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Home Categories Metals Trading A gold bug is one who explains the value of gold as an investment and thinks that its price will constantly rise. The United States issued gold certificates, the face value of which was identical to their face value in dollars, from 1879 to 1934, when the country abandoned the gold standard. Krugerrands are South African gold coins minted in 1967.# The London Metal Exchange (LME) is one of the largest commodity exchanges in the world. NYMEX is a commodity trading exchange founded in 1872 and acquired by the CME Group in 2008. Platinum is a metal used in jewelry, cars and electronics. A troy ounce is a metric unit for measuring the weight of precious metals. A depository receipt is a document issued to holders of futures contracts, especially for precious metals.