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The auction of mines owned by bankrupt coal operator Blackjewel continued well into the evening Thursday, with no results announced before press time. The sale comes exactly one month after Blackjewel shuttered its two Wyoming mines, sending hundreds of workers home and roiling communities in the Powder River Basin.

Blackjewel attorneys filed notice of the auction Wednesday, a sign that other companies likely submitted additional bids on some or all of Blackjewel’s assets. Any offers selected at the auction will need a federal bankruptcy judge’s approval at a sales hearing scheduled for Aug. 5.

A spokesman for Blackjewel declined to comment on the auction.

The former owner of the company’s Wyoming mines, Contura Energy, offered to purchase three of Blackjewel’s mines for $20.6 million last week, agreeing to immediately dish out $8.1 million for continued maintenance of the mines during legal proceedings.

According to the court documents, Contura would make an additional cash payment of $12.5 million to Blackjewel and retain responsibility of the nearly $250 million in reclamation, or cleanup, liabilities for its Belle Ayr and Eagle Butte mines in Wyoming.

The coal company would also assume ownership of Pax Surface Mine in West Virginia under the proposed deal.