Sukhoi No. 135 in Kharkiv, Ukraine. However, Sukhoi was not satisfied with its location, since it was isolated from the scientific pole of Moscow. Sukhoi later relocated the bureau to the aerodrome of Podmoskovye in Moscow, completing half of the relocation by 1940. Sukhoi encountered another issue: the bureau had no production line in Moscow, thus making it useless as Sukhoi had nothing to do. During the German invasion of the Soviet Union in World War II, the Su-2 needed a successor as it was proved obsolete and under-armed against German aircraft, with 222 aircraft destroyed in total. Sukhoi and his
Sukhoi Log mine studies. During these events the gold was likely remobilized and other ore minerals (e.g. pyrite) formed to create the present day state of Sukhoi Log. A summary of the known ages and events is given in Hnatishin and Kravchinsky (2014) Sukhoi Log mine The Sukhoi Log is one of the largest gold reserves in Russia and in the world The reserve is located in Irkutsk Oblast and has estimated reserves of 64 million oz of gold, but has a low grade. During the 1990s a proposal was made to mine Sukhoi Log by the semi-private Russian company Lenzoloto with the