BHP Billiton is the world's largest mining company, with a wide variety of operations in 25 countries around the world. The company is engaged in extracting and processing minerals, oil and gas from its production operations located primarily in Australia, the Americas and southern Africa. It sells its product worldwide with its marketing activities centralized in Singapore, The Hague and Antwerp. The company operates in nine customer sector groups including petroleum, aluminum, base metals, diamonds and specialty products, stainless steel materials, iron ore, manganese, metallurgical coal, and energy coal.