Why is gold silver copper used to make coins but not magnesium?

Answer 1

Silver became too expensive to make coins from, for many countries, during the 20th Century. Low denomination coins are traditionally made from copper, but copper has also become too expensive and many of the coins that were made from copper have either been dropped from their respective currencies as useless due to inflation or, have been made from a cheaper metal such as steel or aluminium.

Answer 2

Pure copper, silver and gold has not been used to make general circulation coins for a long time, but for many years, the value of a coin was determined by the metal it was made from and its weight.

British copper coins changed to bronze, which included a large percentage of copper, in 1860. British silver coins were gradually debased from 1919/1920 and changed to a copper nickel alloy from 1947.

Copper was a relatively cheap and durable metal to make coins from once, but became much too expensive, even as part of a bronze alloy. In the early 1990's, all British bronze coins were subsequently made from copper plated steel.

Silver was used to make coins of a higher value and the value of the coin was reflected in the diameter and weight of the coin, but silver also became too expensive.

Answer 3

Way back in the old days, the value of a coin was determined by the metal it was made from and the amount of that metal that was used to make the coin.

In more recent times, the value of a coin is a token value only and the coins are made as cheaply as possible which is why you do not see any gold or silver in circulating coins.

Coins continue to be made from various metals and combinations of metals (alloys) because they make a durable and long lasting coin. The Royal Mint expects to get up to 40 to 50 years use from a coin.

Answer 4

Pure copper, silver and gold have not been used to make general circulation coins for a long time, but for many years, the value of a coin was determined by the metal it was made from and its weight. Even as an alloy, gold and silver are no longer used due to the cost, and copper is used decreasingly due to the expense.

Magnesium, although it is a common naturally occurring metal, is unsuitable for making coins because it oxidises easily and burns intensely once it is hot enough.