A report in Bloomberg said the first round of bids for the mines is tipped to begin in May.
A handover of its thermal coal operations could generate $600 million, according to a source with knowledge on the matter.
The mines are expected to be sold separately, with private equity investors and US and foreign coal producers already reportedly showing interest in Arch’s thermal coal operations.
The news service named financial advisors Deutsche Bank AG as the company that is handling the sale process.
Arch is the fourth-largest US coal producer and sold 155 million tons of the resource in 2011.
At present, the company holds more than 20 active mining complexes in every major US coal supply basin.
