US-Colorado-Central City-Idaho Springs

From Silver Hall of Fame

Silver veins were discovered in the Central City-Idaho Springs district a short time after gold was discovered there in 1859. However, mining the silver veins was delayed for the most part until smelters were built in the late 1860s. The veins of the district are zoned in a roughly concentric manner, with gold-bearing pyrite veins in the center, and silver-bearing galena veins more common in the outlying areas.