e traction of gold bbc bitesize

Extraction of Metals. Alloys-containing Gold.. Pure gold is very soft. Gold is mixed with silver and copper in different amounts to make an alloy which is harder and stronger.. The percentage of gold in an alloy is measured in carats or fineness. 100% pure gold is 24 carats, 75% gold is 18 carats 50% gold is 12 carats and 37.5% gold is 9 carats. The available percentage of gold in jewellery

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