Powder River Basin coal mine ceases operations, asks court to .
WEBFeb 5, 2021 · When Westmoreland Coal Company, the owner of the Kemmerer mine in southwest Wyoming, filed for bankruptcy, it received court approval to toss out retiree obligations and the union contract in 2018. What's more, a majority of the Powder River Basin coal mines are not unionized, leaving workers with few protections when a .