The Town of New Castle is a home rule municipality in Garfield County, Colorado, United States. The population was 4,923 at the 2020 census. When New Castle was incorporated in 1888, its economy was largely based on mining coal that was needed by the silver-mining industry to fire silver smelters. On February 18, 1896, a methane explosion in the V…The Town of New Castle is a home rule municipality in Garfield County, Colorado, United States. The population was 4,923 at the 2020 census. When New Castle was incorporated in 1888, its economy was largely based on mining coal that was needed by the silver-mining industry to fire silver smelters. On February 18, 1896, a methane explosion in the Vulcan Mine killed 49 men and started a coal fire that was still burning as of 2020. The Vulcan reopened and suffered additional explosions on December 12, 1913 and November 4, 1918.
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