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acid mine drainage
Drainage from mines and mine wastes which have nearlr a pH of 2.0 to 4.5 . It results from the oxidation of sulfides exposed during mining, which produces sulfuric acid and sulfate salts.
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aerial mapping
The taking of aerial photographs for making maps.
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aerosol
A suspension of ultramicroscopic solid or liquid particles in air or gas, as smoke, fog, or mist.
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aftercooler
A device for cooling compressed air between the compressor and the mine shaft.
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afterdamp
The mixture of gases that remain in a mine after an explosion of combustible gases. It consists basically of carbonic acid gas and nitrogen which is irrespirable.
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agent
When used in relation to a mine, means every person, whether appointed as such or not, who, acting or purporting to act on behalf of the owner, takes part in the management, control, supervision or direction of the mine or of any part thereof.
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agglomeration
In beneficiation, a concentration process based on the adhesion of particles to water. Loosely bonded associations of particles and bubbles are formed that are heavier than water; To separate the agglomerates from nonagglomerated particles flowing-film gravity concentration is used .
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airblast
A disturbance in underground workings accompanied by a strong rush of air. The rush of air, at times explosive in force, is caused by the ejection of air from large underground openings, the sudden fall of large masses of rock, the collapse of pillars, slippage along a fault, or a strong current of air pushed outward from the source of an explosion.
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