In September 1891 the staking of two mining claims in the mountains west of the site with the promise of silver, lead and zinc sparked a keen interest in the area bringing prospectors, outfitters, businessmen and a mining boom was born in the Slocan mining district.
The town grew rapidly and soon the businessmen had enough faith in its future to apply for a charter to establish the first city in the Kootenay region. This was granted on 14th August 1893 and Kaslo elected Robert F. Green as its first mayor. The first years of the City of Kaslo were challenging. Silver prices plummeted following the repeal of the Silver Purchase Act in the U.S. in 1893 and the population started to diminish.