In 2018, AAI conducted the first stress measurements at  the Pumpkin Hollow underground copper mine shortly after construction of the primary production shaft.  A total of seven successful 3D stress measurements were conducted from the 1900 Level using CSIRO HI Cell gauges.  The rock was especially hot and stiff, with a Young’s Modulus exceeding 168 GPa in some locations.  Drilling equipment was slung and lowered down the shaft before installation of the permanent shaft cage.  Results advanced mine design.

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