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.
Showing upper level of an underground surface in which soil or rock is permanently saturated with water.
The water table separates the underground water zone from the capillary fringe or zone of aeration.
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.
For investigation of geographical and geological features.
Eight landform models join to form a continuous model showing the mountains, lakes, rivers, deserts, glaciers, coastlines, cayons and cultural point, with lesson plan, size 90 x 90 cm.
Relief map of North Atlantic Ocean showing typical portion of ocean floor.
It is easy to identify all the major ocean features, complete with lesson plan, size 45 x 60 cm.
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