Why did Ballarat and Bendigo originally grow quickly?

Ballarat and Bendigo experienced rapid growth in the 1850s primarily due to the discovery of exceptionally rich gold deposits in those areas. Following the initial Victorian gold discoveries in 1851, these two sites became the most important and productive goldfields in the colony.123

The promise of wealth triggered a massive influx of immigrants, with more than 200,000 people arriving from Britain and 25,000 from China to work the fields. This sudden surge of miners and capital transformed Victoria from a pastoral backwater into a prosperous, rapidly developing society. The wealth generated by these fields supported the establishment of new businesses, infrastructure, and towns, fueling the dramatic population growth that saw Victoria’s total population exceed 500,000 by 1860.234