Hand me the back of the envelope, please, edition 2

In which we learn that the social cost of the carbon in the coal to be removed from the North Porcupine Coal Tract of Wyoming is about 90 times what the mining company will pay the government for the coal. This at a SCC of $65 / ton CO2. Oh, perhaps you prefer the more conservative $12 median estimate from the economics literature? OK, then only 17 times...