The development of Little Cottonwood Canyon and the town of Alta dates to the 19th Century. A U.S. Army soldier first prospected for silver there in 1869. Mining became a large local industry, and Little Cottonwood Canyon became one of the largest producers of silver ore in the Wasatch Mountains. Known as the Emma Mine (the origin of the name of the Big Emma ski run in Snowbird's Gad Valley), the soldier's find eventually produced more than $3.8 million in silver. At its peak, 8,000 people lived and worked in the narrow canyon, which held two smelters, 138 homes, hotels, boarding houses, stores and a railroad. The entire town was later destroyed by a series of avalanches.