Bauxite is a mineral that contains varying amounts of combined water and several impurities of which ferric oxide and silica are usually predominant. It is found in a belt around the equator and is generally extracted by open-cast mining. Before mining can commence the land needs to be cleared of timber and vegetation.
Unlike the base metal ores bauxite does not require complex processing because most of the bauxite mined is of an acceptable grade. Ore quality can be improved by relatively simple and inexpensive processes for removing clay known as “beneficiation” which include washing wet screening and mechanical or manual sorting.
The bauxite residue sinks to the bottom of the settling tanks then is transferred to the washing tanks where it undergoes a series of washing stages to recover the caustic soda which is reused in the digestion process . Further separation of the pregnant liquor from the bauxite residue is performed utilising a series of security filters.
The island’s bauxite comparative advantage lies in the easy extraction of the metal ore as a result of … in tourism and the peak in bauxite mining … Queensland Bauxite The company’s focus centres on defining significant bauxite resources with a view to commencing direct shipping ore DSO bauxite mining and export operations in the …
During the strip-mining process bauxite is broken up and taken out of the mine to an alumina refinery. Once mining is complete the topsoil is replaced and the area undergoes a restoration process. When the ore is mined in forested areas an average of 80 percent of the land is returned to its native ecosystem.