Russia\'s largest gold producer Polyus Gold boosted output 21 percent year on year in the first half of 2011, to 611,000 ounces, the company said on Tuesday. The company\'s revenues from gold sales increased by an estimated 50 percent in that period to $909 million, Polyus Gold said in a statement. The average selling price grew 25 percent to $1,445 per troy ounce, Polyus said. Moscow-based Polyus Gold\'s mines and development and exploration projects are located in five major gold mining regions in Russia - Krasnoyarsk Territory and Irkutsk Region in Siberia, the Far Eastern Magadan and Amur Regions, and the Republic of Sakha (Yakutia) in East Siberia.