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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
the manual removal of valueless rocks or harmful impurities 40–350 mm in grain size from minerals moving along a conveyor belt. Handpicking is not widely used.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.