Current U.S. quarters are made from copper and nickel as are dimes and nickels. Pennies are made from copper-plated zinc.
All modern coins in circulation are made of metal.
There's more copper in coins of today than in olden days.
Modern coins are made in factories called mints.
Modern coins are not so corrodable in water.
Modern coins cannot rust, as they are not made of iron.
because leather was not worth as much
Cents are made out of copper-coated zinc (post-1982), modern dollar coins are made out of brass.
Modern English 1p coins are made of copper-plated steel. So yes, there is a tiny amount of copper.
In ancient times, coins were made from brass, copper, silver, and gold. The use of nickel was not introduced until modern times.
U.S. coins used to be made with silver, typically a blend of 90% silver with 10% copper. Then modern dimes, quarters, and half dollars are nickel-coated copper. Nickels are made with 25% nickel and 75% copper. There aren't any coins made of a silver/nickel blend.
Silver dollar coins (1794-1935) were never made of pure silver. It's too soft and the coins would wear out very quickly. They (and most other silver US coins) were made of an alloy of 90% silver and 10% copper. Circulating US dollar coins were made of copper-nickel from 1971 to 1999. The composition was changed to gold-toned brass in 2000. Modern "eagle" coins with an artificial $1 denomination are made of 99.9% pure silver, but these coins aren't intended for spending.
All coins returned to the Mint for any reason, and any coins that are minted surplus to requirements, are melted down and the metals reused. This has been a very long standing practice, especially in the days of gold and silver coins.