[[File:Coal Mine Default Model.PNG|400px500px]]

The Coal Mine is the main source of Coal [[File:icon coal.png|16px|link=material]], which can be sent for processing at a '''[[Toolworks]] ''' to become Coal Tokens [[File:token coal.png|16px|link=token]] or it can be combined with Iron Ore [[File:icon iron ore.png|16px|link=material]] at a '''[[Foundry]] ''' to create Iron [[File:icon iron.png|16px|link=material]] and Coal Tokens [[File:token coal.png|16px|link=token]]. In 4th era coal is being used as fuel to produce steel [[File:Icon_steel.png|16px|link=material]] in steelworks and from 5th era on it is needed as fuel in [[Coal_Power_Plant|'''Coal Power Plant ''']] to generate electricity. Thus coal mining becomes critical throughout the whole game.

The base version of the Coal Mine generates 1 Coal [[File:icon coal.png|16px|link=material]] per '''[[Game tick]]'''. The capacity of the mine can be extended using 5 extension buildings that can be built on adjacent tiles to the base Coal Mine building. Three of the extensions providing increase to the Coal [[File:icon coal.png|16px|link=material]] output of the mine could be build immediately, while . The ''Second Hearframe'' will be available in 2dn era and the "''Third Headframe" '' will become available in 5th era of the game. Of all extensions the "''Second and Third Headframes" '' provide the largest increase to Coal [[File:icon coal.png|16px|link=material]] production. The "''Timber Tunnel Supports" '' extension adds a new process that consumes Timber [[File:icon timber.png|16px|link=material]] while providing another large increase to Coal [[File:icon coal.png|16px|link=material]] production. When all extensions are built around a Coal Mine, it consumes 0.5 Timber [[File:icon timber.png|16px|link=material]] and produces 8 Coal [[File:icon coal.png|16px|link=material]] Per per '''[[Game tick]]'''.<br/>Some of the buildings can be connected to the electrical network [[File:E_energy.png|16px|link=Electrification]] from Era 5 onward, which will increase their production. The amount of electrification production bonus (if applicable) is shown in the brackets at each extension. The base process of the Coal Mine is:  {| class="wikitable transformable " style=text-align:center!Image!Name!Consumes!Produces![[Game_tick|Ticks]] to<br/>complete!Building<br/>dimension (tiles)|-| [[File:Coal_Mine.png|x120px]]| Coal mine| -| 1 [[File:icon coal.png|16px|link=Material]] + (1 [[File:icon coal.png|16px|link=Material]])[[File:E_energy.png|16px|link=Electrification]]| 1| Random shape <br/>(4 tiles total)|} 

 {| class="wikitabletransformable "style=text-align:center! Image in game! ExtensionName! InformationCost! Consumes! Produces! No. of [[Game_tick|Ticks ]] to Complete<br/>complete! Building Tile Sizedimension<br/>(tiles)!Unlocked<br/>at epoch

| [[File:Coal_Mine_StorageCoal_storage.png|200pxx120px]]| Coal storage| 120 [[File:Coal Mine Extensions Coal Storagetoken money.PNGpng|16px|link=Token]]| The Coal Storage| None-| 1 Coal [[File:icon coal.png|16px|link=Material]]| 2 Ticks| 2x11x2| -

| [[File:Coal_Mine_MaintenanceMaintenance_shed.png|200pxx120px]]| Maintenance shed| 40 [[File:Coal Mine Extensions Maintenance Shedtoken money.PNGpng|16px|link=Token]]<br/>80 [[File:token coal.png|16px| The Maintenance Shedlink=Token]]| None-| 1 Coal [[File:icon coal.png|16px|link=Material]]| 1 Tick

| [[File:Coal_Mine_TimberTimber_Tunnel_Supports.png|200pxx120px]]| Timber tunnel supports| 200 [[File:Coal Mine Extensions Timber Tunnel Supportstoken money.PNGpng|16px|link=Token]]<br/>20 [[File:token timber.png|16px| The Timber Tunnel Supportslink=Token]]| 1 Timber [[File:icon timber.png|16px|link=Material]]| 3 Coal [[File:icon coal.png|16px|link=Material]]| 2 Ticks

| [[File:Coal_Mine_2ndSecond_Headframe.png|200pxx120px]]| Second headframe| 50 [[File:Coal Mine Extensions Second Headframetoken iron.PNGpng|16px|link=Token]]| The Second Headframe-| None2 [[File:icon coal.png|16px| 2 Coal link=Material]] + (1 [[File:icon coal.png|16px|link=Material]])[[File:E_energy.png|16px|link=Electrification]]| 1 Tick

| [[File:Coal_Mine_3rdSecond_Headframe.png|200pxx120px]]| Third headframe| 10 [[File:Coal Mine Extensions Third Headframetoken electricity.PNGpng|16px|link=Token]]<br/>20 [[File:token steel.png|16px| The Third Headframe (available in 5th Era)link=Token]]| None-| 2 Coal [[File:icon coal.png|16px|link=Material]] + (1 [[File:icon coal.png|16px|link=Material]])[[File:E_energy.png|16px|link=Electrification]]| 1 Tick