June 13, 1955: Innumerable Carats of Ice Amid Actual Siberian Ice

Soviet geologists in eastern Siberia discover a massive deposit of diamond in what will become the Mir mine, the second largest excavated pit in the world.

Source: http://www.wired.com/thisdayintech/2012/06/june-13-1955-innumerable-carats-of-ice-amid-actual-siberian-ice/

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