The prominent midribs and curved tips on the phyllodes ('leaves') make it quite likely. However, a search on Wattle2 found 16 species of Acacia on the Southern Tablelands of NSW (there is no separate search field for ACT) with phyllodes in the length and width range of Acacia doratoxylon. The main photo is useless for identification and the other closeup is not in good enough focus to show the details needed. When plants have neither flowers nor pods, field notes with measurements of leaf length and width and plant height, and photos showing details are needed. I have spent nearly an hour on this.
http://www.cpbr.gov.au/cpbr/ACT-census-2012/vascular-2012.html Narrows down the list of possibilities, and it is known along the Murrumbidgee within the ACT
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