In the last few months, mining giant Alrosa has announced the recovery of three huge rough gems, all from the same source – a mouthful of a pipe called Nyurbinskaya, located 315 km northeast of Mirny in East Siberia. In June, the miner recovered a 241.21-carat rough diamond from the pipe. A month afterwards, it discovered a 214.65-carat diamond there. And in August, Alrosa announced the recovery of a 136.24-carat diamond from the Nyurbinskaya pipe.
The Nyurbinskaya deposit was discovered in 1996. It is considered a highly diamantiferous placer deposit with considerable reserves of ore. The average diamond grade is more than 5.7 carats per ton.
The Nyurbinsky open-pit mine was put into operation in 2001. In 2015, reserves were identified to amount to 36.9 million carats. In 2015, the pipe accounted for 13% of rough diamond production by the Alrosa Group. In the first half of 2016, diamond mining grew 3% against the first six months of 2015.
The Nyurbinskaya pipe is operated by the Nyurba Mining and Processing Division – one of the Russian miner youngest enterprises, which also operates the Nakyn ore field and develops the Botuobinsky open-pit mine. According to the same source, its share in Alrosa Group’s production totaled 20% in 2015. Diamond mining in the first half of 2016 amounted to 3,315 thousand carats, having shown a 4% growth as compared with the similar period of 2015.