Origin of name: From the Anglo-Saxon word "gold" (the
origin of the symbol Au is the Latin word "aurum" meaning
"gold")
Gold was known and highly valued from earliest times. Egyption
inscriptions dating back to 2600 B.C. describe gold and gold is
mentioned several times in the Old Testament.
Gold is one of the elements which has an alchemical
symbol, (alchemy is an ancient pursuit concerned with, for instance,
the transformation of other metals into gold).
Gold is found as the free element in nature and
associated with quartz, pyrite and other minerals. Two thirds
of the world's supply comes from South Africa. Much of the USA
production is from the states South Dakota and Nevada. Gold is
found in sea water (about 5-6 g in a million tonnes of seawater),
but no effective economic process has been designed (yet) to extract
it from this source.
Gold has been the basis of many currencies over
the centuries and so for economic reasons —among others—the
possession of gold was or is restricted in some countries. Notably,
private ownership of gold (apart from as jewellery and coins)
was banned between 1933 and 1975.
Gold has been used for centuries for jewellery
and decoration. In addition to the more familiar rings, brooches,
necklaces and ear-rings, gold is used as gold leaf for decoration
and protection, screen printing (directly on to bone china, earthenware,
porcelain and glass surfaces or decals).
Gold is the key component of "liquid gold,"
preparations containing up to 12% gold ideal for decorative application
using brushes and gold pastes used for screen printing.
Gold is also well known as a coinage metal (because
of its scarcity, inertness, and decorative features) and is a
standard for monetary systems in many countries. Apart from gold
coins, gold ingots and gold bars; gold is available in many forms
including pure gold and alloys as gold flakes, foil gauzes (meshes),
grain, powders, sheet, sponges, tubes, wires and even single gold
crystals.
Recently, gold catalysts as gold supported on
carbon or metal oxides are becoming useful in the chemical industry.
Many other gold compounds including neutral gold halides (AuBr3,
etc.), aurates (K[AuBr4], etc.) gold cyanides, gold oxides, phosphine
gold complexes, gold hydroxides and gold nitrates are available
to industrial users. Chlorauric acid (HAuCl4) is used in photography
for toning the silver image.
Gold is a really useful metal for electronics
because of its inertness and its unique physical properties. Gold
is used for electrical contacts, spring contacts, bonding wire,
solder alloys, bumping wire, electroplating and sputtering targets.
Gold is also a useful brazing material. Gold is used for coating
space satellites, as it is a good IR reflector and is inert.
Since gold is inert and possesses useful properties
when alloyed, gold is used extensively for dentistry in gold teeth,
dental attachments, inserts, and solders. Similarly, gold is used
increasingly for medical implants in eyes and ears, as well as
many other medically useful wires, tubes, sheets, and foils. Disodium
aurothiomalate is administered (intramuscular) as a treatment
for arthritis. The gold isotope 198Au is used for treating cancer
and other conditions.
Gold is used in nanotechnology applications as
colloids, conjugates, nanoparticle inks, nanoparticle solutions
and nanopowders.
Gold has been good to America. This ancient metal—the
first used by man and still prized above all others—today
plays a more vital role in the life and health of our nation than
ever before.
Gold has become essential in today's high tech
world. It ensures the proper functioning of the most sensitive
electronic instruments. In national defense. In telecommunications.
In advanced biomedical research. In many other ways that ensure
our health and safety at home, at work, on the road and in the
air.
The Pentagon specifies gold for critical instruments
that may make the difference between life and death. Gold circuitry
helped save the life of Air Force Captain Scott O'Grady when his
plane was shot from the skies over Bosnia a few years ago. NASA
specifies gold for sensitive spacecraft instruments to ensure
the safety of astronauts. Air traffic controllers depend on gold
for the flawless operation of radar equipment around the clock.
On America's roads, hundreds of lives are saved
and thousands of serious injuries prevented each year by the gold
circuits in electronic sensors that ensure airbags operate without
fail.
Gold is used in all these technologies because
of its unmatched reliability. It is not affected by extremes of
heat, cold or damp. It does not rust, tarnish or corrode. It remains
a superior conductor of electricity under all circumstances. It
is amazingly flexible. And it is virtually indestructible.
Gold has been good to America in many other ways.
The extraction of gold from otherwise barren rock formations has
created tens of thousands of well-paid jobs, not only in the West
but in 46 other states that make the modern equipment needed to
find and extract gold more efficiently, more precisely, and with
less disturbance to the natural environment. For every million
dollars worth of gold produced, the local economy grows by nearly
$2 million and household earnings increase over $500,000.
Gold has been especially good to our national
economy. As recently as 1980, most of our gold had to be imported.
Today, because of new technologies, we are able to produce domestically
all the gold needed for defense, communications, aviation, medical
research, computers, automobile afety and other important applications.
Gold also generates billions of dollars of income
for other industries throughout the United States. Each year,
gold production contributes hundreds of millions in state and
local taxes to fund roads, schools, hospitals, universities and
other facilities. It also provides over $500 million a year to
the federal treasury. And it strengthens America's balance of
trade by providing over $1.5 billion a year in exports.
The development of our modern, high-tech gold
industry is an American success story. It has made our country
stronger, more independent, more competitive in the global marketplace.
And in many unseen ways, it has made life better, healthier and
safer for millions of people here and throughout the world.
"Thou shalt not defraud thy neighbour,
neither rob him: the wages of him
that is hired shall not abide with thee all night until the morning"—Leviticus
19:13
"You don't make the poor richer
by making the rich poorer."—Winston Churchill
"The firm basis of government is
justice, not pity."—Woodrow Wilson
"Take calculated risks. That is
quite different from being rash."—Gen. George S. Patton
"It's the economy, stupid."—Bill
Clinton
THE HEALING POWER OF GOLD
In medieval Europe, alchemists mixed powdered
gold into drinks to "comfort sore limbs," one of the
earliest references to arthritis.
Word of gold's power to relieve the pain of arthritis
passed down through the centuries. Its mysterious efficacy has
been confirmed by modern medical research. Today it is widely
used, in combination with other compounds, in the treatment of
rheumatoid arthritis.
In ancient Rome, gold salves were used for the
treatment of skin ulcers. Today, gold leaf plays an important
role in the treatment of chronic ulcers.
As long as 4,500 years ago, the Egyptians used
gold in dentistry. Remarkable examples of the artistry of these
early orthodontists have been found, perfectly preserved, by archaeologists
of our own time. Today, American dentists use some 13 tons of
gold each year for crowns, bridges, inlays and dentures. The reason?
Gold is non-toxic, it can be shaped easily, and it is tough—it
never wears, corrodes or tarnishes.
The use of gold in modern medicine began around
1890, when the distinguished German bacteriologist Robert Koch
discovered that compounds made with gold inhibited growth of the
bacillus that caused tuberculosis. His work was honored with the
Nobel Prize in Medicine.
Today, medical uses of gold have expanded greatly.
It is used in surgery to patch damaged blood vessels, nerves,
bones and membranes. And it is used in the treatment of several
forms of cancer. Injection of microscopic gold pellets helps retard
prostate cancer in men. Women with ovarian cancer are treated
with colloidal gold. And gold vapor lasers help seek out and destroy
cancerous cells without harming their healthy neighbors.
Gold has become an important biomedical tool
for scientists studying why the body behaves as it does. By attaching
a molecular marker to a microscopic piece of gold, scientists
can follow its movement through the body. And because gold is
readily visible under an electron microscope, scientists now,
for the first time, can see whether and where a reaction takes
place in an individual cell.
Some researchers are placing gold on DNA to study
the hybrid genetic material in cells. Others are using it to determine
how cells respond to toxins, heat and physical stress.
Because it is biologically benign, biochemists
use gold to form compounds with proteins to create new lifesaving
drugs. One experimental new gold compound blocks virus replication
in infected cells. It is being tested for the treatment of AIDS.
Every day, surgeons use gold instruments to clear
coronary arteries, and gold-coated lasers literally give new life
to patients with once inoperable heart conditions and tumors.
Around the world, the unique qualities
of gold are helping millions of people live longer, healthier
and more productive lives. One day, it may save your life.
|