A mine is a building you can ask Willy Builder to make for 16,500 coins. You have to hire Diggerlings to work in it. When Diggerlings work in the mine they find items such as gold nuggets, seeds, and gems. If you give a Candary a gas mask it can work in the mines too and get resources as well. Using the Mine is the only way that you will be able to get a Dragonache egg, but other items are more likely to be found in the mine. In Viva Piñata: Trouble in Paradise it is also the only way to get a blue or green bone, as Costolot's Store sells only red bones, not green or blue bones. The different colored bones allow you to configure the appearance of the Choclodocus when you hatch it. There are many things you can get from the mine that make it worth while other than the dragonache egg. If you build one you might want to get a Profitamole to eat the mine workings (the big piles of soil) that sometimes come out. However, in Viva Piñata: Pocket Paradise the mine does not produce mine workings.