Postcard showing a view of Central City, Gilpin County, Colorado, with mines on the hills in the background. The photograph on the postcard was probably taken sometime between the late 1940s and the early 1950s. Central City came to be known as "the richest square mile on earth." In 1859 John Gregory discovered the Gregory lode in this area. Within months there were between 20,000 and 30,000 people in the area. During that first summer an estimated $1,500,000 to $2,000,000 in gold were recovered from easily worked surface deposits. As the digging got tougher, the population declined to a more stable level. Although more than one camp was established in the area, Central City grew faster and in 1861 became the Gilpin County seat.
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