Metallurgical assay and the U.S. Mint continue to produce precious metal bullion coins for collectors and investors. The precious metal purity and content of these coins is guaranteed by the respective mint or government, and, therefore, the assay of the raw materials and finished coins is an important quality control. In the UK, the Trial of the Pyx is a ceremonial procedure for ensuring that newly minted coins conform to required standards. Metallurgical assay A metallurgical assay is a compositional analysis of an ore, metal, or alloy. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.
Coins of the Republic of Ireland Occasional "fantasy" coins were minted in the next century but these were neither circulated nor legal tender. The Irish Free State decided soon after its foundation in the 1920s to design its own coins and banknotes. It was decided that the Irish currency would be pegged to the pound sterling. The Coinage Act, 1926 was passed as a legislative basis for the minting of coins for the state and these new coins commenced circulation on 12 December 1928. The decision was mainly for economic reasons because, in 1924, 98% of Irish exports went to Great Britain and Northern Ireland, while