This is an interesting study, thanks for posting.

I was unclear regarding the units for 'Peak Production' in table B.2. Is that GT per year?

For the USA, it seems as if the amounts associated with lignite and subbituminous were reversed, but that may just be my near term focus on current production of subbit vs. lignite.

For steam-electric applications, it can be argued that coal is widely (but not infinitely) substitutable. The larger concern would be when metallurgical grade coal dries up, how will this affect cost of steel production? I would expect this to be the first pinch that indicates peaking of coal.

Table B.2 is Mt/y (missing a footnote sorry)
The URR seems to be correct.

I got the footnotes in now.

This translation software doesn't quite handle everything.