Aluminum Corp of China (Chalco) has started cutting back 30% of the capacities at its smelter

and refinery in Henan's Jiaozuo city this week, ahead of the originally scheduled winter cutbac

k policy deadline in mid-November, a company official confirmed to S&P Global Platts Wednes

day. 

The Jiaozuo local authorities have also issued a statement about the cuts this week, citing env

ironmental protection factors. 

"The air in Jiaozuo is very bad, that's the main reason we're starting the winter cuts earlier in t

hat area," the Chalco official said. 

"There are no plans for early winter cuts in our other plants in Henan or other regions yet, but

we cannot rule out the possibility," he added. 

Chalco's Jiaozuo Wanfang smelter has an aluminum capacity of 430,000 mt/year and its Zhon

gzhou refinery, also located in Jiaozuo, has an alumina capacity of 2.6 million mt/year. 

The Chalco official declined to provide details on current run rates at the plants, but said the

full 30% capacity cuts, which started on September 19, should be completed within the mont

h. 

News of the cuts has boosted domestic Chinese aluminum and alumina prices this week, and

is likely to support higher price levels in the near term, market sources said. 

The front-month aluminum contract on the Shanghai Futures Exchange closed at Yuan 16,94

5/mt ($2,586) on Wednesday, up 3.4% on the day, 3.6% on the week, and 3.8% on the mont

h. 

Domestic spot alumina prices were heard trading around Yuan 3,450-3,500/mt cash to partial

credit terms on Wednesday, up from Yuan 3,350-3,400/mt previously.