Air Compressor

A rotary air compressor rests against the rough stone cutting at Hornsby Quarry, pipes splayed across the broken ground, a rusted ladder leaning against the cooling unit. Graffiti marks the casing. Vegetation has pushed through the gravel around its base, the kind of slow reclamation that takes years and then, suddenly, looks permanent. Hornsby Quarry sits in Old Mans Valley, off Quarry Road in Hornsby, within a Jurassic diatreme, a volcanic neck that punched through Sydney Basin sandstone somewhere between 146 and 200 million years ago. The dolerite it left behind, dense and resistant, was exactly what road builders needed. Quarrying began around 1905 under the Higgins family, whose connection to the valley stretched back to an 1824 land grant. Hornsby Shire Council purchased the operation in 1912 to secure a reliable supply of blue metal for its road network. Hornsby Blue Metal Limited took over in 1924, and by 1959 the site was operating under Farley and Lewers, later absorbed into CSR Construction Materials. At its working peak, the quarry extracted approximately 110,000 tonnes of crushed dolerite per year. Operations ceased in 2002. Ownership passed to Hornsby Shire Council in 2003 after the NSW Land and Environment Court determined compensation of $26,508,771.28. The crusher plant buildings remained on site, along with the machinery the last shift left behind. This photograph, made in 2015, records the compressor where it sat in the years between closure and the large-scale rehabilitation works that followed. By the time the NorthConnex tunnel project began filling the quarry void with excavated spoil in 2017, the site was already well into its slow transition. The compressor, the pipes, the gravel, the graffiti, the creeping vegetation: a record of what the quarry looked like in the quiet years between one use and the next.