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13 cards from this deck
Extracting ores/minerals deep beneath Earth's surface
When valuable ores are too deep for surface mining
Vertical tunnel providing access to underground ore deposits
Horizontal passages from shaft to reach and extract ore
Less visual impact on landscape than open-pit mining
Machines with rotating cutting heads for underground extraction
Rotating cutting heads with multiple cutting teeth
Use straight-down shafts with horizontal levels
Inclined access tunnels following ore deposit
Horizontal tunnels driven directly into hillsides
Surface structures supporting lifting equipment
Rock falls and structural failures in underground mines
Dangerous gases accumulating in enclosed spaces underground
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