Which of the following describes the practice of drift mining?
a digging a tunnel into...
Which of the following describes the practice of drift mining?
a digging a tunnel into the side of a mountain, often involving explosives
b considerable disruption of surface land
c the deepest form of underground mining, involving excavating a tunnel from the top to the bottom area of the mine
d removal of the surface layer of mineral deposits
Answers: 2
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