Steven Tambanis

Optimal Mining Ltd. engages in mining and exploration services. The company is headquartered in Sydney, Australia.

Australasian Institute of Mining & Metallurgy, also known as AusIMM, is the leading organization for professionals working in the resources sector. AusIMM is based in Carlton, Australia, and has subsidiaries in Hong Kong. The Australian company's main focus is on shaping careers, showcasing leadership, creating communities, and upholding standards.

Goldminex Resources Ltd. explores gold, nickel and copper. The company continues exploration within the Owen Stanley Ranges and Sepik Province in Papua New Guinea. It focuses on gold, copper and nickel deposits in an environment with some of the most prospective and underexplored geology in the world. The company was founded by Peter Tambanis on April 24, 2006 and is headquartered in Melbourne, Australia.

WMC Resources Ltd. explores and mines for minerals including nickel, alumina, copper, gold, uranium, fertilizer, and talc. The company has operations in Australia, Asia and America. It was founded in 1933 and is headquartered in Southbank, Australia.