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 Coins of the Hawaiian dollar In 1847, the Kingdom of Hawaiʻi, under the reign of King Kamehaheha III, issued its first official coinage—a large one-cent copper penny—to alleviate the chronic shortage of small denomination coins circulating in the Hawaiian Islands. The next and last official coinage of the Hawaiian Islands was minted in 1883, by King Kalākaua I; however during the intervening period, the changing needs of the Hawaiian Islands were met by circulating private-issued tokens and the coins of the United States of America. The following is a list of known coins and tokens issued by the Kingdom of