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The traders said only Australian shipments were affected; Australia was China's largest coal supplier.
"We have stopped ordering coal from Australia because we don't know how long the restrictions will last," said the manager of a Shanghai trading company, which usually buys about 400,000 tons of Australian coal a month.
Customs clearance usually takes 5-20 days. The manager said the customs clearance could now last up to 45 days; he asked not to be named because he had not been authorized to speak to the media.
It is not clear why China has stepped up import censorship of Australian goods, but in recent months, issues such as cyber security and China's influence on Pacific island countries have led to tensions between China and Australia. The General Administration of Customs did not respond to the request for comment. The Ministry of Foreign Affairs did not immediately respond.
The Shanghai manager said that some port authorities told importers verbally this month that Australian power coal and coking coal would need to be cleared for longer than usual.
Similar notifications were received from a coal dealer and a purchasing supervisor at a coke plant in Beijing. No buyer knows why.
The Beijing dealer said that the Australian import restriction was "the first time Beijing has restricted coal imports from a particular country, and there is no reason for it."
China Zhengzhou Commodity Exchange's hottest coal futures hit 594 yuan on Monday, not far from a three-month high of 595.6 yuan, but the contract ended down 1% to 583.8 yuan.