Hello Dankita,
This is most likely a result of yesterday's sub-quest "Professionals for Every Job" from the "A Host of Responsibilities" quest chain. As we've stated in an update to the
latest changelog, as a result of completing this quest, the population on your island was being displayed as "0", even if it was indeed negative. Since your population was negative, you did not have enough Settlers to man the mine thus it did not start production. I suggest that you use an "Add Resource: Settlers (population)" to fill up the calculated negative count of your population and all will be back to normal. We are working on a fix for the quest.
Regards,
BB_Sious