The Mine can be found on the Island. When you unlock it, you can find valuable raw materials that can be used to make other products, e.g. Copper Ingotand Gold Ingot. Which raw materials you find depends on the selected explosive.
Usage: Tap the mine if the bar has above 1% capacity. To set off the explosives in the mine, drag the explosive material that you want to use to the place holder slots or invite a neighbor for help by pressing the neighbor button next to the place holder slot, and then press press Boom.
Each explosive shows how much % of capacity it needs to be able to be used!
After setting off the explosions you will be able to collect the materials. At the bottom of the mine you will see a loading bar that indicates the state of the Mine.
If it is zero you will need to wait until it is recharged before you can explode it again. The different explosives have different effect on the mine: the heavier the explosive the longer it takes before the mine is recharged again.