Royal Dutch Shell plc (RDSB.LN) is restarting production at its Ursa platform in the Gulf of Mexico, spokeswoman Darci Sinclair said Thursday.

The platform, which produces nearly 100,000 barrels a day, was shut around Nov. 3, and a short maintenance down time was prolonged by strong ocean currents that prevented divers from making unexpected repairs.

The longer-than-expected shutdown of Ursa and the larger Mars platform nearby inflated the value of lower-quality oil by $4 on the Gulf Coast.

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