Presentation on theme: "How Will We Manage Our Nonrenewable Mineral Resources in the Future?"— Presentation transcript:
1 How Will We Manage Our Nonrenewable Mineral Resources in the Future?
2 How Do We Find Mineral Resources? Aerial PhotosMeasuring radiationMagnetometer (Iron)Core SamplesSeismic Surveys (set off a bomb and see how seismic waves move in the ground)Chemical analysis of water and plants
3 How Are Buried Mineral Deposits Removed? Surface Mining (shallow deposits)Open-Pit Mining: Machines dig holes and remove oresDredging: Chain buckets and draglines scrape up underwater mineral depositsArea Strip Mining: A giant earth mover strips land creating a trench which is then filled in with the overburden creating a wavy series of highly erodible hills of rubble called spoil banks.Contour Strip Mining: Used on hilly or mountainous terrains. Power shovel cuts a series of terrains, overburden from the terrace above is dumped below
4 Open Pit MiningArea Strip MiningContour Strip MiningDredging
5 Mountaintop Removal: Uses explosives, massive shovels and huge machinery called draglines Subsurface Mining: (Deep minerals) Miners dig a deep vertical shaft, blast tunnels and chambers and remove minerals using machineryDisturbs less than 1/10 as much landLeaves much of the resources in the groundHazards include cave-ins, explosions, lung disease
7 Some Definitions Spoil: Rock and soil removed during surface mining Gangue: Waste or undesired material in an oreTailings: Waste material removed as impurities when waste mineral material is separated from the metal in an oreSmelting: Melting of ore to refine it
9 How Do We Conserve Our Mineral Resources? RecycleMinimize WasteFind Substitute Materials (Nanotechnology)Do Without
10 Can We Use Nanotechnology to Create New Materials? Uses atoms & molecules to create substances (stain resistant and wrinkle free materials for pants, sunscreens that block UV light)Designer molecules that seek out and kill cancer cellsNanoparticles that provide super thermal insulationBathrooms that never need cleaning, and so on
11 What’s the Catch?Smaller molecules become more reactive and potentially more toxicNanosize particles can get through the natural defenses of our bodyLittle is known about how nanoparticles behave in our body
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