These colors may knock a Red coin down to Red Brown or Brown, but they can enhance a coin’s eye appeal, grade and value. In addition, sometimes toned copper coins can take on attractive purple, blue, green and turquoise coloration. Even after a copper piece has turned brown, it can still retain strong luster. A Brown copper coin can still have traces of mint red, but only very small amounts. If virtually all of the original mint red has vanished, the designation “BN” or “Brown” is used. The RB designation covers a wide range of colors, ranging from “near-miss” coins that are mostly red to coins that are predominantly brown with minor amounts of red left. Coins that still retain some (but not all) of the original mint red, the designation “RB” or “Red-Brown” is applied. In order to qualify for the RD label, virtually all of the orange-red color must be intact save for some extremely minor spots or flecks.Īs copper coins begin to oxidize and tone, their color generally turns to a brownish hue. Copper piece retaining full original mint color are designated as “RD” or “Red.” This designation is listed immediately after the coin’s grade, i.e. With that in mind, numismatists have devised specific designations to describe a copper coin’s color.Ĭopper coins, when newly struck, display a bright, vibrant orange-red color. While silver, gold and (to a lesser degree) nickel are reactive to some degree, copper is the most likely to oxidize, tone and change in color. Tom Maringer, engraving by Gary Carlisle and Stan Pearson.Of all the metals used for United States coins, copper is perhaps the most chemically volatile. 925 sterling silver, measures 3.5 cm in diameter, and weighs about 37 grams. This Copper Country Bi-Metal Bullion is struck from solid copper and. This is a fine piece of mining-related exonumia, a great addition to any collection of Upper Peninsula minerals or artifacts, and a historically significant bullion piece. Even though it was a joke, it has now, years later, become commonplace for copper bars and rounds to be designated in troy ounces. The use of the troy ounce in denominating the weight of copper was intended as an offhand joke, as troy ounces are generally used only in reference to precious metals. This coin was first made in 2006 and is historically significant in the bullion trade as it was the first ever use of troy ounces as the weight designation of copper bullion. Each bi-metal coin has special "railroad rims" that have been knurled onto the coins one at a time. The reverse side depicts the still-standing Quincy #2 shaft-house, a National Historic Site, viewed from the south. On the coin obverse is a high relief image of a miner with pick, oil lamp, and pipe. The Upper Peninsula of Michigan is one of the only places this ore is found. This bullion coin represents halfbreed ore, in which a sample of pure silver and pure copper are found in the same rock. Michigan's Copper Country is unique in that most of the copper found is the pure copper metal, rather than copper oxides or sulfides found in most other copper mining districts. This special edition coin has been fitted with a center plug of 1.7 grams of sterling silver, containing 1/20 of a troy ounce of fine silver. The original coin was minted from a massive blank weighing 36 grams of pure. This special copper and silver bullion coin honors the famous Quincy Mine in Hancock, Michigan, located on the scenic Keweenaw Peninsula.
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