The tutorial was frustratingly sparse leaving me with no real idea how to play. I'm having trouble fingering out cost to benefit ratio. The mines cost 2,000,000 to create and then 15,000 to upgrade the first time, 20,000 the second time and increasing from there. If the mine only lasts about 24-48 hours at about 250c per hour, for a two day mine, after spending upwards of 2,035,000c, it will only make about 12,000. That math doesn't seem like it's possible to make any profit on these mines.