mineral resources. nonrenewable mineral resources earth crust = minerals + rock minerals...
TRANSCRIPT
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Mineral Resources
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Nonrenewable Mineral Resources
Earth crust = Minerals + rock Minerals –inorganic compound that occurs
naturally in the earth’s crust Solid Regular internal crystalline structure.
Rock – solid combination of 1 or more minerals.
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Minerals are the building blocks of all rocks.
If minerals make up rocks, what makes up minerals?
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Minerals are made up of complex structures of elements. There are eight elements that make up most of these minerals; Oxygen, Silicon, aluminum, iron, calcium, sodium, potassium, and magnesium; they account for about 98% of the earths crust.
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Silicates vs. Non-silicatesSilicates:
Most abundant minerals on earths surface
Composed of Silicon and Oxygen
Have a complex structure because of the way silicon and oxygen bond
•Non-silicates:•Make up only about 8% of the earths crust•Not a very complex structure
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Quartz= SiO2
Hematite= Fe2O3
Halite= NaCl Tephroite- Mn2SiO4
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Mining
What is mining?
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What can be mined?Mineral Resource: Any mineral useful to
humansMetallic Minerals: Iron Oxide, GoldNon-metallic mineral: Limestone, sandFossil Fuel; Coal, Petroleum
Ore: a natural material whose concentration of economically valuable minerals is high enough for the material to be mined profitablyHigh Grade Ore; has high concentration of the
mineralLow Grade Ore: smaller concentration
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Mining can be done in two different ways…Surface miningSubsurface mining
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Surface Mines
Surface mining is used when mineral deposits are located at or near the surface of the earth.
Used to remove mineralsTypes include
open pits—used to remove large, near-surface deposits such as copper and gold
surface coal mine—known as strip mining because the coal is removed in strips
Quarries—open pits that are used to mine building stone, crushed rock, sand and gravel
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Extracting Mineral DepositsSurface mining - shallow deposits in US extracts 90% of non-fuel minerals and
rocks and 60% of the coal.
Open-pit Mining Area Strip Mining
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Mountaintop Removal
Figure 15-14Figure 15-14
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Extracting Mineral Deposits
Subsurface mining - deposits that are too deep for surface miningRequires passages be dug into earth to reach the ore
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Underground MinesGenerally less disruptive than surface mines
Tunnels closely follow the ore body
Some waste rock on the surface
Shallow abandoned mines can cause collapse
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Problem!!!Mining can destroy or disturb the habitats of plants and animals.
Waste products from mine get into water sources—pollutes surface water and ground water.
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Acid Mine Drainage
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SolutionsReclamation: The process of returning land to its original condition after mining is completeRequired by law since the 1970’s
Reduce our need from minerals
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Assignment
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