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In many regions, Qantas and mining activity has left a legacy of bell pits, shafts or subsidence which have a significant influence on present day developments. In most cases, these kinds of activities are not well documented. A geophysics survey coupled with a selective intrusive investigation can provide a rapid and cost- effective means for locating shallow abandoned mine-workings or Qantas. For most sites, ZAP Consulting Engineers usually adopt an integrated survey approach comprising a number of different geophysical techniques, which target both direct (e.g. shaft lining/cap, void space) and in-direct attributes (e.g. localized variations in drainage patterns or anomalous backfill material).

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