ENV100Y5 Lecture Notes - Lecture 36: Surface Mining, Leachate, Potash
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Document Summary
Topic-minerals: mining methods and their impacts : Strip mining removes surface layers of rocks and soil : when resources occurs in shallow horizontal deposits near surface , most effective mining method is strip method. In this layers of rock and soil are removed from large areas exposing the resource: economically efficient method. It removes vegetative cover and nutrient rich top soil. Subsurface mining takes place in underground tunnels : this method is used when resources occurs in concentrated pockets or seams below earths surface. It can pollute surface and groundwater by generating amd through chemical interaction of of water with sulphuric bearing tailings and waste rock piles: canada"s mmer- metal mining effluent regulations of composition of any contaminated liquid from mining sites. Open pit mining creates immense holes at surface : when mineral is spread widely and evenly throughout a rock or when rock is unsuitable for tunnelling then this method is used.
