Are you worth your weight in Gold? - Minerals Downunder - Australian Mines

Atlas
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** How does Gold form? **

The most common natural method of concentration of gold is through the
ancient action of hot fluid inside the Earth's crust. (Fluids deep in the
crust are heated by the Earth's internal heat. As they move towards the
surface they cool down.)

Animated file of how gold is created

The fluids moved through the rocks over a large area and "dissolved" the
gold. When these fluids cooled or reacted with other rocks the dissolved
gold precipitated (came out of the fluid) in cracks or fractures forming
veins.

If the fluids move over a large enough area, and dissolve the gold for a
long enough period of time, gold can be concentrated in amounts in the
parts per thousand or even greater.

As well as gold, the fluids carried other dissolved minerals, such as
quartz. This is why gold is often found with quartz. These are known as
primary gold deposits and to extract the gold the rock containing the veins
of gold has to be dug up (mined), crushed and processed.

gold within quartz

In Australia this concentration of gold took place in the Earth hundreds of
millions of years ago in the eastern states, and thousands of millions of
years ago in Western Australia.

The rocks containing the gold veins have now been exposed on the surface
and are eroding away. The gold that these rocks contained has been washed
down into creeks to form alluvial gold deposits. Here, the gold is further
concentrated by the action of water.

Because gold is heavier than most of the material moved by a creek or
river, it can become concentrated in hollows and trapped in the bed of the


Source: www.australianminesatlas.gov.au/education/down_under/gold/formed.html


how is gold formed


Gold - Wikipedia, the free encyclopedia

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** Gold **

From Wikipedia, the free encyclopedia
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"Element 79" redirects here. For the short story and anthology by Fred
Hoyle, see Element 79 (anthology).
This article is about the metal. For the color, see Gold (color). For other
uses, see Gold (disambiguation).
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Gold
*[79]Au*
Ag
↑
*Au*
↓
Rg Hydrogen (other non-metal) Helium (noble gas)Lithium (alkali
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non-metal) Chlorine (halogen) Argon (noble gas)Potassium (alkali
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non-metal) Bromine (halogen) Krypton (noble gas)Rubidium (alkali
metal) Strontium (alkaline earth metal) Yttrium (transition
metal) Zirconium (transition metal) Niobium (transition
metal) Molybdenum (transition metal) Technetium (transition
metal) Ruthenium (transition metal) Rhodium (transition
metal) Palladium (transition metal) Silver (transition
metal) Cadmium (transition metal) Indium (post-transition
metal) Tin (post-transition
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gas)Caesium (alkali metal) Barium (alkaline earth
metal) Lanthanum (lanthanoid) Cerium (lanthanoid) Praseodymium (lanthanoid) Neodymium (lanthanoid) Promethium (lanthanoid) Samarium (lanthanoid) Europium (lanthanoid) Gadolinium (lanthanoid) Terbium (lanthanoid) Dysprosium (lanthanoid) Holmium (lanthanoid) Erbium (lanthanoid) Thulium (lanthanoid) Ytterbium (lanthanoid) Lutetium (lanthanoid) Hafnium (transition
metal) Tantalum (transition metal) Tungsten (transition
metal) Rhenium (transition metal) Osmium (transition
metal) Iridium (transition metal) Platinum (transition
metal) Gold (transition metal) Mercury (transition
metal) Thallium (post-transition metal) Lead (post-transition
metal) Bismuth (post-transition metal) Polonium (post-transition
metal) Astatine (halogen) Radon (noble gas)Francium (alkali
metal) Radium (alkaline earth
metal) Actinium (actinoid) Thorium (actinoid) Protactinium (actinoid) Uranium (actinoid) Neptunium (actinoid) Plutonium (actinoid) Americium (actinoid) Curium (actinoid) Berkelium (actinoid) Californium (actinoid) Einsteinium (actinoid) Fermium (actinoid) Mendelevium (actinoid) Nobelium (actinoid) Lawrencium (actinoid) Rutherfordium (transition
metal) Dubnium (transition metal) Seaborgium (transition
metal) Bohrium (transition metal) Hassium (transition
metal) Meitnerium (unknown chemical properties) Darmstadtium (unknown
chemical properties) Roentgenium (unknown chemical
properties) Copernicium (transition metal) Ununtrium (unknown chemical
properties) Flerovium (unknown chemical properties) Ununpentium (unknown
chemical properties) Livermorium (unknown chemical
properties) Ununseptium (unknown chemical properties) Ununoctium (unknown
chemical properties)Periodic table


platinum ← **gold** → mercury

Appearance
metallic yellow

General properties
Name, symbol, number gold, Au, 79
Pronunciation /ˈɡoʊld/
Element category transition metal
Group, period, block 11, 6, d
Standard atomic weight 196


Source: en.wikipedia.org/wiki/Gold

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