 More than 100 miners died in mining accidents in and around Carbanado, including 31 killed in an explosion in Carbon Hill Coal Company's Mine Number 7 on December 9, 1899.During the time of the initial boom in the valley Carbonado grew to rival the size of Tacoma at the time.The railroad, which was integral to the transportation of people, of the raw materials harvested and the supplies need by the towns, stretched all the way up the valley too.