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The first stage in making metals is to mine the ore-bearing rock. Sometimes huge amounts of ore are needed to make a small amount of metal � most copper, for instance, exists in sulphide ores that include as little as 0.25% copper. The metal then needs to be extracted from the rock using furnaces and electrolytic processes. Finally, earlier than the metal can be used, it often has to bear further processing.
The expertise coin of gold in use during the durations of Grecian historical past both earlier than and through the time of the life of Homer weighed between eight.42 and eight.75 grams. From an earlier choice in using silver, European economies re-established the minting of gold as coinage during the thirteenth and fourteenth centuries.
The gold proportion (fineness) of alloys is measured by karat (k). Pure gold (commercially termed fine … Read More