A crew of about 600 recovered 90 percent of the four tonnes of crude oil that spilled from a storage tank into the Zhouhe river in northwest China.
Workers at Yongning Drilling Co. were cleaning a tank when another burst leaking 10 tonnes of crude oil of which 4 tonnes spilled into the river causing a 5.6 mile slick.
The clean-up crew built 6 makeshift mini dams to prevent the slick from expanding.
Zhouhe is a tributary of the Luohe river which flows into the Yellow river, the country's second longest.
A crude oil spill from a pipeline run by a state oil firm in a eastern coastal province in China caused locals to rush to collect the oil and sell it to refineries for a profit.
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