By Ese Erheriene 

The U.K. Supreme Court said Thursday that Russia's United Co. Rusal PLC can't appeal against reforms to metal storage rules, ending a lengthy dispute with the London Metal Exchange.

Rusal, the world's largest aluminum producer by volume, had challenged changes to LME rules on how metal is loaded into and out of warehouses. It had won a ruling in its favor in March, but lost on appeal in October.

The Supreme Court was Rusal's last avenue of appeal. In its judgment Thursday, the Supreme Court said Rusal did "not raise an arguable point of law."

The storage of large amounts of aluminum by warehouses had caused queues to build up. Some customers waited up to two years to receive their deliveries of the metal, and prices rose.

To address these issues, the LME proposed changes to its storage rules that forced warehouses with logjams of more than 50 days to load out more metal than they took in, until waiting times fell.

Rusal objected on the grounds that the metal exchange had harmed its economic interests by not properly consulting with the industry.

The new warehousing rules are intended to take effect on Feb. 1, 2015.

"The implementation of LILO [load-in, load-out rule] will take place as planned and the remaining elements of our warehouse reforms package will also be addressed," said the LME.

Rusal's spokeswoman, Vera Kurochkina, said the company was "disappointed" by Thursday's court ruling. However, she said the LME's new rules were "likely to have little effect on queues or premiums" because the market was no longer in surplus, but instead had a supply deficit after production cuts.

"Accordingly, market conditions today are fundamentally different than the conditions in existence at the time the rule change was first proposed," she added.

The LME, owned by Hong Kong Exchanges & Clearing Ltd., is the biggest global financial market for industrial metals, and it operates the physical transfer of metals through a network of LME-registered warehouses around the globe.

Metal buyers had complained that the sums they had to pay to get metal without waiting in line at the warehouses had reached record highs. Some filed lawsuits in the U.S., complaining that financial firms were essentially hoarding metal to drive up prices, although the claims were dismissed by a U.S. District Court.

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