1. Coal, there is coal on bare land in the Firelands! Underground mines also have! Potassium nitrate Ground is rare now! With the mine, forest lakeside fault, prairie mountain fault, there is coal does not necessarily have to dig a hole in the ground, the brick durability to 25, digging to the stone and then continue to dig down, digging five or six compartments can be dug to a lot of coal!
2, saltpeter, in the forest surface has carbon on the side of digging some soil off to expose the rock, if the surface has a mine no matter what mine dig down there must be saltpeter.