1. Geology and Nonrenewable Mineral Resources
Chapter 14
Geology and Nonrenewable Mineral Resources
Iron Ore

2. Chapter Overview Questions
What major geologic processes occur within the earth and on its surface?
What are nonrenewable mineral resources and where are they found?
What are rocks, and how are they recycled by the rock cycle?
How do we find and extract mineral resources from the earth’s crust, and what harmful environmental effects result from removing and using these minerals?

3. Chapter Overview Questions (cont’d)
Will there be enough nonrenewable mineral resources for future generations?
Can we find substitutes for scarce nonrenewable mineral resources?
How can we shift to more sustainable use of nonrenewable mineral resources?

4. GEOLOGIC PROCESSES
The earth is made up of a core, mantle, and crust and is constantly changing as a result of processes taking place on and below its surface.
The earth’s interior consists of:
Core: innermost zone with solid inner core and molten outer core that is extremely hot.
Mantle: mostly solid rock with a rigid outer part (asthenosphere) that is melted pliable rock.
Crust: Outermost zone which underlies the continents.

5. Tectonic plate Inner core
Spreading center
Collision between two continents
Oceanic tectonic plate
Ocean trench
Oceanic tectonic plate
Plate movement
Plate movement
Tectonic plate
Oceanic crust
Oceanic crust
Subduction zone
Continental crust
Continental crust
Material cools as it reaches the outer mantle
Cold dense material falls back through mantle
Hot material rising through the mantle
Mantle convection cell
Figure 15.3
Natural capital: the earth’s crust is made up of a mosaic of huge rigid plates, called tectonic plates, which move around in response to forces in the mantle.
Mantle
Two plates move towards each other. One is subducted back into the mantle on a falling convection current.
Hot outer core
Inner core
Fig. 15-3, p. 337

6. GEOLOGIC PROCESSES
Major features of the earth’s crust and upper mantle.
next

7. Oceanic crust (lithosphere) Abyssal plain Continental slope
Folded mountain belt
Volcanoes
Abyssal plain
Abyssal floor
Oceanic ridge
Abyssal floor
Abyssal hills
Trench
Craton
Oceanic crust (lithosphere)
Abyssal plain
Continental slope
Continental shelf
Continental rise
Mantle (lithosphere)
Continental crust (lithosphere)
Mantle (lithosphere)
Figure 15.2
Natural capital: major features of the earth’s crust and upper mantle. The lithosphere, composed of the crust and outermost mantle, is rigid and brittle. The asthenosphere, a zone in the mantle, can be deformed by heat and pressure.
Mantle (asthenosphere)
Fig. 15-2, p. 336

8. INDIA-AUSTRALIAN PLATE
EURASIAN PLATE
NORTH AMERICAN PLATE
ANATOLIAN PLATE
JUAN DE FUCA PLATE
CARIBBEAN PLATE
CHINA SUBPLATE
ARABIAN PLATE
AFRICAN PLATE
PHILIPPINE PLATE
PACIFIC PLATE
SOUTH AMERICAN PLATE
NAZCA PLATE
INDIA-AUSTRALIAN PLATE
SOMALIAN SUBPLATE
Figure 15.4
Natural capital: the earth’s major tectonic plates. The extremely slow movements of these plates cause them to grind into one another at convergent plate boundaries, move apart from one another at divergent plate boundaries, and slide past one another at transform plate boundaries. QUESTION: What plate are you floating on?
ANTARCTIC PLATE
Divergent plate boundaries
Convergent plate boundaries
Transform faults
Fig. 15-4a, p. 338

9. GEOLOGIC PROCESSES
Huge volumes of heated and molten rock moving around the earth’s interior form massive solid plates that move extremely slowly across the earth’s surface.
Tectonic plates: huge rigid plates that are moved with convection cells or currents by floating on magma or molten rock.
Tectonic plates move at approximately the same speed that fingernails grow.

10. The Earth’s Major Tectonic Plates
The extremely slow movements of these plates cause them to grind into one another at convergent plate boundaries, move apart at divergent plate boundaries and slide past at transform plate boundaries.
Figure 15-4

11. Transform fault Rising magma
Trench
Volcanic island arc
Craton
Transform fault
Lithosphere
Rising magma
Subduction zone
Lithosphere
Lithosphere
Asthenosphere
Asthenosphere
Asthenosphere
Figure 15.4
Natural capital: the earth’s major tectonic plates. The extremely slow movements of these plates cause them to grind into one another at convergent plate boundaries, move apart from one another at divergent plate boundaries, and slide past one another at transform plate boundaries. QUESTION: What plate are you floating on?
Divergent plate boundaries
Convergent plate boundaries
Transform faults
a.k.a. transform plate boundaries
Fig. 15-4b, p. 338

12. Figure 15.4
Natural capital: the earth’s major tectonic plates. The extremely slow movements of these plates cause them to grind into one another at convergent plate boundaries, move apart from one another at divergent plate boundaries, and slide past one another at transform plate boundaries. QUESTION: What plate are you floating on?
Fig. 15-4, p. 338

13. INDIA-AUSTRALIAN PLATE
EURASIAN PLATE
NORTH AMERICAN PLATE
ANATOLIAN PLATE
JUAN DE FUCA PLATE
CARIBBEAN PLATE
CHINA SUBPLATE
ARABIAN PLATE
AFRICAN PLATE
PHILIPPINE PLATE
PACIFIC PLATE
SOUTH AMERICAN PLATE
NAZCA PLATE
INDIA-AUSTRALIAN PLATE
SOMALIAN SUBPLATE
Figure 15.4
Natural capital: the earth’s major tectonic plates. The extremely slow movements of these plates cause them to grind into one another at convergent plate boundaries, move apart from one another at divergent plate boundaries, and slide past one another at transform plate boundaries. QUESTION: What plate are you floating on?
ANTARCTIC PLATE
Divergent plate boundaries
Convergent plate boundaries
Transform faults
Fig. 15-4a, p. 338

14. GEOLOGIC PROCESSES
The San Andreas Fault is an example of a transform fault.
Figure 15-5

16. GEOLOGIC PROCESSES
External processes result directly or indirectly from solar energy and on gravity.
Wind, rain, weathering, erosion
Tend to wear the earth’s surface down and produce a variety of landforms formed by eroded topsoil, sand, and sediment.
Hoodoos at Bryce Canyon, UT

17. GEOLOGIC PROCESSES
“Hoodoos at Sunrise” Bryce Canyon, UT

18. GEOLOGIC PROCESSES
Internal processes tend to build up the earth’s surface
Cleveland Volcano
Chuginadak Island, Alaska
Figure 15-5

19. Internal processes tend to build up the earth’s surface
Sarychev Volcano
Kuril Island, Japan (Between Japan & Russia)

20. Internal processes tend to build up the earth’s surface
Sarychev Volcano
View from the International Space Station

21. GEOLOGIC PROCESSES
Internal processes tend to build up the earth’s surface

22. Wearing Down and Building Up the Earth’s Surface
Weathering is an external process that wears the earth’s surface down.
Next

23. Parent material (rock)
Biological weathering (tree roots and lichens)
Chemical weathering (water, acids, and gases)
Physical weathering (wind, rain, thermal expansion and contraction,
“frost wedging”:
water freezing and
expanding)
Figure 15.6
Natural capital: physical, chemical, and biological processes can weather or convert rock into smaller fragments and particles. It is the first step in soil formation.
Particles of parent material
Fig. 15-6, p. 340

24. MINERALS, ROCKS, AND THE ROCK CYCLE
The earth’s crust consists of solid inorganic elements and compounds called minerals that can sometimes be used as resources.
Mineral resource: a concentration of naturally occurring material in or on the earth’s crust that can be extracted and processed into useful materials at an affordable cost.

25. Decreasing cost of extraction
Undiscovered
Identified
Economical
Reserves
Other resources
Decreasing cost of extraction
Not economical
Figure 15.7
Natural capital: general classification of nonrenewable mineral resources. (The area shown for each class does not represent its relative abundance.) Hypothetically, other resources could become reserves because of rising mineral prices or improved mineral location and extraction technology. In practice, geologists expect only a fraction of these resources to become reserves. QUESTION: How might this classification scheme change if a full-blown nanotechnology revolution (p. 335) takes place over the next two decades?
Decreasing certainty
Known
Existence
Fig. 15-7, p. 341

26. General Classification of Nonrenewable Mineral Resources
The U.S. Geological Survey classifies mineral resources into four major categories:
Identified: known location, quantity, and quality or existence known based on direct evidence and measurements.
Undiscovered: potential supplies that are assumed to exist based on indirect evidence.
Reserves: identified resources that can be extracted profitably.
Other: undiscovered or identified resources not classified as reserves

27. General Classification of Nonrenewable Mineral Resources
3 Major Categories
fossil fuels (coal, oil, natural gas)
metallic minerals (copper, iron, platinum, etc.)
nonmetallic minerals (sand, gravel, limestone).
Figure 15-7

28. GEOLOGIC PROCESSES
Deposits of nonrenewable mineral resources in the earth’s crust vary in their abundance and distribution.
5 nations supply most of the world’s nonrenewable mineral resources
USA, Canada, Russia, South Africa, Australia
3 nations (8% of world pop.) use 75% of metals
USA, Germany, Russia

29. Mineral Resources USA:
Imports 50% or more of 24 of its 42 most important nonrenewable mineral resources
The “strategic four”:
Chromium, Cobalt, Manganese, Platinum
Essential for economy & military “…no cars, airplanes, jet engines, satellites, sophisticated weapons, or household appliances without these 4”
US has virtually no reserves
Depend on politically unstable sources in former Soviet Republics and in Africa (South Africa, Zambia, Zimbabwe, Republic of Congo)
US has a 3 year strategic reserve

30. GEOLOGIC PROCESSES
A very slow chemical cycle recycles three types of rock found in the earth’s crust:
Sedimentary rock (sandstone, limestone).
Form from sediments
Igneous rock (granite, pumice, basalt, obsidian).
Form from magma or lava
Metamorphic rock (slate, marble, quartzite).
Form from other rocks that change under extreme temperature and pressure

31. GEOLOGIC PROCESSES
Sedimentary rock sandstone

32. GEOLOGIC PROCESSES Sedimentary rock limestone (from CaCO3 shells)
Most Caves
Road Base

33. Geologic Processes
Igneous rock: granite

34. Geologic Processes
Igneous rock: pumice
(fast cool)

35. Geologic Processes
Igneous rock: basalt
(fast to medium-time cool)

36. Geologic Processes
Igneous rock: obsidian
(slow cool)

37. GEOLOGIC PROCESSES
Metamorphic rock: slate

38. GEOLOGIC PROCESSES
Metamorphic rock: marble

39. GEOLOGIC PROCESSES
Metamorphic rock: quartzite

40. Erosion Transportation Heat, pressure, stress Magma (molten rock)
Weathering
Deposition
Igneous rock Granite, pumice, basalt,
obsidian
Sedimentary rock Sandstone, limestone,
mudstone
Heat, pressure
Cooling
Heat, pressure, stress
Magma (molten rock)
Figure 15.8
Natural capital: the rock cycle is the slowest of the earth’s cyclic processes. The earth’s materials are recycled over millions of years by three processes: melting, erosion, and metamorphism, which produce igneous, sedimentary, and metamorphic rocks. Rock from any of these classes can be converted to rock of either of the other two classes, or can be recycled within its own class. QUESTION: List three ways that the rock cycle benefits your lifestyle.
Melting
Metamorphic rock Slate, marble, gneiss, quartzite, some “granite”
Fig. 15-8, p. 343

41. ENVIRONMENTAL EFFECTS
The extraction, processing, and use of mineral resources has a large environmental impact.
MOST global & U.S. solid waste comes from extraction & processing of mineral resources
Figure 15-9

42. What is required for metal to be recycled?
Surface mining
Metal ore
Separation of ore from gangue
Smelting
Melting metal
Conversion to product
Discarding of product (scattered in environment)
Recycling
What happens to matter quality if metal is scattered in the environment?
Figure 15.9
Natural capital degradation: life cycle of a metal resource. Each step in this process uses large amounts of energy and produces air and water pollution and huge amounts of crushed rock and other forms of solid waste. The lower the grade of ore, the greater these environmental impacts.
What is required for metal to be recycled?
Good news: Metal is infinitely recyclable, as long as there is enough energy.

43. Steps Environmental effects Natural Capital Degradation Mining
Extracting, Processing, and Using Nonrenewable Mineral and Energy Resources
Steps
Environmental effects
Disturbed land; mining accidents; health hazards, mine waste dumping, oil spills and blowouts; noise; ugliness; heat
Mining
Exploration, extraction
Processing
Transportation, purification, manufacturing
Solid wastes; radioactive material; air, water, and soil pollution; noise; safety and health hazards; ugliness; heat
Use
Figure 15.10
Natural capital degradation: some harmful environmental effects of extracting, processing, and using nonrenewable mineral and energy resources. The energy required to carry out each step causes additional pollution and environmental degradation.
Transportation or transmission to individual user, eventual use, and discarding
Noise; ugliness; thermal water pollution; pollution of air, water, and soil; solid and radioactive wastes; safety and health hazards; heat
Fig , p. 344

44. ENVIRONMENTAL EFFECTS OF USING MINERAL RESOURCES
Minerals are removed through a variety of methods that vary widely in their costs, safety factors, and levels of environmental harm.
A variety of methods are used based on mineral depth.
Surface mining: shallow deposits are removed.
Subsurface mining: deep deposits are removed.

45. Open-pit Mining
Machines dig holes and remove ores, sand, gravel, and stone.
Toxic groundwater can accumulate at the bottom.
Copper Mine, Bingham, UT World’s largest man-made hole mi deep, 2.5 mi wide at top
Next

46. Figure 15-11

47. Contour Strip Mining Used on hilly or mountainous terrain.
Unless the land is restored, a wall of dirt is left in front of a highly erodible bank called a highwall.
Next

48. Undisturbed land Overburden Highwall Coal seam Overburden Pit Bench
Figure 15.13
Natural capital degradation: contour strip mining of coal used in hilly or mountainous terrain.
Spoil banks
Fig , p. 346

49. Area Strip Mining
Earth movers strips away overburden, and giant shovels removes mineral deposit.
Often leaves highly erodible hills of rubble called spoil banks.
Figure 15-12

50. Mountaintop Removal
Machinery removes the tops of mountains to expose coal.
The resulting waste rock and dirt (“tailings”) are dumped into the streams and valleys below.
Next

51. Mountaintop Removal
Figure 15-14

52. Mining Impacts
Metal ores are smelted at high temperatures or treated with (potentially toxic) chemicals to extract the desired metal.
Cyanide heap leaching of gold
Figure 15-15

53. SUPPLIES OF MINERAL RESOURCES
The future supply of a resource depends on its affordable supply and how rapidly that supply is used.
A rising price for a scarce mineral resource can increase supplies and encourage more efficient use.
....(stock and flows?)

54. SUPPLIES OF MINERAL RESOURCES
Depletion curves for a renewable resource using three sets of assumptions.
Dashed vertical lines represent times when 80% depletion occurs.
Figure 15-16

55. Depletion time A Depletion time B Depletion time C
Mine, use, throw away; no new discoveries; rising prices
Recycle; increase reserves by improved mining technology, higher prices, and new discoveries B
Production
Recycle, reuse, reduce consumption; increase reserves by improved mining technology, higher prices, and new discoveries C
Figure 15.16
Natural capital depletion: depletion curves for a nonrenewable resource (such as aluminum or copper) using three sets of assumptions. Dashed vertical lines represent times when 80% depletion occurs.
Present
Depletion time A
Depletion time B
Depletion time C
Time
Fig , p. 348

56. SUPPLIES OF MINERAL RESOURCES
New technologies can increase the mining of low-grade ores at affordable prices, but harmful environmental effects can limit this approach.
1900- Average US copper ore was 5% Cu
“ “ “ “ is 0.5 % Cu, and the price of copper is lower.

57. SUPPLIES OF MINERAL RESOURCES
Most minerals in seawater and on the deep ocean floor cost too much to extract, and there are squabbles over who owns them.
“Manganese Nodules” cover 25-50% of the Pacific Ocean floor.
High costs of extraction: 4-6 km deep
Squabbles over who owns them in international waters

58. “Manganese Nodules” a.k.a. Polymetallic Nodules

59. “Manganese Nodules” a.k.a. Polymetallic Nodules
Vary in size from tiny particles to large pellets more than 20 centimeters across.
Most nodules are between 5 and 10 cm in diameter, about the size of potatoes.
Those of greatest economic interest contain manganese (27-30 %), nickel (  %), copper (1-1.4 %) and cobalt (  %). Other constituents include iron (6 %), silicon (5%) and aluminium (3%), with lesser amounts of calcium, sodium, magnesium, potassium, titanium and barium, along with hydrogen and oxygen.

60. Getting More Minerals from the Ocean
Hydrothermal deposits form when mineral-rich superheated water shoots out of vents in solidified magma on the ocean floor.
Figure 15-17

61. USING MINERAL RESOURCES MORE SUSTAINABLY
Scientists and engineers are developing new types of materials as substitutes for many metals (see nanotechnology p.335 & S-33)
Recycling valuable and scarce metals saves money and has a lower environmental impact then mining and extracting them from their ores.

62. Sustainable Use of Nonrenewable Minerals
Solutions
Sustainable Use of Nonrenewable Minerals
• Do not waste mineral resources.
• Recycle and reuse 60–80% of mineral resources.
• Include the harmful environmental costs of mining and processing minerals in the prices of items (full-cost pricing).
• Reduce subsidies for mining mineral resources.
• Increase subsidies for recycling, reuse, and finding less environmentally harmful substitutes.
• Redesign manufacturing processes to use less mineral resources and to produce less pollution and waste.
Figure 15.18
Solutions: ways to achieve more sustainable use of nonrenewable mineral resources. QUESTION: Which two of the solutions do you think are the most important?
• Have the mineral-based wastes of one manufacturing process become the raw materials for other processes.
• Sell services instead of things. e.g. carpet rentals
• Slow population growth.
Fig , p. 351

63. Mining & the US Government
The US Hardrock Mining Act was passed in 1872.
How relevant do you think it is today?
Case in point: In 2004, Phelps-Dodge bought public land in Colorado worth $155,000,000 for $875.
This is a good example of how governments subsidize mining and other resource extraction industries such as fishing fleets and logging companies.

64. Case Study: The Ecoindustrial Revolution
Growing signs point to an ecoindustrial revolution taking place over the next 50 years.
Biomimicry-The goal is to redesign industrial manufacturing processes to mimic how nature deals with wastes .
Industries can interact in complex resource exchange webs in which wastes from manufacturer become raw materials for another.

65. The Ecoindustrial Revolution
M (makes 60,000 products in100 manufacturing plants) began “3P” program
Pollution Prevention Pays
Redesigned equipment &processes
Fewer hazardous raw materials
Identified hazardous wastes and recycled or sold them as raw materials to other companies
Began making more nonpolluting products
By 2005: sharply reduced waste production & air pollution, and saved almost $1 billion.
Since 1990, DuPont, BP, IBM, and a growing number of others have saved millions of dollars with similar measures.

66. Sulfuric acid producer
Industrial Ecosystem: Kalundborg, Denmark
Sludge
Pharmaceutical plant
Local farmers
Sludge
Greenhouses
Waste heat
Waste heat
Waste heat
Fish farming
Waste heat
Electric power plant
Surplus natural gas
Fly ash
Oil refinery
Surplus sulfur
Waste calcium sulfate
Figure 15.19
Solutions: the industrial ecosystem in Kalundborg, Denmark, reduces waste production by mimicking a natural food web. The wastes of one business become the raw materials for another. QUESTION: Is there an industrial ecosystem near where you live or go to school? If not, why not?
Waste heat
Cement manufacturer
Surplus natural gas
Sulfuric acid producer
Wallboard factory
Area homes