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 South African rand coins of the Republic were the following: The coins initially had the same size as the former South African coins. All except the and 1 cent coins were in silver. The previous South African farthing coin (¼d) and half-a-crown (s) were not continued in decimal currency. In addition, two bullion coins with denominations of 1 rand and 2 rand were issued, replacing the gold half-pound and pound coins introduced in 1952. Both the pound and the rand gold coins matched the specifications of the British half-sovereign and sovereign (minted, among others, at the Pretoria branch mint until 1932), including the