GEOG 101 Lecture Notes - Lecture 22: Migori, Alluvium, Dredging
Document Summary
Method employed when the mineral bearing rock doesn"t out crop. Vertical shafts are sunk into the earth"s crust to reach the layer with the mineral. Horizontal tunnels are dug from the vertical shaft to reach the mineral. Props are erected to support the roof to prevent it from collapsing. The mineral bearing rock is blasted loose by explosives. The deposit is transported on light rail or conveyor belt to the bottom of the shaft. It is then brought to the surface in a crane or a lift called cage. Method employed when the mineral deposit can be reached from the valley sides. Horizontal tunnels (adits) are constructed from the side of the hill. Railway line is constructed into the mine to bring out the mineral e. g. mining of copper at: drift/adit mining. Method used in mining soluble minerals such as sulphur, salt, potash, etc. Superheated water is ejected into salt deposits. The solution is then pumped into the surface: drilling.
