Lexi,you really must check for yourself, as the saying goes ......

Lexi,
you really must check for yourself, as the saying goes ... dyor.
When one checks these companies noted,
you may find that none are producing yet!
HUN may be the closest to commencing income - this year I believe.
However, the market appears to be pricing in the fact that exporting Mono coal is anticipated to rise considerably, the cost to mine is low, etc, bades well for encouraging profitability I guess.
Then one might also compare our Aus co's, to the global peers, to find that values on our co's are far less again, to the global guys, again, some of which have no income yet, or low income but rising.

In summary,
be good for you to google - or whichever means available, and research; happy for you to share or confirm what you have discovered :)

Cheers :)