The Big Mine, released with the Jeweler’s Update on 12/10/2015 gives us a few more crafts and allows us to be able to mine more Silver Ore, Coal, Granite and Iron Ore besides just getting them from the regular Mine. It costs 5000 coins.
Big Mine Building Stages
Recipes in the Big Mine
Golden Frontier Cave Rock Recipe
Golden Frontier Amber Recipe
Golden Frontier Quartz Recipe
These Recipes can also be crafted in the Regular Mine on Cloudy Lands: