http://www.cleanenergy.org/2016/02/23/amid-coal-market-struggles-less-fuel-worth-mining-in-us/

SACE | Southern Alliance for Clean Energy

Amid coal market struggles, less fuel worth mining in US

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“…an exhaustive government analysis says that at current prices and mining rates the country’s largest coal reserves, located along the Montana-Wyoming border, will be tapped out in just a few decades.”

Originally published on February 23, 2016.

http://bigstory.ap.org/article/32bb29a1c2a8493fbd40b7c4bf8e479f/amid-coal-market-struggles-less-fuel-worth-mining-us