Malachite is a copper carbonate found in oxidised zones of copper deposits. Limestone, or dolomite, around the copper deposits will be the source of the carbonate. A large belt of copper deposits - actually called the “copperbelt” - is stretching from Katanga into Zambia. The Copperbelt is one of the richest sources of copper in the world. Cobalt, selenium, silver, and gold are also produced in this belt.