Nickelbearing

Nickelbearing describes any material that contains nickel as a constituent element. In geological contexts it refers to minerals and rocks with notable nickel content, and in metallurgy to ores from which nickel can be economically extracted.

Nickel occurs in various minerals; the most important nickel-bearing ore is pentlandite, often accompanied by pyrrhotite and chalcopyrite in sulfide deposits. Other nickel-bearing minerals include millerite (NiS), niccolite or nickeline (NiAs), and garnierite group minerals which are nickel-rich silicates. Nickel is also concentrated in laterite deposits formed by tropical weathering, producing nickel-bearing oxides and hydrated silicates such as garnierite.

Extraction typically divides between sulfide deposits, processed by flotation to produce concentrates followed by smelting and refining, and laterites, which require hydrometallurgical methods such as high-pressure acid leaching or ammoniacal leaching. Global nickel production is concentrated in countries with sulfide or laterite resources, including Indonesia, the Philippines, Russia, Canada, Australia, and New Caledonia.

Nickel is widely used to produce stainless steel and specialty alloys, and in batteries for portable electronics and electric vehicles, among other applications.

Mining and processing nickel-bearing materials can generate environmental concerns, including tailings management and sulfur-oxidation risks; nickel exposure can cause dermatitis in sensitive individuals.