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ConExpo,  · Free Online Library: ConExpo-Con/Agg a Huge Success Despite Challenges.(IN THE KNOW) by "Rock Products"; Business Petroleum, energy and mining Convention bureaus Trade show management firms Trade show management servicesTailings,  · Tailings are the materials left over after the process of separating the valuable fraction from the uneconomic fraction (gangue) of an ore. Tailings are distinct from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed. The extraction of minerals from ...