Wikipedia:Articles for deletion/List of countries by coal reserves
Looking at policy, this article doesn't really violate any of  and is otherwise an acceptable topic for a list. As far as importance and notability, there's actually quite a lot written about coal reserves that demonstrate it's something sources note and view as 'important' and 'relevant'. See, for example, https://www.theguardian.com/commentisfree/2020/may/20/marsh-can-no-longer-sit-on-the-fence-it-must-rule-out-brokering-insurance-for-adani ''The Guardian'' op-ed {{Cite journal|last=Dai|first=Shifeng|last2=Ren|first2=Deyi|date=2006-05-01|title=Fluorine concentration of coals in China—An estimation considering coal reserves|url=http://www.sciencedirect.com/science/article/pii/S001623610500387X|journal=Fuel|language=en|volume=85|issue=7|pages=929–935|doi=10.1016/j.fuel.2005.10.001|issn=0016-2361}}, {{Cite journal|last=Anastasiu|first=N.|last2=Simionescu|first2=B. C.|last3=Popa|first3=M. E.|last4=Mihai|first4=M.|last5=Rusu|first5=R. D.|last6=Predeanu|first6=G.|date=2018-10-01|title=Romanian coal reserves and strategic trends|url=http://www.sciencedirect.com/science/article/pii/S0166516218303252|journal=International Journal of Coal Geology|language=en|volume=198|pages=177–182|doi=10.1016/j.coal.2018.09.011|issn=0166-5162}}{{Cite journal|last=Heinberg|first=Richard|last2=Fridley|first2=David|date=November 2010|title=The end of cheap coal|url=https://www.nature.com/articles/468367a|journal=Nature|language=en|volume=468|issue=7322|pages=367–369|doi=10.1038/468367a|issn=1476-4687|quote=New forecasts suggest that coal reserves will run out faster than many believe. Energy policies relying on cheap coal have no future, say Richard Heinberg and David Fridley
— NONE, NONE
Stance: keep
Cited policy: WP:NOT (Wikipedia:What Wikipedia is not)