After discovery of Borax deposits here in 1881, William Tell Coleman developed the works which opened the way for "large-scale" borax mining in Death Valley and other Mojave Desert locations in the Calico Mountains and at Searles Lake. The Harmony operation became famous through the use, from 1883 to 1889, of large Twenty-mule teams and double wagons which hauled borax the long overland route to the closest railroad in Mojave, California...During the summer months, when it was too hot to crystallize borax in Death Valley, a smaller borax mining operation shifted to his Amargosa Borax Plant in Amargosa, near the present community of Tecopa, California. The Harmony Works remained under Coleman's operation until 1888, when his business collapsed.