The Udachnaya pipe (Russian: Уда́чная, IPA: [ʊˈdat͡ɕnəɪ̯ə]; lit. 'Lucky') is a diamond deposit in the Daldyn-Alakit kimberlite field in Sakha Republic, Russia. It is an open-pit mine, and is located just outside the Arctic Circle at 66°26′N 112°19′E.
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