A unit of energy and commodities trader Noble Group Ltd won the bankruptcy auction to buy assets of SemGroup Ltd's SemFuel unit for $65.5 million, according to court documents.

A hearing will be held on August 13 in the U.S. Bankruptcy Court for the District of Delaware to approve the sale to Noble Group's Noble Americas Corp, according to the documents dated August 4.

SemGroup was the the 14th largest privately held U.S. company when it collapsed into Chapter 11 protection in July 2008 after recording $3.2 billion in trading losses.

The company has said it hopes to emerge from bankruptcy proceedings by the end of September. (Reporting by Matt Daily; editing by Carol Bishopric)