Gold mines are expensive to build, and so is the rest of the production chain for gold coins.
There are only 300 gold ore in my goldmines, but it costs 1400 of marble and hardwood, and 1500 tools. How can I ever make a profit from building a mine? Refilling the mine is also 75 gems, which take forever to gather.
I can't see how the goldmines make themselves a profit, but then again, I'm only at level 25, so I may just not have much use for gold coins yet?
Any advice that can change my point of view?