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blue bowl mining precious metals

blue bowl mining precious metals

Aprecious metalcontaining 10 percent othermetalsis said to be 900 fine or to have a fineness of 900. Purity of a gold (or platinum) alloy may also be stated in karats. One karat is 1/24 part by weight of the total mass; pure gold (999 fine to 1000 fine) is 24-karat gold. 18-karat gold is an alloy of 75% gold or 750 fine

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