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Published byMadlyn Sanders Modified over 9 years ago
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Economic Geology 9. Mines & Yours
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“If you can't grow it, it has to be mined”
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Our rocky economy
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Economic stones
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Aggregates UK - 200-250 million tonnes/yr Railway ballast, iron and steel, agriculture Road building (~50%) Concrete (~50%)
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Economic granite Very high compressive strength Dimension / armour stone Hard to carve Feldspar decomposes
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The only geological sport
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Economic dolerite Very strong Roadstone/aggregate
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Slating the economy Wales: 15,000 men employed in 1890s
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Economic sandstone Common, fairly strong Dimension / paving stone Weathers
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Economic limestone Dimension stone Cement Aggregate
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Dudley limestone
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Fossil-fuelled furnaces
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Yorkshire's Industrial Coast
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Ironstones
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Cleveland Ironstone Mines
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Why Are The Ironstones There?
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Fossilized Ropes?
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Fossil shrimp burrows!
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Shrimpy miners = human miners
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Sediment-hosted minerals Bronze Age copper mine Great Orme, Llandudno
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The origins of ores Magmatism – Fractionation / Immiscibility
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The origins of ores Hydrothermal processes: – Brines – Metamorphic fluids Metamorphic shearing Sedimentary placers
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Rare earths and renewables
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Rare earth elements Not that rare Soft, malleable, metallic Conductive, magnetic
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Shifting sources Global product
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Fossil fuels Oil and gas
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North Sea oil & gas
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UK energy balance (Figure from DECC report)
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Conventional / Unconventional
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Britain for shale? Carboniferous NW England Jurassic SE England
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The impact of power Vidal et al. - Nature Geoscience (2013)
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The trajectory of demand Vidal et al. - Nature Geoscience (2013)
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Next week: The Future Predictive Geology - Earthquakes - Tectonics - Climate + A Final Review
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