
The industrial coal-mining landscape of southern Colorado is documented in detail on this 1959 survey, particularly around Rockvale and Coalcreek. The northeastern quadrant is densely marked with the legacies of extraction, showing numerous Mine Dumps, the Coal Creek No 2 Mine, and the Filtration Plant essential for local infrastructure. A distinct Old Railroad Grade and the active A T & S F RR line indicate how heavy minerals were moved from sites like the Caldarola No 1 Mine and Twin Pines Mine to the broader market.
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