ABSTRACT:
The in situ stress field has been measured, using two separate stress tensor measurement techniques, at six mine sites located in the Kundana mining region along a 10km strike of the Zuleika Shear Zone. The Zuleika Shear Zone is an extensive regional shear in the Archean Yilgarn Craton of Western Australia. The stresses measured by the two techniques are compared and then considered in the context of a larger database of stress measurement results taken from within the Yilgarn Craton. The results allow comparison between stresses accommodated by the craton en masse and by its extensive crustal scale faults and shears.
1 INTRODUCTION
Two separate three dimensional stress tensor measurement techniques have been used to measure the in situ stress at six mine sites located in the Kundana mining region of Western Australia (WA); namely: • The CSIRO Hollow Inclusion Cell (CSIRO HI), described by Worotnicki & Walton (1976), in conjunction with the overcoring technique. • The WASM Acoustic Emission technique (WASM AE), the first form of which was described by Villaescusa et al. (2002). Nine stress measurements have been conducted at Barkers Mine and Strzelecki Mine using the CSIRO HI Cell in conjunction with the overcoring technique. These measurements have been taken from available mine drives. Twelve stress measurements have been conducted for six mine sites including Barkers Mine (M1), Strzelecki Mine (M2), Raleigh Mine (M3), Rubicon Mine (M4) and Hornet Mine (M5) using the WASM AE technique. These measurements are taken from oriented core sampled from deep surface boreholes. 2 STRUCTURAL GEOLOGY 2.1 Continental and regional scale structure The Kundana mining province is located along the Zuleika Shear Zone (ZSZ) which lies within the Norseman-Wiluna Belt, in the Kalgoorlie Terrane of granites and greenstones of the Archean, Yilgarn Craton of Western Australia (WA) (Fig. 1)..
