In an update released on March 17 2019, the mint was removed and replaced with the Tool Exchange. All players were refunded 15,000 coins following its removal.
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You were able buy the Mint when your population is 1650 for 15,000 coins.
Here you could mint coins by using ingots. You could 'sell' ingots for more than you would get from the barn.
The Mint isn't so useful unless you've upgraded all factories, trains, ships and collected all the artifacts.
|Product||Materials||Selling Ingots||Sold at Mint||Time|
|Handful of Coins||3 Bronze Ingots||3 x 96 coins|
|Stack of Coins||4 Bronze Ingots|
1 Silver Ingot
|4 x 96 coins|
1 x 144 coins
|Sack of Coins||5 Bronze Ingots|
1 Gold Ingot
|5 x 96 coins|
1 x 204 coins
|Box of Coins||6 Bronze Ingots|
1 Platinum Ingot
|6 x 96 coins|
1 x 300 coins