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Transcript of gold
Atomic #: 79
Mass #: 197
How is it mined?
There are several ways gold can be mined.
2 ways of doing so are:
Gold panning, wide shallow pans filled with multiple things (sand,gravel,gold) are put under water and shaken to separate the sand and gravel from the gold. This method is not often used as there are simple ways of mining for gold.
Open-Pit mines: "overburden" trees and anything living above the place that its about to be mined is destroyed and removed. Then the ore is blasted and scooped out. Open pit mines are more commonly seen today.
Dangers of open-pit mines: Gold itself is very stable but
mining it is very dangerous.
hurts the environment
produces 8-10 times more waist/pollution then underground mining
rarely still found as nuggets
extracted chemically from ore with a cyanide leaching process
Malleable an ductile
Density= 19.3g/cm3 ( Very heavy metal)
Shinny and yellow in a mass state.(solid state)
Melting point= 1,064 degreesC
Conducts electricity very well
Giant metallic structure
Malleable: when a metal is pounded into a flat sheet. metals are malleable non metals are not.
Ductile: objects that can be stretched into wire.
Density: the amount of matter that occupies a certain space.
Bullion: an ornamental braid/trimming made with twists of gold)
Aurous and Auric are both formed by gold
Resistant to the effect of most acids
Doesn't corrode easily
Doesn't combine easily with oxygen or halogens
Uses: Ever scene gold has been discovered it has been used for many things here are some examples.
Jewelery (main usage)
Gold coins (used to be very popular)
How is it purified?
How the gold is purified depends on how much purity it already contains. Gold must go through a purification process to be sold.
Low grade ore:
Broken into chunks and diluted with a cyanide solution.
High grade ore:
Sent to a grinding mill and made into power.
Contains sulfide and carbon. Heated to over 1,000 degreesF (removes sulfide/carbon)