& Humphreys 2006). 2006). Aboriginal Tension Subsidence Longwall extraction took near the site Not known In February Cave roof rock art site, cracking. related to in 1980. 1984, 26 post supports remain Metropolitan longwall supports were in Water Some roof collapse was observed in Special extraction. installed to seepage due September 1981. Areas support the roof to increased Further roof collapse was recorded in which was in permeability. January 1982. danger of total Roof In February 1984, 26 post supports were collapse. collapse. installed to support the roof which was in danger of total collapse.
& Humphreys 2006). 2006). Aboriginal rock art site, Metropolitan Special Areas Tension cracking. Water seepage due to increased permeability. Roof collapse. Subsidence related to longwall extraction. Longwall extraction took near the site in 1980. Some roof collapse was observed in September 1981. Further roof collapse was recorded in January 1982. In February 1984, 26 post supports were installed to support the roof which was in danger of total collapse. Not known In February 1984, 26 post supports were installed to support the roof which was in danger of total collapse. Cave roof supports remain in