I found good sources describing the present day cost of excavating surface mine coal, and shipping it. This one is excellent:
The reclamation costs after the coal is gone are enormous and not included in the cost of extraction.. Most companies shut their operations down and bankrupt the mining company to avoid doing it.
"Five companies that are collectively responsible for more than 40 percent of the nation’s coal mining capacity are now in bankruptcy court. But what’s happened with Peabody, specifically, may change the way states look at how they get and keep money for reclamation. Peabody’s cleanup bill in the Illinois Basin alone would come to $92 million, but it also operates mines in Australia, Arizona, Colorado, New Mexico, and Wyoming, where the North Antelope Rochelle mine—the largest in the country—stretches across 100 square miles.