The Udachnaya pipe (Russian: тру́бка Уда́чная, literally lucky pipe) 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 .
Udachnaya was discovered on 15 June 1955, just two days after the discovery of the diamond pipe Mir by Soviet geologist Vladimir Shchukin and his team. It is about 640 metres (2,100 ft) deep, making it the third deepest open-pit mine in the world (after Bingham Canyon Mine and Chuquicamata).
The nearby settlement of Udachny is named for the deposit.
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- "Udachny town, Yakutia, established by Udachnaya Pipe in 1968". Moi gorod (in Russian). Retrieved 2006-12-31.
- М. Владимиров; Р.М. Лобацкая; Н.В.Воронцова; В.М.Усачев (2006). МИРОВОЙ РЫНОК ЮВЕЛИРНЫХ КАМНЕЙ (in Russian). Irkutsk: IrGTU. p. 107. Archived from the original on 2007-02-25. Retrieved 2006-12-31.
- "Diamond deposits in the Sakha Republic". rough-polished.com. 25 June 2012.
|Wikimedia Commons has media related to Udachnaya pipe.|
- Satellite photo of the Udachnaya pipe
- Alexeev, Sergey V; Alexander V. Drozdov; Tatyana I. Drozdova; Ludmila P. Alexeeva (2006-03-16). "The First Experience of Saline Drainage Waters Disposal from the Udachnaya Pipe Quarry into Permaforest". Institute of Arctic and Alpine Research, University of Colorado at Boulder.