The Udachnaya pipe (, ; ) is a diamond deposit in the Daldyn-Alakit kimberlite field in Sakha Republic, Russia. It is an Open-pit mining, and is located just outside the Arctic Circle at .
The nearby settlement of Udachny is named for the deposit.
, Udachnaya pipe is controlled by Russian diamond company Alrosa, which planned to halt open-pit mining in favor of underground mining in 2010.
The mine has estimated reserves of of diamonds and an annual production capacity of .
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