Kalgoorlie, also known as Kalgoorlie–Boulder, is a city in the Goldfields–Esperance region of Western Australia, located approximately 595 km east-northeast of Perth at the end of the Great Eastern Highway. With a population around 30,000, it is the largest settlement for hundreds of kilometres and Australia's largest outback city. The urban area encompasses both the city of Kalgoorlie and the historic townsite of Boulder, which eventually merged following their simultaneous development in the 1890s.
The city was founded following the discovery of gold in June 1893 by Irish prospector Paddy Hannan and his companions near Mount Charlotte. Thousands of prospectors arrived within weeks, transforming the area into a major mining centre. The city's architecture is notably dominated by Federation-era buildings from the 1890s gold rush period. Hannan Street, the central high street also known as the "Golden Mile," remains lined with these heritage structures and developed from the original rough track created by prospectors. The city played a significant role in Australian Federation, with Goldfields residents—primarily migrants from eastern Australia—voting decisively in favour of Western Australia joining the Commonwealth in the 1900 statewide referendum, despite initial tensions over the state's hesitation to join.
Today, Kalgoorlie's economy remains dominated by gold mining. The Super Pit, one of the world's largest open-cut gold mines on the city's outskirts, is kilometres wide and hundreds of metres deep, operating 24/7 and serving as the region's largest employer. The city retains features from its gold rush heritage, including bars, hotels, and legally regulated brothels. The Prospector, a long-distance passenger train from Perth, connects the city to the capital via a 650 km journey of approximately 7 hours.