Osmium always occurs associated to other platinum metals, being however, the less abundant of these. The metals of this family occur mainly in Canada, in South Africa and in some countries of ex-USSR. From the Canadian deposits a mixture of ores is extracted that contain copper-nickel sulfides associated to volcanic rocks. The main deposits of South Africa are located in Merensky, northwest of Johannesburg. In Russia there are wide deposits of this metal in minerals like peridotite, in the area of Noril'sk, Siberia. Considerable deposits of native osmium in the Ural Mountains also can be met. Although in smaller amounts, platinum is extracted in Colombia and in Alaska.