BILLINGS—A former manager at the Signal Peak Energy coal mine in Musselshell County was sentenced today to two years of probation and ordered to forfeit an RV and a Rolex watch for his role in a conspiracy to defraud the company of about $2.3 million, U.S. Attorney Kurt Alme said.

Zachary Madison Ruble, 40, of Billings, pleaded guilty in May to conspiracy to commit wire fraud.

Chief U.S. District Judge Dana Christensen presided. Judge Christensen also ordered the forfeiture of a 2016 Thor Vegas RV and a Rolex Oyster Perpetual watch.

In court records filed in the case, the prosecution said...