Dore bar
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Major gold mines process ore at the site of the mine, creating a low-purity gold metal. This metal is poured into dore bars, which are then transported to refineries for further purification. Dore bars sometimes weigh as much as 25 kg, twice the size of a standard London Good Delivery bar.
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[edit] Associated Industry Codes
According the the United States Census Bureau [1], the creation of dore bars is conducted at establishments engaged either in "Gold Ore Mining" (NAICS Code 212221 [2]), or "Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum)" (NAICS Code 331419) [3].
[edit] Derivation of the Term
The term likely derives from French or Spanish. In each language, the verb doré means to gild or make golden. [4]
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