LLP Semyzbay-U was founded in December 2006. The main purpose of creation of LLP Semyzbay-U is the realization of projects of development of uranium deposits Semyzbay located in the Enbekshilder District of Akmola Region.

Construction of the mine at Semyzbay field was launched in 2007, and in 2009 the first production was derived.

Since 1 November 2008, LLP "Ore Mining Company" entered  to  the participant membership of LLP Semyzbay-U by making the charter capital  of Irkol mine, located in Shiyeli District of  Kyzylorda Region.

In the same year 49% stake was sold to a Chinese company with limited liability Beijing Sino-Kaz Uranium Resources Investment Company Limited (Sino-Kazakh) (49%). Participants of the partnership became JSC NAC Kazatomprom -11%,  LLP Ore Mining Company - 40%, Beijing Sino-Kaz Uranium Resources Investment Company Limited (Sino-Kaz) - 49%

After LLP Ore Mining Company joined  to JSC Kazatomprom, share of majority participant accounted for 51%.