| Methane from idled Colorado coal mine will continue to power Aspen Skiing | ||
| December 5, 2013 | ||
| Colorado coal mine to be idled | ||
| December 3, 2013 | ||
| Oxbow Mining to abandon longwall equipment | ||
| October 4, 2013 | ||
| Coal production in Colorado drops in 2013 | ||
| August 28, 2013 | ||
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