The Economic Times

By 1910, Tercio, Colorado's coal mines employed around 1,000 men and supported 300 families; the mine closed in 1915, and its coke works followed in 1918

Tercio, Colorado, was once a thriving coal mining company town built around the Colorado Fuel and Iron Company. Home to hundreds of mining families, the isolated community depended on the company for jobs, housing, groceries and essential services. However, mine closures between 1915 and 1918 led to its decline. Tercios forgotten history reveals the harsh realities of early American coal mining, workers struggles and the risks of company-owned towns.