oe as x a NG ae Bs 5 ee ee L Le ae ; Lo _ a oe Le Le Ce oe _ 7 D y oi oo
Slide 11: Sons of Gwalia Incline Headframe
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Slide 12: Sons of Gwalia Gold Mine
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Slide 16: Gwalia Deeps Geology
Gwalia Deeps Geology
Slide 17: Gwalia Deeps Reserves & Resources
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Slide 20: Gwalia Deeps - Schematic Lode Plan
Gwalia Deeps - Schematic Lode Plan Main Lode Southwest Branch Stratigraphy Basalts / Dolerites South Gwalia Series|
Slide 21: Gwalia Deeps, old incline shaft
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Slide 23: Gwalia Deeps Resources
Gwalia Deeps Resources MAIN LODE RMIBRANCH RS) |) MMS GALASERIES? © GU esiicre
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Slide 28: Top Down Mining Method
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Slide 29: Sequence
Sequence
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Slide 31: Surface Raisebore Rig
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Slide 33: VR3A Ventilation Fan
VR3A Ventilation Fan
Slide 34: Refrigeration
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Slide 36: Stress Testwork
Stress Testwork | Q 2 = = 1000 i a (a) Principal Stress (MPa) 400 450 200 Hin Vigan + Extrepolated Max Yilgam Trend ane + Extrapoloated Min Vilgeen Trend — Updated @velia Trend Wes Viger
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Slide 43: Leonora Gold Deposits
Leonora Gold Deposits ee — Nae oy) LL a a a isis ZL a es 1. 7 y a ie a ce Co se Q oy Le es 1 Evaluating open pit resources at Kallis, McGraths and Tower Hill _ Kallis resources 3.6Mt @1.98/t for 220,000 oz
Slide 44: Tower Hill Cross Section
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