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Don't recall the exact location. I worked for a coal and dock company in the 80s and early 90s and all the old customers asked for it.

They operated many older boilers at 110 percent capacity and needed a high quality coal to keep up with steam demand. East KY had dozens of seams to pick from, some blended, but all low FSI to accommodate the chains which were sensitive to free swell index (coke button.)

We replaced it with a pretty close 13,600 product off the Big Sandy.

Today, eastern coals are being pushed out of the lakes by Colorado coal, railed to Chicago and distributed from there by steamship.
I never thought I'd see that happen.