mineral resources and mining chapter 13. mining for... cell phones? large reserves of the metal...
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Mineral Resources and MiningC
HA
PT
ER
13
Mining for . . . Cell Phones?
• Large reserves of the metal tantalum are found in the Democratic Republic of the Congo, in Africa.
• Tantalum jumped in value in the 1990s as high-tech devices that need tantalum, such as cell phones, became common.
• There is international concern regarding the role tantalum mining has played in the extended conflict in the Congo.
Talk About It Is it important to think about the sources of the minerals we use?
Lesson 13.1 Minerals and Rocks
Over 4000 minerals have been identified, but only 1% of these are common in Earth’s crust.Amethyst
What Are Minerals?
Minerals are:
• _______
• ________ (no C-H bonds)
• __________
• ______
•With a ___________________________*
*Can vary over a limited range that does not affect the crystal structure
Lesson 13.1 Minerals and Rocks
Pyrite (Fool’s Gold)
Natural
Inorganic
Crystalline
Solid
Definite Chemical Composition
•__________ substances are not made of _____________ or the ________ of living things. *No Carbon-Hydrogen Bonds
NOR
What Are Minerals?
Inorganic
Living Things Remains
•A mineral may be an _________ (Native element, Ex.: ________).
•A mineral may be a ___________ (Ex.: _______---SiO2)
•The two most abundant elements found in minerals are ________ and _______.
What Are Minerals?
Element
Compound
Silicon Oxygen
Copper
Quartz
Mineral or NOT
SteelNot a mineral.
Man-made
Lumber Not a mineral
Organic
Coal Not a mineralOrganic
Mineral or NOT
“Hope Diamond”Mineral
OilNot a mineral
Liquid and Organic
Properties of Minerals
Lesson 13.1 Minerals and Rocks
Property Description
• Color A few minerals can be identified by their color. But color varies in most minerals depending on how they form.
• Streak The streak of a mineral is the color of its powder. Although mineral color may vary, streak color does not.
• Luster How light is reflected off a mineral’s surface is called luster. It may be described as glassy, earthy, silky, metallic, etc.
• Crystal A mineral can be identified by the particular arrangement of its atoms.
• HardnessMohs scale ranks mineral hardness 1–10. 1 = talc, which can be scratched by a fingernail. 10 = diamond, which can scratch all known common minerals.
• Cleavage A mineral that splits easily along a flat surface and forms a new “face” is said to have cleavage.
• Fracture Minerals that break irregularly, rather than leaving a flat surface, have fracture, not cleavage.
• Density Each mineral has a characteristic density—mass per unit volume.
Color•____________________ in mineral identification
•Small amounts of different __________ or formation conditions can give the ________________________. Ex. Quartz
Least Useful Property
ElementsSame Mineral Different Colors
•Some ________________________________.
All of these minerals have a green color however, they are all very different.
Calcite Fluorite Smithsonite
Color
different minerals are the same color
• The color of a mineral in its ____________ form.
• The ________ of a mineral can vary from sample to sample, but the _________ doesn’t. Ex. Hematite
StreakPowdered
ColorStreak
•Used to describe how _____ is reflected from the surface of a mineral.
•Luster can be _______ or __________.
Luster
Light
Metallic Non-Metallic
•Quartz – _______ Luster
•Mica – _______ Luster
•Kaolin – _______ Luster
•Gypsum (satin spar) – _____ Luster
•Talc – _____ Luster
LusterGlassy
Pearly
Earthy
Silky
Waxy
•The visible expression of a mineral’s _________ _______________________.•Every mineral has a distinct ________ form.•Usually only happens when there is enough _______ to grow.•Ex. Cubic: Calcite
Crystal Structureinternal
arrangement of atomsCrystal
Room
•A measure of the ____________ of a mineral to being ____________.
•Standard scale of hardness called the ______ Hardness Scale (scale of 1-10; 10 is hardest).
•______ is softest and ___________ is the hardest.
Hardness
ResistanceScratched
Mohs
Talc Diamond
Hardness
1. ___________ - the tendency of a mineral to cleave or break along __________ surfaces.
–Ex. Mica—cleaves along one flat plane (breaks the silicon-oxygen bond)
BreakageCleavage
Flat, Even
2. _________-the _________________ of a mineral.
–Minerals that break into smooth, __________ surfaces (Ex. Quartz) show conchoidal fracture
–Some minerals _____________________ (Ex. Asbestos)
–Some minerals have an ___________ fracture
BreakageFracture Uneven breakage
Curved
Splinter into fibers
Irregular
Density
•_____________(D = M/V)
•The density of a pure mineral is a __________.
Mass per Volume
Constant value
Mineral Formation•Minerals can form in four ways:
1) ______________________________
• _________ (inside the Earth) cools slowly and forms large crystals
• _______ (on Earth’s surface) cools quickly and forms small crystals
2) ________________ – a liquid in a solution evaporates & the remaining solids crystalize
Lesson 13.1 Minerals and Rocks
Salt basins of the Sierra Nevada The Miwok people filled these basins with water from a salt spring and let it evaporate, to form salt for trading.
Crystallization from magma or lava
Magma
Lava
Precipitation
Mineral Formation•Minerals can form in four ways:
3) ____________________________
•Great changes in temperature or pressure may cause one mineral to change into another
• _____________ – minerals which consist of the same ____________ but have difference __________ structures due to different formation conditions
• Ex. ____________ (formed in the mantle) & _____________ (formed in the crust)
Lesson 13.1 Minerals and Rocks
Temperature & Pressure
PolymorphElementsCrystal
DiamondGraphite
Mineral Formation•Minerals can form in four ways:
4) __________________________
•Organisms form inorganic minerals to produce hard structures that provide protection or ___________
• Ex. _______________________ in Shells & Coral & Calcium Phosphate in fish bones
Lesson 13.1 Minerals and Rocks
Produced by Organisms
Support
Calcium Carbonate
Mineral Classes• Minerals are classified based on their ____________ or
compounds.
Lesson 13.1 Minerals and Rocks
Elements
Rocks•Rocks are naturally occurring solids
________________________ and mineral-like materials
•Rocks can be made up of ___________ of mineral or many ____________ types of minerals (and mineral-like materials)
• A mineral is ______ a rock, rocks are _____________ of minerals
Lesson 13.1 Minerals and Rocks
Made up of Minerals
One TypeDifferent
NOTMADE UP
Rocks•The ____________ slowly changes rocks from one type to another through ________, melting, cooling, _____________, and erosion.
•Three types: igneous, sedimentary, metamorphic
Lesson 13.1 Minerals and Rocks
Rock CycleHeating
Weathering
Igneous Rocks
•_______ rocks are formed from the __________________.IgneousCooling of Liquid Rock
Igneous Rocks
2 Main Types of Igneous Rocks:
1) ___________ igneous rocks •Form ________________the surface and have been cooling for millions of years.•These rocks are characterized by _______ crystals.
• Ex. _________
IntrusiveDeep Beneath
Large
Granite
Igneous Rocks
2 Main Types of Igneous Rocks:
2) ____________ igneous rocks – • Form on the __________ of the
earth.•When lava erupts out of a volcano
it ________________ and there is little to no crystal growth.
• Ex. _____________________
ExtrusiveSurface
Cools Rapidly
Obsidian or Pumice
Igneous Rocks
Sedimentary Rocks•Made from an _______________ of various types of ______________.
What is sediment?
•Fragments that result from the weathering of ______, ___________, and ___________________.
•Ex. Gravel, clay, silt, pebbles, sand, mud, shells, dirt
AccumulationSediment
RocksMinerals Organic Material
Sedimentary Rocks
Most sedimentary rocks form _______________. •Ex. ____________
Under WaterLimestone
Sedimentary Rocks
Sedimentary Rock Forms Through These 4 Processes:1) _____________: sediments are pushed together and as a result, ___________ are squeezed out.
2) ______________: water passes through the sediments and dissolved minerals left behind act as a ________ to hold the ___________ together.
CompactionWater & Air
Cementation
Cement Sediments
Sedimentary Rock Forms Through These 4 Processes:3) _____________: minerals ______________ and fall out of solution
4) _____________: Water evaporates and leaves ____________________ behind.
Sedimentary Rocks
Precipitation Clump Together
EvaporationDissolved Minerals
Sedimentary RockThere are 3 types of sedimentary rock:1) __________: • Formed from fragments of _______________ which
have been ______________ and eroded• Ex. _____________ (sand) & ________ (silt or clay)
ClasticOther Rocks
WeatheredSandstone Shale
Sedimentary RockThere are 3 types of sedimentary rock:2) ______________: • Formed from minerals that were once
_______________ in water.• Either the minerals “________” out of the water
(precipitates) or the water _______________ leaving the minerals behind (evaporites)• Ex. Chemical Limestone (CaCO3)
Gypsum (CaSO4), halite (NaCl)
Chemical
DissolvedSettle
Evaporates
Sedimentary RockThere are 3 types of sedimentary rock:3) ________________• Formed from the remains or traces of _____________
and/or __________• Ex. Coal (plants), chalk (animal skeletons), organic
limestone (shells-CaCO3)
BiochemicalAnimals
Plants
White Chalk Cliff in Dover, England
Sedimentary RocksFeatures:• ________________: (aka. Layering) occurs when
there is a change in the _______ of sediment deposited.
• Ex. Grand Canyon
StratificationKind
Features:• _________________: formed from the action of
__________________ on sand (seen in sandstone)
Sedimentary Rocks
Ripple MarksWind or Water
Features:• __________: remains or traces of plants and/or
animals
Sedimentary Rocks
Fossils
•Rock formed from ________________ (igneous, sedimentary, or metamorphic) as a result of intense ________ (from magma) and _____________ (plate tectonics).
•Most metamorphic rock forms _____________________ of the earth.
Metamorphic RocksOther Rocks
Heat Pressure
Below the Surface
• __________ metamorphism occurs when the heat from hot magma changes the composition of surrounding rocks.• ___________ metamorphism occurs over large areas of tectonic activity.
Contact
Regional
•Metamorphic rocks are classified according to their _______.
•Foliated or Nonfoliated?
Metamorphic Rocks
Structure
Metamorphic Rocks
Foliated• ____________ flattens the mineral crystals and
pushes them into ___________ bands.•Minerals with different _______________ separate
into different bands• EX. Slate, schist, gneiss
PressureParallel
Densities
Metamorphic RocksNonfoliated• ______________________________• EX. Quartzite, marbleNo Visible Parallel Bands
Metamorphic Rocks
Parent RocksShale (sedimentary) → SlateSlate (metamorphic) → SchistSchist (metamorphic) → GneissGranite (igneous) → Gneiss Limestone (sedimentary) → MarbleSandstone (sedimentary) → Quartz
Shale
Slate
Schist
Gneiss
Lesson 13.2 Mining
More than a ton of waste may remain after extracting just a few hundredths of an ounce of gold.
What Is Mined?
Lesson 13.2 Mining
• Ores: ______________________ that are mined so ________ or metals can be removed
• Nonmetallic minerals: Minerals that as a whole have valuable properties Ex. _____________________
• Fuels: Minerals that can be used to _________________ Ex. Coal & Uranium
Groups of MineralsMetal
Gemstones & SandGenerate Energy
Mining Methods
Lesson 13.2 Mining
From initial exploration to disposal, mining and mineral use involves many steps.
Mining Methods
Lesson 13.2 Mining
1) _______________ – layers of ______________________ are removed from large areas of land to expose a resource
• Used when a resource occurs in _____________________ deposits
• Used for coal, sand & gravel
Strip Mining Surface Soil & Rock
Shallow, Horizontal
Mining Methods
Lesson 13.2 Mining
2) ______________________ – vertical shafts are dug deep into the ground & networks of ______________________ are dug of blasted out to follow deposits of a resource
• Used when resources are concentrated in pockets or seams _______________________
Did You Know? Some subsurface mines in South Africa extend 4 km underground.
Subsurface MiningHorizontal Tunnels
Deep Underground
Mining Methods
Lesson 13.2 Mining
3) ___________________ – digging a ______________ and removing ore and the unwanted rock that surrounds the ore
• Used when a mineral is ____________________ distributed throughout a rock formation or when the ground is unsuitable for tunneling
Open Pit Mining Large Hole
Widely & Evenly
Mining Methods
Lesson 13.2 Mining
4) __________________________ – forests are clear cut, topsoil is removed and rock is ________________ to expose a resource.
• Repeated cycles of blasting can remove ____________ of feet of mountaintop
• Used primarily for ______
Mountaintop RemovalBlasted Away
Hundreds
Coal
Mining Methods
Lesson 13.2 Mining
5) __________________– a chemical solution or water is pumped into a mine to _________ the desired resource out of an ore
• Mostly used to remove _____
Solution MiningLeach
Salt
Mining Methods
Lesson 13.2 Mining
6) ________________ – sifting through material in modern or ancient ____________ deposits
• Running water is used to separate mud from valuable minerals
• Ex. ________________________ of 1849
Placer MiningRiverbed
California Gold Rush
Mining Methods
Lesson 13.2 Mining
7) ____________________ – mining that takes place _____________
• Includes ____________(vacuuming up materials)
• Exploration of _________________ vents
Undersea MiningUndersea
Dredging
Hydrothermal
Processing Ore
Lesson 13.2 Mining
• Ores must be processed to gain access to the metals they contain:
1) _________________ & ground.
2) Crushed ore is separated into _______________________
*Tailing – waste product
• The extraction of a few hundredths of an ounce of gold can produce ____________ of tailings
Ore is crushed
Metals & Tailings
One Ton
Processing Ore
Lesson 13.2 Mining
• Ores must be processed to gain access to the metals they contain:
3) Concentrated metals are further processed, often by ______________.
*Smelting – heating ore beyond its _________ point
Smelting
Melting
Lesson 13.3 Mining Impacts and Regulation
There are about $314 million worth of metals contained in unused cell phones in the United States alone.
Environmental Impacts of Mining
Lesson 13.3 Mining Impacts and Regulation
• Increased __________
• Sediment and debris ____________________.
• ______ drainage – when _______________ in rocks is exposed to oxygen and water it can form ________________ which leaches off metals and washes into waterways
• ___________________ – tailings leak out of impoundments or dams
• _______________
• Disruption of _________ ecosystems (undersea mining)
ErosionClog Waterways
Acid Iron SulfideSulfuric Acid
Water Pollution
Air PollutionOcean
Acid Drainage and the Metals it Leaches Off
Social Impacts of Mining
Lesson 13.3 Mining Impacts and Regulation
• Property damage caused by _______________________ or mine collapse
Mountain Removal
Social Impacts of Mining
Lesson 13.3 Mining Impacts and Regulation
• Although mining can bring _________________ to poor areas of the world, ____________________ can arise over mineral rights.• Ex. Diamonds in West Africa
Money & JobsViolent Conflicts
Social Impacts of Mining
Lesson 13.3 Mining Impacts and Regulation
• Mining can be hazardous to the _________ of the miners.Ex.
____________________________________________________
HealthBlack Lung Disease & Mine Collapse
General Mining Law of 1872
Lesson 13.3 Mining Impacts and Regulation
• Created rules to __________ mining activity, but also ___________ mining
• Governs the mining of ___________ minerals (gold), uranium, materials used for building & diamonds
• Public land can be claimed and leased from the government for mining by:
• A ___________________________________
• A person who has declared intent to become a citizen
• A ______________ with permission to do business in the US
RegulatePromoted
Metallic
US Citizen of Legal Age
Company
General Mining Law of 1872
Lesson 13.3 Mining Impacts and Regulation
•Whoever holds the lease has the sole right to minerals taken from the claimed area
• Lease holder does ______ have to pay the government any part of the ___________________ from the land
• Claim owners can file to patent, or own, the land for __________________
• Amendments are currently being considered
NOTProfits Earned
$5 per acre
Mining Leasing Act of 1920
Lesson 13.3 Mining Impacts and Regulation
• Developed due to the discovered worth of ______________
• Governs the leasing of public lands for fossil fuel, phosphate, sodium, and sulfur mining.
• Annuals ___________________________ are on the products extracted must be payed by the people who lease land for this purpose
Fossil Fuels
Rental Fees & Royalties
Surface Mining Control & Reclamation Act (1977)
Lesson 13.3 Mining Impacts and Regulation
• Land must be ____________ after a mining operation is complete
• Mining companies must post bonds to cover reclamation costs _______________________a mining operation
• Companies must:
• Remove ________________ built
• Replace the rocks and soil that were removed
• Fill in _________
• Plant vegetation
• Even when all of the requirements are met, the land is still not _____________________ prior to mining
Restored
Prior to Beginning
Structures
Shaft
Exactly like it was
Reclamation
Mine Safety
Lesson 13.3 Mining Impacts and Regulation
• First law, passed in 1891, established ______________ requirements for coal mines and prohibited miners ___________.
• Today, the Federal Mine Safety & Health Act of 1977 regulates mine safety.
• In 2010, an underground explosion in a West Virginia mine killed _____________.
Ventilation
Under 12
29 Miners
Responsible Mineral Use
Lesson 13.3 Mining Impacts and Regulation
• Minerals are __________________ resources.
• Reducing use, reusing, and recycling minerals can help minimize the negative impacts of mining and address limited supplies.
Did You Know? Extracting aluminum ore takes 20 times more energy than obtaining it from recycled sources.
Nonrenewable