Mines
Efficient Mine 
How to build it
The efficient mine is Iron Teeth exclusive, and needs to be built on an underground ruin. To build the efficient mine you will need 300 logs, 300 treated planks, and 450 gears; logs are harvested by the lumberjack, treated planks are made in the wood workshop, and gears are made in the gear workshop.
What it does
The efficient mine produces 3 Scrap Metal per 1
gear, 1
Treated Plank per hours per
beaver - the UI will change to show the production time the more beavers you have employed.
Scrap Metal can be turned into
Metal Blocks using the
Smelter.
Mine 
How to build it
The mine is Folktails exclusive, and needs to be built on
Underground Ruins. To build the mine you need 250
Logs, 200
Treated Planks, 350
gears; logs are harvested by the
lumberjack, treated planks are made in the
Wood Workshop, and gears are made in the
Gear Workshop.
What it does
The mine produces 2 Scrap Metal per 1
Gear, 1
Treated Plank per 18 hours per
beaver - the UI will change to show the production time the more beavers you have employed. Scrap metal can be turned into
Metal Blocks using the
Smelter.