The successful tenderer for the work has withdrawn. Animal welfare groups who believe the horses should be left in the park are claiming the tenderer has withdrawn over concerns about the media attention surrounding the case, and fears of a backlash if the animals are ultimately slaughtered.
However, authorities are refusing to comment on the reasons for the tender withdrawal.
Queensland authorities were following up with other tender negotiations.
A group called "The Defence of the Brumbies in the Clemant State Forest" is being formed by those who support leaving the horses in the forest.