Why did the Australian gold rush start?

The Australian gold rush started in 1851, when gold was discovered in New South Wales. The discovery of gold led to a mass migration of people to Australia, as people from all over the world flocked to the country in search of fortune. The gold rush had a profound impact on Australia, both economically and socially. It led to the development of new towns and cities, and the growth of the economy. It also led to increased immigration, as people from all over the world came to Australia in search of gold.