Coal markets were mixed across the US, with sustained high-sulfur allowance prices maintaining premia for many low-sulfur products but stable production and mitigated buyer urgency to rebuild stockpiles leavening demand in many markets. Renewed trouble with rail deliveries in the Powder River Basin halted recent growth in that market, which surged to life earlier this year as rail constraints eased, and prices for the increasingly-dominant low-sulfur Western fuel were broadly flat in the week. A pair of derailments cut off supply to some customers this week, and fueled interest in some other low-sulfur specs, including the Colorado-Utah coals, giving them a slight boost in the week.
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