The Udachnaya Diamond Mine (Udachny) is located within the Arctic circle in the Sakha Republic of northeastern Russia. The mine is an open-pit operation taking place on a kimberlite field. The Udachnaya (meaning Lucky) pipe is the largest diamond deposit in Russia, and one of the largest in the world. The mine consists of two main bodies which are both diamondiferous (consisting of heavy mineral sands). The Udachnaya mine is one of the largest open pits in the world and has yielded a high quantity of large diamonds. The Mirna and Udachnaya kimberlite fields were discovered within ten days of eachother.