(economics) manufacturing or mining or growing something (usually in large quantities) for sale

remove the inner part or the core of

mining valuable minerals from a placer by washing or dredging

the mining of ore or coal from an open mine

The manufacture of salt.

(of mines and mining) worked from the exposed surface

a hole or passage made by a drill; usually made for exploratory purposes

a horizontal (or nearly horizontal) passageway in a mine

(mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore

break into lumps before sorting