BHP Billiton announced recently in Western Australia's integrated Nickel West Leinster Perseverance of mining area affected by underground earthquake and the company has to suspend mining operations so far. The company is estimating the impact of the disaster. Meanwhile, the company integrated Nickel West mining area in Mt Keith,Cliffs, Kalgoorlie, Kambalda and Kwinana do not affect normal operations currently. BHP said despite the Kwinana nickel refinery to normal production in the short term, but it will cause sales of nickel production.to drop for integrated Nickel West mining area in the fourth quarter of this year.