Yunnan Tin Company began a 35 day regular maintenance shutdown of its main smelter at Gejiu, Yunnan province on Sunday. “The maintenance will not have any impact on products other than tin ingots. It will also have a relatively small impact on company’s planned annual tin ingot output,” it said in a statement to the Shenzhen stock exchange.

The smelter in Gejiu has an annual refined tin capacity of 70,000 tonnes, a company official told Dow Jones. also produces tin and tin products at a smelter in Chenzhou city, Hunan province. The Gejiu smelter was last closed for maintenance in September 2010. produced 59,160 tonnes of refined tin last year, making it the world’s largest producer for the sixth year in succession.