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High definition gravity surveys and density modelling for kimberlite exploration

, : High definition gravity surveys and density modelling for kimberlite exploration. Exploration Geophysics (Melbourne) 32(2): 89-94

Gravity data obtained at Hiles Lagoon, near Terowie, indicates the presence of a subtle gravity low. The 5 mu m s (super -2) gravity low over the lagoon possesses roughly circular dimensions with a diameter of approximately 200 m and is the likely response of a concealed kimberlite pipe. These results are of particular interest since previous aeromagnetic and aeroradiometric geophysical surveys have had little success in detecting a kimberlite pipe at Hiles Lagoon. Density determinations typical of weathered Australian kimberlites and shales were employed to create a structural model of a kimberlite pipe and the surrounding country rock. Resulting gravity raster images from the kimberlitic model allow us to confidently interpret the field response as a kimberlite pipe and justify the application of the gravimetric technique as a tool for detailed exploration.


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