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She triumphed after a nailbiting competition to take DPR Korea's Weightlifting gold medal count to three at the 2012 Olympic Games and continue the nation's remarkable surprise performance.
Rim's gold was confirmed on the penultimate lift while bodyweight alone separated second, third and fourth place.
Roxana Daniela Cocos of Romania claimed silver after she lifted 256kg.
The weight category was wide open after Russia's gold medal favourite Oksana Slivenko, world and European champion, was forced to withdraw last week due to injury.