Board Thread:General Discussion/@comment-181.72.81.16-20131216222553/@comment-206.131.30.40-20140917205604

Bloonstone mines are a good idea, city level requirement 40, produces 3 bloonstones/hour, max capacity 3, max number 5, only on caves, and cost full bank amount (whatever that is) and in addition, takes 168 hours to build.