Overall, it has been estimated that 1 tonne of onshore material costs the same as roughly the equivalent of 6 offshore tonnes. When compared with onshore quarrying activities extraction and emissions were less than 50% while transport costs were less than 15%. The dredged aggregates are an attractive alternative to land based sources such as quarries. A variety of material can be extracted from the seabed which include gold, tin (cassiterite), aluminium (bauxite), mineral sands (ilmenite, rutile, zircon), diamond deposits and rocks salts as well as more standard material such as sand and gravel for use as aggregates in the construction industry. Mineral Dredging involves the extraction of minerals that may have a substantial economic value from underwater deposits.
0 kommentar(er)
