The underground world magically refreshes each day, so you must race to mine as much of it and as deeply as you can before nightfall. Using some very exciting and hyper-realistic methods for doing so. Your world might deteriorate as you grow, however. Hire and promote employees into specialised roles in your organisation, each type having exciting and game-changing bonuses and equipment. Grow your organisation into several hundreds of miners willing to go out and bring back coal for the cause. Many maps and many different starting professions mean endless ways of playing through the game! Feed the factories. Grow the corporation. Don't be afraid of the consequences. Do you have what it takes to build the greatest coal mining operation of all time?