what does open pit and deep shaft mines mean?

Question

copper mines

Answer 1

Open pit is just that-- a big open pit.
A deep shaft is a tunnel deep into the ground.

Answer 2

Open-pit mining, or opencast mining, refers to a method of extracting rock or minerals from the earth by their removal from an open pit or borrow. The term is used to differentiate this form of mining from extractive methods that require tunneling into the earth. Open-pit mines are used when deposits of commercially useful minerals or rock are found near the surface; that is, where the overburden (surface material covering the valuable deposit) is relatively thin or the material of interest is structurally unsuitable for tunneling (as would be the case for sand, cinder, and gravel). For minerals that occur deep below the surface—where the overburden is thick or the mineral occurs as veins in hard rock— underground mining methods are used to extract the valued material.

Answer 3

open pit mines, South Afican diamond mines that seek to glean everything there ontop of a kimberlite cone. a deep shaft mine followes the veins of material that which is being sought.

Answer 4

Open pit,dug from the top down,Deep shaft,drilled and dynamited to form a shaft.