1) The 1849 California Gold Rush and subsequent gold and silver discoveries in Colorado and Nevada in the late 1850s led to mass migrations to the American West and new mining settlements.
2) In 1897, large gold strikes in Canada's Yukon Territory and Alaska sparked the Klondike Gold Rush, drawing over 100,000 prospectors to the region within a year and establishing new frontier towns.
3) As mining camps grew into towns, women and children joined the miners, transforming rough camps into proper communities. Some camps like Seattle developed into large, wealthy towns built on the mining industry.