Nickel (Ni) was obtained for the first time by the Swedish chemist A.F. Cronstedt, in 1751, who suggested the name for the element. Although nickel (Ni) is a common constituent of the Earth’s crust being more widely distributed than copper, lead and zinc. Nickel has been found in economic quantities only in Canada, New Caledonia, Finland, Russia, Cuba, Griqualand, although other deposits are known. By far the most important of these areas is the Sudbury region of Ontario, Canada. The presence of nickel (and copper) in this region was known as early as 1856. In 1889, the Oxford Copper Co found a separation method for nickel and copper sulphides by taking advantage of their differing solubilities in sodium sulphide. The copper sulphide is readily soluble and nickel sulphide is practically insoluble.