 The Irvinebank Company's battery, which superseded an earlier small battery erected at Coolgarra by a local man (possibly Dempsey), began crushing in 1901.It was built on the side of a steep sided valley and is believed to be the steepest battery site in North Queensland.Its design incorporated a series of benches and involved the construction of one of the largest and most extensive stone retaining walls connected with a North Queensland mining site.