According to the Australian High Commission, there are about 3,000 to 4,000 Australians living and working in India. Industries such as hospitality, financial services and mining and materials have relatively higher concentration of Australian expatriates. About 1,000 Australian companies evince interest in doing projects in India every year despite the challenges of "bureaucracy" and "delays" as opportunities outnumber these impediments. At present, there are about 60 Australian companies working in the infrastructure sector in India. Large Australian firms such as BHP Billiton, Rio Tinto, Snowy Mountain Engineering, Macquarie Group and Leighton Holdings have operations in India.