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The origin of the subsurface fire burning since 1910 in the South Cañon Number 1 Coal Mine west of Glenwood Springs, Colorado, is unknown. Surface manifestations of the fire include gas vents (some encrusted with minerals), burnt vegetation, subsidence features, ash, sulfur, and red-oxidized shale.

The minerals tschermigite, mascagnite, and gypsum formed in association with coal-fire gas exhaled from a gas vent on the western slope of South Canyon.

Tschermigite and gypsum are reaction products of the gas with feldspar grains in the Williams Fork Formation. Gas collected from a vent and from soil above a burn zone in...

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