the premium for Us Gulf coast mid-sulphur petroleum coke to high-sulphur coke widened in late November to the highest level since April amid strong mid-sulphur demand globally and lower output in the US Gulf. The premium reached $23.50/t on 21 November, up from $10.50/t a month before and $6/t at the end of September, but still was below the record high of $30.50/t in early April. This premium was also equal to around 15pc of the $157/t 4.5pc sulphur fob US Gulf price, compared with 13pc of $235.50/t at the start of April. The premium eased slightly as of the latest assessment today, to $20/t, as mid-sulphur demand in China has begun to wane. But it is still high on a historical basis.
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