I am looking for historical data on coal prices.
Hello Ricardo, this is a table of coal prices 1947-2008:
https://www.eia.gov/totalenergy/data/annual/showtext.php?t=ptb0709
...and some more recent data: https://tradingeconomics.com/commodity/coal
IMF monthly coal (Australia) prices start in 1990. Their data are curated. If you are interested in recent data, you could also look at futures markets which would provide you with high frequency data of, likely, a few years.
Have you tried the many data repositories that exist?
See https://www.re3data.org/ for a searchable list
Find a repository (or repositories) per country and then search there for coal prices.
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