Tailings, also called gangue, are the rejected material from mining and screening operations. Tailings are the uneconomic remainders from mining; as mining techniques and the price of minerals improve it is not unusual for tailings to be reprocessed using new methods or more thoroughly with old methods, perhaps to recover minerals other than those originally mined. The El Chino Mine located near Silver City, New Mexico is an open-pit copper mine Mining is the extraction of valuable minerals or other geological materials from the earth, usually (but not always) from an ore body, vein, or (coal) seam. ...
Large-scale operations often leave huge piles of this material on site. Often, as in the case of riverbed metal extraction, this has buried valuable river-flat soils under the largely worthless and often contaminated tailings. Modern extraction methods have resulted in less damage but land rehabilitation continues to be a major problem and costly consideration. In chemistry, liquid-liquid extraction is a useful method to separate components (compounds) of a mixture. ... For the heavy metal band see Soil (band) Soil is the layer of minerals and organic matter, in thickness from centimetres to a metre or more, on the land surface. ... The Lachine Canal, in Montreal, is badly polluted Pollution is the release of harmful environmental contaminants, or the substances so released. ... Land rehabilitation is the process of returning the land in a given area to some degree of its former self, after some process (business, industry, natural disaster etc. ...
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