Over $140,000 worth of equipment has been stolen from Dubbo Regional Council's Amaroo Drive Depot in Wellington between 10pm and 11pm on Monday 6 July.
A white Toyota sedan was seen entering the depot multiple times.
The last known location of the sedan and the mini excavator was along Burrendong Way travelling towards Stuart Town.
The stolen equipment includes a Bobcat E20 Mini Excavator on a DND Welding Plant Trailer, a Quik Corp 1200L Dust Suppression Trailer, and an Express Welding Sign Trailer.
Dubbo Regional Council Mayor Josh Black said the act was incredibly disappointing and selfish.
"It's upsetting to see an act like this occur in the region we call home.
"This equipment was paid for by the community to be used for projects within our community. To so brazenly and selfishly steal it is beyond belief.
"Council has already been in contact with the NSW Police and will be assisting them with their investigation," Clr Black said.
Any members of the public with information about the whereabouts of the stolen equipment are asked to call the police on 131 444.
