Mines not producing

[Rx22]

I have 2 deep and 2 sparkling for two days they are providing only stone, coin and occasionally ore. No coal so I am buying rocks and spending additional energy to harvest coal. Any one else experiencing this issue?

Thanks

[ShibuyaCloth]

Did not really focus because I don't use mines for coal. my preferred source are Flyger Cubs as they yield much more. But of course not every one have those. I get silver and Elvenite.

[[S8] HungryGoblin]

Coal can be somewhat rare and may take multiple attempts from Deep and Sparkling Mines. Please check out the Inventory Guide here for additional options for collecting Coal. Hope that helps.