10 Terms
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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
Air bridge
Mining; General mining
A bridge where a return airway passes over (overcast) or under (undercast) an intake airway. It is generally constructed with concrete blocks, structural steel, and/or sheet metal, and is made ...
Air crossing
Mining; General mining
A bridge where a return airway passes over (overcast) or under (undercast) an intake airway. It is generally constructed with concrete blocks, structural steel, and/or sheet metal, and is made ...
Spherical dam
Mining; General mining
A brick or concrete seal or stopping built into a roadway to close off an area against water. The convex surface is from the water side of the roadway. The construction is built well into the ground ...
N-truss
Mining; General mining
A bridge or roof truss that has parallel upper and lower chords and an arrangement of web members consisting of tension diagonals and compression verticals, with the vertical struts separating the ...
Flow breccia
Mining; General mining
A breccia that is formed contemporaneously with the movement of a lava flow; the cooling crust becomes fragmented while the flow is still in motion.
Earthy breccia
Mining; General mining
A breccia in which rubble, sand, and silt plus clay each constitute more than 10% of the rock.
Crush breccia
Mining; General mining
A breccia formed essentially in situ by cataclasis, esp. along a fault. Compare: tectonic breccia.
