Using numerical deformation–fluid-flow simulations to understand and target gold mineralisation around basalt domes in the Stawell Zone, Central Victoria, Australia |
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Authors: | Peter Schaubs Tim Rawling Jon Dugdale Chris Wilson |
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Institution: | aCSIRO Exploration and Mining, Kensington, W.A. 6151, Australia;bPredictive Mineral Discovery Co-operative Research Centre (pmd CRC), Australia;cSchool of Earth Sciences, University of Melbourne, Parkville, Vic., 3010 Australia;dLeviathan Resources Limited, Stawell Gold Mine, Leviathan Road, Stawell, Vic., 3380, Australia |
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Abstract: | We present 3-D deformation–fluid-flow numerical models which place constraints on the importance of basalt dome shape and syn-mineralising shortening direction in localising structurally controlled gold mineralisation around basalt domes near Stawell, Victoria, Australia. Gold mineralisation in the Magdala ore-body at the Stawell Mine occurs predominantly within a thin altered unit named the Magdala Facies which blankets the basalt domes. In numerical models of the Magdala Dome models only the east–northeast–west–northwest and east–west shortened models record high fluid-flow rates in areas of known mineralisation which is consistent with the syn-mineralisation shortening directions. In models of the Kewell Dome (a prospect to the north), the position of areas of high fluid-flow rate when shortened in the east–northeast–west–northwest and east–west direction, combined with information from limited drilling indicated the potential for gold mineralisation at the south-west end of the dome. Diamond drill holes in this area yielded significant gold values. |
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Keywords: | Deformation Fluid-flow Gold mineralisation Numerical modelling |
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