Australia's BHP Billiton (BHP) is the WORLD' LARGEST supplier of Manganese ore. According to Wikipedia.com, manganese is used for steel production and its use in steelmaking accounts for about 85-90% of the commodity's total demand.
BHP is also the world's 3rd largest supplier of nickel, seaborne iron ore, copper, silver and lead.
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*FYI, if BHP's proposed merger with Rio Tinto (RTP) were to go through the $450 Billion combined entity would supply 20% of the total iron ore (essential for steel production) consumed by China.
Data Courtesy: CNBC.