BHP Billiton Limited is diversified natural resources company. The Company generally operates through customer sector groups (CSGs). The Company operates in nine segments: Petroleum, Aluminium, Base Metals, Diamonds and Specialty Products, Stainless Steel Materials, Iron Ore, Manganese, Metallurgical Coal and Energy Coal. As of June 30, 2012, the Company was working in more than 100 locations worldwide. During the fiscal year ended June 30, 2012 (fiscal 2012), the Company total petroleum production was 222.3 millions of barrels of oil equivalent. During fiscal 2012, its aluminium had a total production in 1.2 million tones (Mt) of aluminium. In August 2011, the Company acquired Petrohawk Energy Corporation. On September 30, 2011, it acquired HWE Mining Subsidiaries from Leighton Holdings. On September 7, 2012, the Company announced the sale of its 37.8 % non-operated interest in Richards Bay Minerals.