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In page Coke (fuel):

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Many historical sources dating to the 4th century describe the production of coke in ancient China.[1] The Chinese first used coke for heating and cooking no later than the 9th century.[citation needed] By the first decades of the 11th century, Chinese ironworkers in the Yellow River valley began to fuel their furnaces with coke, solving their fuel problem in that tree-sparse region.[2] By 1078 CE, the implementation of coke as a replacement to charcoal in the production of iron in China dramatically increased the industry to 125,000 tons per year. The iron was used for the creation of tools, weapons, chains for suspension bridges, and Buddhist statues.[3]