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13 cards from this deck
Extracting ores deep beneath Earth's surface
Vertical tunnel accessing underground ore deposits
Horizontal passages from main shaft to reach ore
Equipment with rotating cutting heads for extracting ore
Break away ore & rock with multiple cutting teeth
Use straight-down shafts with horizontal levels
Inclined access tunnels following the ore deposit
Horizontal tunnels driven directly into hillsides
Surface structures supporting lifting equipment
Horizontal working areas
Connecting tunnels between main passages
Rock falls and structural failures pose constant threats
Dangerous gases accumulating in enclosed spaces
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