PRESS RELEASE JSC ALROSA Announces Purchase of a 25 Percent Interest in OJSC Polyus Gold August, 2007, Moscow. Joint-Stock Company ALROSA signed an agreement with ONEXIM Group to buy a 25 percent stake in the Open Joint-Stock Company Polyus Gold (RTS, MICEX, and LSE – PLZL), Russia’s largest gold producer. “This deal was implemented as part of the development strategy approved by the Supervisory Board of JSC ALROSA. Among other things, ALROSA focuses on diversifying into other sectors. The purchase of a significant stake in Polyus Gold, which pursues an effective production strategy, will enable ALROSA to access a market with considerable long-term prospects and will further boost the development and economic growth of regions in Central and Eastern Siberia,” said President of ALROSA Sergei Vybornov. Open Joint-Stock Company Polyus Gold (RTS, MICEX, and LSE – PLZL) – is the leading gold producer in Russia and one of the biggest players in gold mining in the world in terms of deposits and production. The asset portfolio of Polyus Gold includes ore and alluvial gold deposits in the Krasnoyarsk Territory, the Irkutsk, Magadan, and Amur regions, and in the Republic of Sakha (Yakutia), where the company operates gold exploration and mining projects. As of January 1, 2007, the mineral resource base of OJSC Polyus Gold comprises 3,000.7 tons of gold in B+C1+C2 reserves, including 2,149 tons of B+C1 reserves. Joint-Stock Company ALROSA – is a global leader in diamond exploration, mining and sales of rough diamonds, and in cut diamond manufacture. ALROSA accounts for 97 percent of Russia’s rough diamond production and for 25 percent of the global output of rough diamonds. .