BHP is among the world’s top producers of major commodities including iron ore, metallurgical coal, copper and uranium. They also have substantial interests in oil, gas, and energy coal. BHP extracts and processes minerals, oil and gas from their production operations located primarily in Australia and the Americas. Their products are sold worldwide, with sales and marketing led through Singapore and Houston, United States. Their global headquarters are in Melbourne, Australia. BHP operates under a dual listed company structure with two parent companies: BHP Billiton Ltd and BHP Billiton Plc. BHP is a global resources company with annual sales of over $56 billion.