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 pound François Burgers in 1874 and from 1892 to 1902 coins denominated as 1, 3 (or a tickey), and 6 pence; 1, 2, 2½, and 5 shillings; and ½ and 1 "pond" were issued bearing the likeness of President Paul Kruger. The last of these coins were issued in 1900. In 1902, after Pretoria was occupied by the British, 530 "veldpond" gold coins were minted in Pelgrimsrus. Until the war ended these were produced under exceptionally difficult conditions by use of a handmade press. These coins were minted under the Presidency of Paul Kruger and bear his bust on the reverse