Rocks Collection,Set Of 20

Description

Shows coastal and mountain terrain in natural colour relief & cross section diagram of the substance of a typical volcano. Complete with lesson plan, size 60 x 45 cm

Description

Open pit mining often results in a large hole or pit being formed in the process of extracting a mineral. Deposits mined by open pit techniques are generally divided into horizontal layers called benches. The thickness of the benches depends on the type of deposit & the mineral being mined. Mining is generally conducted on a number of levels at any one time.

Description

Shows mining when any ore body lies at a considerable distance below the surface. The specific mining method selected depends upon the size, shape and orientation of the ore body and the depth involved.