Portland Cement Works in central western NSW began as a limestone quarry in 1863 and produced lime then cement on and off from the late 1880s. The Commonwealth Portland Cement Company, formed in December 1900, completed the main works in 1902 and built the distinctive arched-window powerhouse between 1900 and 1903 - its iron girders shipped from the same English manufacturer that supplied the Eveleigh Railway Yards. The works lit Portland's streets from 1910. The Off White cement that came out of the works in the 1960s became the basis of the Portland Cement brand still used in Australia. Production ran on a dry process until 1928, then a wet process from the 1940s, then under Blue Circle Southern Cement after the 1974 BHP merger. Cement ceased in 1991; quarrying ended in 1998. Listed on the NSW State Heritage Register on 3 August 2012. The site is now owned by AWJ Civil; Guido van Helten's silo murals, painted in April and May 2018, depict six former Portland Cement workers.