From the Australian Acacia key it will either be A.alleniana or A.jasperensis but we cannot seperate which botanically without seeing the pods or making a dubious call on the shape of the phyllodes (Terete vs subterete). Distribution suggests that the former is much more common in the in the North and North-east of the Territory whereas the latter seems confined to the North-west.
- All that to say I think you are right and will confirm as such. But there is a degree of uncertainty