MOSCOW, March 14 (Reuters) – The Russian Direct Investment Fund (RDIF): * Announces a joint investment in Russian mining company Intergeo along with the Russia-China Investment Fund and a leading Middle Eastern sovereign wealth fund; * Intergeo is part of Onexim Group, which manages the assets of Russian businessman Mikhail Prokhorov. * Intergeo owns several mineral deposits with significant copper and nickel reserves, including the Kingash deposit in Russia’s Krasnoyarsk region and the Ak-Sug deposit in the southern Siberian Tuva region. * RDIF said in January it was planning to set up a new company to supply base metals to China from an existing deposit that had been untapped for a long time.