Coin

Coin is a currency substitute for Gold in the computer game Age of Empires III.

Game Info
Coin can be gathered from Gold, Silver, Copper, or Tin mines, trade, buying from Market, treasures, or from their allies, and Whaling can also be used to generate coin.

The Dutch have a unique building called the Bank which can produce coin for free. Factories can be set to produce an infinate supply of Coin, as well as Food and Wood. It can only be built if you have a "Factory" card and are in the Industrial Age or later.

All nations can build a plantion and use villagers to gather coin. Description from game: Slow, infine source of coin.