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A gold nugget of 5 mm (0.2 in) in diameter (bottom) can be expanded through hammering into a gold foil of about 0.5 m 2 (5.4 sq ft). The Toi gold mine museum, Japan.. Gold leaf is gold that has been hammered into thin sheets (usually around 0.1 μm thick [1]) by a process known as goldbeating, [2] for use in gilding.
On 3 May 2007, the Royal Canadian Mint unveiled a Gold Maple Leaf coin with a nominal face value of $1 million and a metal value of over $3.5 million, referred to as a Big Maple Leaf. [ 5 ] [ 6 ] It measures 50 cm in diameter by 3 cm thick and has a mass of 100 kg , with a purity of 99.999%.
A Big Maple Leaf measures 2.8 centimetres (1.1 in) thick and 50 centimetres (20 in) in diameter and is 999.99/1000 pure. The obverse of the BML shows Queen Elizabeth II as she has appeared on Canadian coinage since 2003, [5] when Susanna Blunt's design became the third iteration of the queen's effigy to appear on coinage (the others were 1965 and 1990).
Some metal leaves may look like gold leaf but do not contain any real gold. This type of metal leaf is often referred to as imitation leaf. [3] Metal leaves are usually made of gold (including many alloys), silver, copper, aluminium, brass (sometimes called "Dutch metal" typically 85% Copper and 15% zinc) or palladium, as well as platinum.
It is also known by other names such as "composition gold leaf", "Dutch gold", "Schlagmetal" and "Schlag leaf". [1] It is very malleable and ductile and so can be beaten into very thin sheets. These sheets are sold for use as metal leaf or imitation gold leaf. [2] The addition of arsenic produces an alloy with similar properties but coloured white.
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