Gold is often found in Siberia; currently the principal mining districts are in the Patom Highlands (Olekma-Vitim region of the Lena Valley). During the period 1910-1914, the Siberian gold mines extracted an average of 46,655 kg and employed 57,000 workers. Exploited deposits are of placer gold. The joint British Russian Company, Lena Gold Mining Joint Stock Company (Lenzoloto), owned and operated the "Lena Goldfields" -- much of the region's gold production. Their mistreatment of workers ultimately led to the Lena massacre which ignited the Russian Revolution; the British shareholders secured compensation from the Soviet government in 1935. Russia remains the second biggest gold producer in the world, while using modern workplace standards.