exploring the cave, but it will alternate with the gathering of coal and it takes time to regenerate. Using a Master Gatherer is also essential, and it only appears after you've reached Chapter 2!

If all of the above conditions are met and you still can't gather charcoal, please contact us through Customer Support by tapping/clicking on the 'gear' icon in the upper right corner of your screen and then 'Help' (if you're playing the free-to-play version of the game) -
we'll be more than happy to review your game!