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 Hawaiian dollar for 100,000 of these coins in 1846. He contracted Edward Hulseman—best known for his 1837 Half Cent token—to design and engrave the coin. It is not known precisely where the pieces were minted – although Walter Breen in "Complete Encyclopedia of U.S. and Colonial Coins" asserts that they were produced at the private mint of H. M. & E. I. Richards of Attleboro, Massachusetts; regardless, Jarves was given a note dated January 14, 1847 in the amount of $869.56 by the Minister of Finance as payment for the order. On 3 May 1847 the merchant ship Montreal arrived in Honolulu