The Earthand Its Mineral  Resources                  www.company.com
Introduction               • When the Earth first form                 scientists believe it was a                 mass of...
Introduction               • Gradually, the surface of                 the Earth cooled and                 formed a thick...
This chapter examines:• Minerals extracted from the Earth’s  crust• Impacts of this activity• Ways to meet demand for mine...
The Earth’s Mineral Riches                              Metal-                             yielding               Nonfuel ...
The Earth’s Mineral Riches• Metal-yielding minerals (aluminum and copper  ore) must be processed• Industrial (lime) and co...
1. The Earth’s Mineral Riches • Geologists divide rocks into three major classes  Igneous       •Formed when molten minera...
The Earth’s Mineral Riches• Most metal-yield minerals come from igneous  rocks• A concentrated deposit of minerals that ca...
Mineral Resources and Society            • Minerals are extremely              important to our lives            • Scholar...
Mineral Resources and Society              • Minerals are vital to                national economies              • More t...
Who Consumes the Worlds Minerals?• The more developed countries are the major  consumers of the minerals• 20% of the world...
www.company.com
Import Reliance• World mineral production is widely  dispersed• Some minerals are found in commercially  valuable quantiti...
Will There Be Enough?• 75% of the economically vital minerals are  abundant enough• Approximately 18 economically essentia...
2. Environmental Impacts of Mineral Exploitation• Minerals are part of a production-consumption  system:•   Exploration   ...
Environmental Impacts of Mineral Exploitation               • Each stage in this system produces                 major env...
Environmental Impacts of Mineral Exploitation                •   Sulfur present in tailings may combine                   ...
Environmental Impacts of Mineral Exploitation• Around the Sudbury smelter in Canada, 10 400 hectares have been  turned int...
3. Creating a Sustainable System of MineralProduction• Putting into practice the operating principles of  sustainability ,...
Creating a Sustainable System of Mineral    Production• Recycling is a process in which valuable products such  as metals ...
Creating a Sustainable System of Mineral              Production•   The SEI Group collects used electric wires/cables, opt...
Creating a Sustainable System of Mineral    Production• Conservation – decreasing product size, increasing  product durabi...
Creating a Sustainable System of MineralProduction            • Conservation and recycling              measures combined:...
Creating a Sustainable System of MineralProduction• Restoration and Environmental Protection• New laws and tighter enforce...
Expanding Reserves• Future demand cannot all be satisfied by conservation efforts.• New deposits need to be discovered and...
Expanding Reserves• Rising supplies   •   Reduce supplies• Prices            •   High labor costs• Technological     •   I...
Expanding Reserves              • Technological                improvements make it                feasible to mine less  ...
Minerals From The Sea          • The minerals deposits on land            are finite, they have been heavily            ex...
Minerals From The Sea• Pros                    • Cons• Vast resource of        • Many of resources are  minerals          ...
Minerals From The Sea             • Manganese               nodules contain:             • Several vital               min...
Finding Substitutes• Historically, the substitution of one resource for  another one that has been depleted has been a  us...
Personal Actions         • Personal actions are           essential to building a           sustainable future         • B...
Hazardous and SolidWastes : Sustainable     Solution   (chapter 23)         Prof. Sanga-Ngoie K.Done by Bekenova G. (ID № ...
Introduction• This chapter discusses solid and hazardous  wastes• It shows how individuals, business and  governments have...
1. Hazardous wastes:Coming to Terms with the Problem             • Hazardous wastes are waste               products of ho...
The Dimensions of the Problem• Each year countries worldwide produce millions  of tons of hazardous waste• This waste ende...
The Dimensions of the Problem• Effects of improper waste disposalGround water                     Habitats        Human   ...
Managing Hazardous Wastes        • Two problems:        • How to clean up existing wastes          sites?          Require...
The Superfund Act: Cleaning Up Past Mistakes• CERLA – Comprehensive Environmental  Response, Compensation and Liability Ac...
What to Do With Today’s Waste: Preventing Future   Problems• The more sustainable approach involve steps that  reduce or e...
What to Do With Today’s Waste: Preventing FutureProblems• In-plant options include:• 1. Process manipulation – alterations...
What to Do With Today’s Waste: Preventing FutureProblems        • 2. Reuse and recycling strategies        • Companies can...
What to Do With Today’s Waste: Preventing Future  Problems• Conversation to Less Hazardous of  Nonhazardous Substances• No...
What to Do With Today’s Waste: Preventing FutureProblems• Detoxification can be accomplished for certain  types of waste b...
What to Do With Today’s Waste: Preventing FutureProblems      • Another option available for organic        wastes is inci...
A conceptual diagram of the Incineration                                           www.company.com
What to Do With Today’s Waste: Preventing FutureProblems• Low-temperature decomposition• Wastes are mix with air and maint...
What to Do With Today’s Waste: Preventing FutureProblems• Perpetual storage• 25 to 40% of the waste stream will remain eve...
Disposing of Radioactive Wastes        •   High-level of radioactive wastes are the most            hazardous of all waste...
Some Obstacles to Sustainable Hazardous-WasteManagement         • One of the main problems was that           much of it w...
Solid Wastes: Understanding the Problem• Each year, human society produces mountains  of municipal solid wastes• The probl...
Solid Wastes: Understanding the Problem• Municipal solid waste is the product of many  interacting factors                ...
Solving a Problem Sustainably• Output approach - incinerating trash or dumping  it in landfills• Input approach – reduce t...
The traditional strategy• The output approach• The most widely used• Open dump has been replaced by sanitary landfill• Lan...
Sustainable Options• The input approach• Source reduction include:• - increase product life span (high quality, more  dura...
Sustainable Options• The throughput approach: reuse, recycling,  composting• Recycling refers to the return of materials t...
Sustainable Options• Reuse is the return of operable and repairable goods  into the market system for someone to use• Reus...
Sustainable Options• Composting - the process in which nutrients from  organic wastes return to the soil• Form of nutrient...
The economic benefits• Taking together, source reduction, reuse, and  recycling can not only cut waste but also foster  mo...
Upcoming SlideShare
Loading in …5
×

The Earth and geological resourses

1,060 views

Published on

Published in: Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
1,060
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
37
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

The Earth and geological resourses

  1. 1. The Earthand Its Mineral Resources www.company.com
  2. 2. Introduction • When the Earth first form scientists believe it was a mass of rock and ice • Over time, solar radiation and other sources of heat caused the earth to melt • Gradually, the surface cooled and formed a thick, rocky crust rich in minerals www.company.com
  3. 3. Introduction • Gradually, the surface of the Earth cooled and formed a thick, rocky crust rich in minerals www.company.com
  4. 4. This chapter examines:• Minerals extracted from the Earth’s crust• Impacts of this activity• Ways to meet demand for minerals more sustainably www.company.com
  5. 5. The Earth’s Mineral Riches Metal- yielding Nonfuel IndustrialMinerals Construction Fuel www.company.com
  6. 6. The Earth’s Mineral Riches• Metal-yielding minerals (aluminum and copper ore) must be processed• Industrial (lime) and construction (gravel, send) are used directly• Minerals typically occur in rocks, solid aggregates that usually contain two or more different types of mineral www.company.com
  7. 7. 1. The Earth’s Mineral Riches • Geologists divide rocks into three major classes Igneous •Formed when molten minerals cool rocks (basalt and granite)Sedimentary • Formed from particles eroded from other types of rock rocks • ( shale and sandstone)Metamorphic • Formed when igneous or sedimentary rocks are transformed by heat and pressure rocks • (schist) www.company.com
  8. 8. The Earth’s Mineral Riches• Most metal-yield minerals come from igneous rocks• A concentrated deposit of minerals that can be mined and refined economically is called an ore. www.company.com
  9. 9. Mineral Resources and Society • Minerals are extremely important to our lives • Scholars delineate the ages of human history by the chief minerals in use at the time: • Stone • Bronze • Iron www.company.com
  10. 10. Mineral Resources and Society • Minerals are vital to national economies • More than a hundred nonfuel minerals are traded in the world market These materials worth a billions of dollars to the world economy www.company.com
  11. 11. Who Consumes the Worlds Minerals?• The more developed countries are the major consumers of the minerals• 20% of the world population consume about 75% of its mineral resources• Mineral consumption by the industrial nations has leveled off• World’s mineral consumption of less developed countries is on the rise www.company.com
  12. 12. www.company.com
  13. 13. Import Reliance• World mineral production is widely dispersed• Some minerals are found in commercially valuable quantities only in specific countries• Most nations are highly depended on the supplies of others www.company.com
  14. 14. Will There Be Enough?• 75% of the economically vital minerals are abundant enough• Approximately 18 economically essential minerals will fall in to short supply – some within a decade or two• Gold, silver, mercury, lead, sulfur, tin, tungsten, zinc are among them www.company.com
  15. 15. 2. Environmental Impacts of Mineral Exploitation• Minerals are part of a production-consumption system:• Exploration Mining Processing Transportation End use www.company.com
  16. 16. Environmental Impacts of Mineral Exploitation • Each stage in this system produces major environmental impacts , even in the best regulated countries • Mining and smelting have created enormous amount of environmental damage • Rock wastes burying vegetated areas, erode into lakes and streams • Toxic metals can contaminate nearby reservoirs, killing aquatic life www.company.com
  17. 17. Environmental Impacts of Mineral Exploitation • Sulfur present in tailings may combine with water to form sulfuric acid, creating acid mine drainage • Globally, copper and other nonferrous smelters produce about 8% of the world’s sulfur dioxide emissions • Toxic metals and acids from smelters are responsible for huge dead zones – places where all vegetation has perished • Mineral exploitation is responsible for deforestation, soil erosion, water and air pollution www.company.com
  18. 18. Environmental Impacts of Mineral Exploitation• Around the Sudbury smelter in Canada, 10 400 hectares have been turned into a barren moonscape www.company.com
  19. 19. 3. Creating a Sustainable System of MineralProduction• Putting into practice the operating principles of sustainability , especially : Conservation Recycling Restoration www.company.com
  20. 20. Creating a Sustainable System of Mineral Production• Recycling is a process in which valuable products such as metals are collected and returned to factories, where they are melted down and used to manufacture new products• Recycling :- Increases the time a metal remains in use- Helps to stretch limited mineral supplies- Reduces energy demand and water use- Slashes pollution www.company.com
  21. 21. Creating a Sustainable System of Mineral Production• The SEI Group collects used electric wires/cables, optical fiber cables and carbide chips for cutting tools and their plastic cases for recycling as materials for new products. www.company.com
  22. 22. Creating a Sustainable System of Mineral Production• Conservation – decreasing product size, increasing product durability• Conservation – using only what we need and using it efficiently• Cheapest, easiest, and quickest means of stretching mineral resources:• - making smaller automobiles• - finding ways to design products using less material• www.company.com
  23. 23. Creating a Sustainable System of MineralProduction • Conservation and recycling measures combined: • - will slow down depletion, giving us more time to develop new mining technologies and fined substitutes • - minimize our impact on environment www.company.com
  24. 24. Creating a Sustainable System of MineralProduction• Restoration and Environmental Protection• New laws and tighter enforcement of existing laws could improve mining practices and reduce pollution from smelters• Requirement to prepare an EIA• Cooperation in cleaning up abandoned mines www.company.com
  25. 25. Expanding Reserves• Future demand cannot all be satisfied by conservation efforts.• New deposits need to be discovered and mined• Reserves – deposits which is fairly certain exist and feasible to mine at current prices• Price is one of the most important factors determine the size of mineral reserves• Rising prices – economically feasible to search for and produce more minerals – expend of mineral reserves• But mineral resources are finite. Resources will simply run out or become so costly to mine that they will be unaffordable www.company.com
  26. 26. Expanding Reserves• Rising supplies • Reduce supplies• Prices • High labor costs• Technological • Interest rates improvements • Energy costs • Env. protection costs www.company.com
  27. 27. Expanding Reserves • Technological improvements make it feasible to mine less concentrated ores, which helps expend reserves www.company.com
  28. 28. Minerals From The Sea • The minerals deposits on land are finite, they have been heavily exploited • Antarctica and the floor of the world’s oceans are potential sources for new minerals • Superficially promising, these options face serious economic, environmental, and social barriers www.company.com
  29. 29. Minerals From The Sea• Pros • Cons• Vast resource of • Many of resources are minerals dissolved, generally in• Important minerals on low concentration the sea floor • Issue of ownership• Mineral –rich nodules • Environmental impact “manganese nodules” www.company.com
  30. 30. Minerals From The Sea • Manganese nodules contain: • Several vital minerals • Manganese 24% • Iron 14% • Copper 1% • Cobalt 0,25% www.company.com
  31. 31. Finding Substitutes• Historically, the substitution of one resource for another one that has been depleted has been a useful strategy for industrialized nations• Substitution could help find alternatives to some minerals, replace environmentally damaging materials• Critics argue that it creates unreasonable faith among the public• Many substitutes have limits themselves www.company.com
  32. 32. Personal Actions • Personal actions are essential to building a sustainable future • Buying durable products, recycling, and choosing recycled materials are three steps people can take www.company.com
  33. 33. Hazardous and SolidWastes : Sustainable Solution (chapter 23) Prof. Sanga-Ngoie K.Done by Bekenova G. (ID № 51211620) www.company.com
  34. 34. Introduction• This chapter discusses solid and hazardous wastes• It shows how individuals, business and governments have addressed the problem• Chapter shows more sustainable approaches, measures that make sense from social, economic, and environmental perspectives www.company.com
  35. 35. 1. Hazardous wastes:Coming to Terms with the Problem • Hazardous wastes are waste products of homes, factories, businesses, military installations, and other facilities that pose a thread to people and the environment • Toxic, carcinogenic, or mutagenic • The signs of unsustainable practices www.company.com
  36. 36. The Dimensions of the Problem• Each year countries worldwide produce millions of tons of hazardous waste• This waste ended up in abandoned warehouses; in rivers, streams, and lakes; in fields and forests, and along high ways• No current estimates are available www.company.com
  37. 37. The Dimensions of the Problem• Effects of improper waste disposalGround water Habitats Human Well closurescontamination destruction disease Sewage Soil Livestock Fish kills treatmentcontamination disease plant damage Difficult or Town closures impossible cleanups www.company.com
  38. 38. Managing Hazardous Wastes • Two problems: • How to clean up existing wastes sites? Required immediate actions • How to deal with enormous amounts of hazardous waste produced each year? Required long-term preventive measures that eliminate the production of wastes www.company.com
  39. 39. The Superfund Act: Cleaning Up Past Mistakes• CERLA – Comprehensive Environmental Response, Compensation and Liability Act (Superfund)• Established in 1980, $16.3 billion fund financed by state and federal governments, and by taxes on chemical and oil companies• To clean up leaking underground storage tanks, hazardous wastes dumps, landfills, contaminated factories, mined and mils www.company.com
  40. 40. What to Do With Today’s Waste: Preventing Future Problems• The more sustainable approach involve steps that reduce or eliminate hazardous waste output YOU DON’T HAVE WASTE IF YOU DON’T MAKE IT www.company.com
  41. 41. What to Do With Today’s Waste: Preventing FutureProblems• In-plant options include:• 1. Process manipulation – alterations in manufacturing process to cut waste production a) substitution - the use of nontoxic of less toxic substitutes in manufacturing b) monitoring of manufacturing processes to locate and fix leaks www.company.com
  42. 42. What to Do With Today’s Waste: Preventing FutureProblems • 2. Reuse and recycling strategies • Companies can capture toxic waste and, with little or no purification, reuse them to manufacture other products or sell them to other companies fore reuse • Waste output can be dramatically reduced www.company.com
  43. 43. What to Do With Today’s Waste: Preventing Future Problems• Conversation to Less Hazardous of Nonhazardous Substances• Not all waste can be eliminated, reused, and recycled• Remaining waste be destroyed or detoxified www.company.com
  44. 44. What to Do With Today’s Waste: Preventing FutureProblems• Detoxification can be accomplished for certain types of waste by land disposal, applying them to land• Land treatment is an expansive option, requiring care to avoid polluting ecosystem, poisoning cattle and other animals, and contaminating groundwater www.company.com
  45. 45. What to Do With Today’s Waste: Preventing FutureProblems • Another option available for organic wastes is incineration • High-temperature furnaces at stationary wastes disposal site, on ships that burn waste at sea, and on mobile incinerators • Disadvantages: release of toxicants during transport, possibility of long-term exposure, producing carbon dioxide www.company.com
  46. 46. A conceptual diagram of the Incineration www.company.com
  47. 47. What to Do With Today’s Waste: Preventing FutureProblems• Low-temperature decomposition• Wastes are mix with air and maintained under high pressure while being heated to 450 C to 600 C• Organic compounds are broken into smaller, biodegradable molecules• Advantage – uses less energy www.company.com
  48. 48. What to Do With Today’s Waste: Preventing FutureProblems• Perpetual storage• 25 to 40% of the waste stream will remain even after a best efforts• Residual waste could be dumped in secured landfills, excavated pits lined by impermeable synthetic liners• To lower the risk of leakage, landfills should be placed in arid regions• One of the cheapest option• Growing public opposition, problems for future generation www.company.com
  49. 49. Disposing of Radioactive Wastes • High-level of radioactive wastes are the most hazardous of all wastes • Generated by nuclear power plants, weapon production, research laboratories and hospitals • Deep underground disposal site • Radioactive waste can be bombarded with neutrons in special reactors to convert some of it into less harmful substances • Seabed disposal has been used, but now is forbidden (effects are difficult to predict) www.company.com
  50. 50. Some Obstacles to Sustainable Hazardous-WasteManagement • One of the main problems was that much of it was highly diluted in water released by industrial processes • Removing the hazardous substance from the water is extremely costly • 11% of total release - underground injection • 60% - release occurs in the air www.company.com
  51. 51. Solid Wastes: Understanding the Problem• Each year, human society produces mountains of municipal solid wastes• The problem are especially acute in the more developed nations• In 2003, Americans generated 212 million tons of municipal solid waste• www.company.com
  52. 52. Solid Wastes: Understanding the Problem• Municipal solid waste is the product of many interacting factors Low product Large population High consumption durability Heavy A lack of personal dependence on Low reuse and and governmental disposable recycling rates commitment to products reduce waste Relatively cheap energy and abundant land for disposal www.company.com
  53. 53. Solving a Problem Sustainably• Output approach - incinerating trash or dumping it in landfills• Input approach – reduce the amount of materials entering the production-consumption cycles• Throughput approach – direct materials back into production-consumption cycle, creating cyclic system www.company.com
  54. 54. The traditional strategy• The output approach• The most widely used• Open dump has been replaced by sanitary landfill• Landfill require land and grate deal of energy for excavation , filling and hauling trash• They can pollute ground water• Low social acceptability• Locating them away from ground water supplies, collecting and treating toxic leachate, capturing methane gas www.company.com
  55. 55. Sustainable Options• The input approach• Source reduction include:• - increase product life span (high quality, more durable goods)• - reduce the amount of materials in goods and packaging (make products smaller and compact)• - reduce consumption (buy what you need) www.company.com
  56. 56. Sustainable Options• The throughput approach: reuse, recycling, composting• Recycling refers to the return of materials to manufacturers• Recycling conserve recourses, reduce energy demand, cuts pollution, saves water, decreases solid waste disposal and incineration www.company.com
  57. 57. Sustainable Options• Reuse is the return of operable and repairable goods into the market system for someone to use• Reuse :• - reduces land area needed for solid waste disposal• - provides job• Provides inexpensive product for the poor• Reduce litter• Decreased the amount of consumed materials• Help reduce pollution and environmental degradation www.company.com
  58. 58. Sustainable Options• Composting - the process in which nutrients from organic wastes return to the soil• Form of nutrient recycling• Organic matter is collected from various sources , stockpiled, mixed with some dirt , and then allowed to decompose• Compost - nutrient rich organic material that can be used as fertilizer• Reduce the need for landfilling, helps nourish soils, creating cycle system www.company.com
  59. 59. The economic benefits• Taking together, source reduction, reuse, and recycling can not only cut waste but also foster more flexible and self-reliant economies. Decentralized collection and processing of secondary materials can create new industries and jobs www.company.com

×