An investigation of a subsidence event in the Collie Basin of Western Australia, nearly 50 years after mine closure, has determined that the likely mechanism of subsidence development was the collapse of weak sandstone in the mine roof. The implication of this recent subsidence event is significant to the local region; there is far more potential for mining subsidence above other abandoned underground mines with similar mining/geological environments than was previously expected. Minesites in other geo-graphical locations, that are susceptible to roof collapse over time, are also potentially susceptible to this mode of subsidence development—depending on the height of the collapse and the rock mass strength of the materials within the roof horizon.

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