Used in dentistry and medicine, in jewelry and arts, in medallions and
coins, in ingots as a store of value, for scientific and electronic
instruments, as an electrolyte in the electro-plating industry. South
Africa has about half of the world’s resources. Significant quantities
are also present in the U.S., Australia, Brazil, Canada, China, and
Russia.
Background
Gold is described and known as a precious metal. The combination of
gold’s relative scarcity and its obvious beauty has made it a very
valuable commodity throughout the history of humanity. It is most
probably the oldest precious metal known to man. Wars have been fought
over it and countless numbers have died trying to gain it or protect it.
Scientifically speaking, gold is an element, a metal, with an atomic
number 79. Its physical and chemical properties make it ideal for a
number of applications. It is very stable and as a result seldom
combines with other elements. In other words, it does not corrode or
rust. It conducts electricity very well (only silver and copper are
better conductors of electricity). It conducts heat very well. Gold is
very malleable which means it can be hammered into shapes. Gold is so
malleable that it can be hammered into a sheet so thin that light can
pass through it. It is also ductile, which means it can be drawn into
long, thin wires: a wire thread approximately 50 miles long can be drawn
from a single troy ounce of gold (31.1 grams). It is also one of the
densest metals: a cubic foot of gold weighs over 1,200 pounds.
Name
Gold’s chemical symbol is Au. It comes from the Latin word aurum which
means shining dawn, a reference to its bright yellow color and shiny
luster. The English word gold has its origins in Middle English.
Sources
Gold is found in two major types of deposits. Lode deposits are
deposits where gold is found in cracks and veins in rocks. These are
also called vein deposits. The second type of gold deposit is called a
placer deposit. Placer deposits are formed by moving water that has
eroded gold out of lode deposits. When the speed of the water in a river
slows sufficiently, the heavy gold falls to the bottom and accumulates
in the sand of the riverbed. A third major source of gold is as a
by-product of copper and silver mining. Gold is so valuable that it is
worth the effort to recover even minute amounts from copper and silver
ore.
It is estimated that the total amount of gold yet to be retrieved from
the Earth is 100,000 tons. South Africa is the world’s largest producer
of gold and is estimated to have half of these gold resources. The
United States and Brazil each have significant amounts of the world’s
gold resources. Approximately one-fifth of the total resources of gold
in the world is by-product from copper and silver ores.
In the United States, Alaska and Nevada are the main producers of gold.
Nevada produces the majority of the gold produced in all of the United
States. The remaining are from placer deposits in Alaska, and other gold
deposits in western states. Most of the gold recovered in the United
States is recovered by only about 30 mines. The largest gold mines in
the United States today are located in northern Nevada.
Brazil and Canada export significant amounts of gold to the United States.
Uses
Most gold is used to make jewelry and other art items. Because it is
chemically stable and conducts electricity so well, it is very important
in electronics. Electronic applications represent a significant amount
of the United States’ annual gold consumption, followed by dentistry and
a variety of other applications.
Gold has been very important as the standard for currency. In 1792, the
United States Congress established gold and silver as the standard for
the nation’s money. The U.S. Department of the Treasury holds a major
stockpile of gold.
Substitutes and Alternative Sources
Palladium, platinum and silver have been substituted for gold. Alloys
(mixtures) of gold and other base metals are extensively used in jewelry
and electronics to reduce the amount of gold used while assuring the
positive features for which gold is desired.
Traditional mining of lode and placer deposits and by-product
production of gold from copper and silver mining will continue to be the
main sources of gold. There is gold in seawater, but recovering this
gold is unlikely to ever be profitable. Recycling gold from used
electronics will provide only a very small amount of gold, though some
do find this venture profitable.