Sociedade de Desenvolvimento Mineiro (SDM) is an Angolan public mining company and holds the mining rights in an area of concession of 2,950 km2, located in the hydrological basin of Cuango River, Lunda Norte Province. As joint venture, its board of shareholders includes the following companies: Endiama (National Diamond Company of Angola), an Angolan public company and OMSI (Odebrecht Mining Services Inc), a Brazilian private company.