The conglomerate and sandstone mountain range is known to local
Djungan people as
Ngarrabullgan. The Djungan people began living on the mountain about 40,000 years ago but ceased to camp on the range about 600 years ago. The range was named Mount Mulligan after prospector
James Venture Mulligan by his colleagues in their 1874 exploration expedition searching the Hodgkinson River for gold. The name Mount Mulligan was later given to the town that grew in the shadows of the range's escarpment. Mount Mulligan Post Office opened by July 1914 (a
receiving office had been open from 1907) and closed in 1959. A Mount Mulligan Rail Post Office was open between 1916 and 1920. The
Chillagoe railway connected Mount Mulligan with
Dimbulah. It opened on 7 April 1915 and was officially closed in January 1958. == Demographics ==