Gold mines

Gold mines mine 1 gold bar a day but can be upgraded with coins, the gold bars can be used like coins except they can't upgrade or speed up buildings, buy VIP, protect from wars or use the daily gift. The mines interface should be like the cranny or warehouse and not have 4 mine slots.
Gold bars also cannot be donated to alliances or sold.
I hope you put my idea in

-Meeyt

"gold bars" cannot be used for speed ups, upgrades, VIP, war refuse, or pushing luck in DG, donated to alliance, or exchanged for treasure... so that just means they can be used to warp?

They can also be donated to alliances and sold. That was my autocorrect sorry.