USGS summaries - which aren't bad but lack the depth and detail of other mineral resource, exploration, production summaries that you might want to pay for if you're interested in more; hotlinking to all relevant documents, filings, company reports, etc.
For example: https://www.spglobal.com/marketintelligence/en/campaigns/met...
In the free infomation about global energy domain, there's the IEA reports: https://www.iea.org/analysis?type=report
( IEA reckons global coal demand has peaked and will decline after this year ).