Physical Geography and Occurrence (AQA A-Level Geography): Flashcards
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Why minerals must be unevenly distributed
Why minerals must be unevenly distributed
Creates concentrated deposits worth extracting profitably
4 main mineral deposit categories
4 main mineral deposit categories
Magmatic, hydrothermal, metamorphogenic, sedimentary
Magmatic deposits formation
Magmatic deposits formation
Crystallisation of magma forced into Earth's crust
Hydrothermal deposits formation
Hydrothermal deposits formation
Hot solutions through cracks; minerals precipitate when cooling
Metamorphogenic deposits formation
Metamorphogenic deposits formation
Heat & pressure transform existing deposits over time
Placer deposits
Placer deposits
Alluvial deposits; dense minerals settle from slowing water
20th century mining shift
20th century mining shift
Underground to open-pit (mechanisation enabled)
Overburden definition
Overburden definition
Rock & soil above mineral deposit
Stripping ratio
Stripping ratio
Waste rock removed vs ore extracted (e.g., 3:1)
Cut-off ore grade
Cut-off ore grade
Lowest ore purity economically viable to extract