
Industrial activity along the Purgatoire River defines this portion of the Maxwell Grant in the early 1950s. The coal-mining economy is clearly visible through the extensive infrastructure of the Frederick Mine, which includes airshafts, pipe drains, and several inactive shafts spread across the canyon slopes. Near the settlement of Segundo, the presence of Coke Ovens along the Colorado and Wyoming railroad tracks illustrates the local transformation of coal for the steel industry.
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