Comparative values for metal coins in fantasy story?
I'm writing a fantasy story, but I need some help with the currency.
The coins used in human realms (as opposed to lands ruled by Elves, Dwarves, Gnomes, Trolls, etc.) are to be made out of five basic metals: copper, nickel, silver, gold and platinum. Each metal class comes in two sizes, a Minor, about 1 inch across and 1/16 of an inch thick, and a Major which contains five times the amount of metal as the Minor by weight.
Dwarves make coins out of purer forms of each of those metals than humans know how to make, and all the coins are 1 1/2 inches across and 3/16 of an inch thick.
What I'm looking for are basic money-changers' rates for exchanging One Coin for another.
Let's take this as, say Roman times, as opposed to modern ones. The silver to gold ratio was 4:1, for most of recorded history (changes as Europe send silver to India for goods, and as Spain brought in gold from the New World).
Can't help with real world examples on the other two.
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