Posts Tagged ‘Cyanide’
* Salting, drying and water shortages because of the enormous quantities of fresh water required for the extraction process
* Release and migration of heavy metals in the ecosystem
* Displacement of thousands of tons of ore causes sedimentation in rivers, vulnerability to wind and water erosion
* Environmental liabilities after the exploitation and destruction of the original ecosystem of the site
* Migration of highly toxic cyanide in groundwater and surface water and ecosystem
* Drainage acid, which is a major threat particularly in the extraction of sulfides.
Harmful effects of cyanide
Current technology for gold mining to separate uses cyanide gold from the non-valuable minerals. Cyanide is a highly toxic, the lethal dose for humans is 50-200 mg. However, on reaching the environment cyanide, heavy metals are linked to cyanide in the long run are the biggest problem. Cyanide breaks down relatively quickly, however heavy metals remain forever in the environment.
Acid drainage is a serious problem in many metal mines, since metals such as gold, copper, silver and molybdenum are often associated with sulfides. By not controlling acid mine drainage, filter streams, rivers and groundwater. Acid water and heavy metals are lethal to fish, animals and plants and can still cause damage to the environment indefinitely after mine closure.
Opencast mining and the original ecosystem Read the rest of this entry »