Oct 11 (Reuters) -China's major copper smelters in September kept outputflatmonth on month, as maintenance and curbs on power usageprevented them from making more metal and cashing in on highertreatment charges, Antaike said on Monday. The 22 smelters surveyed by Antaike churned out 768,300tonnesof refined copper cathode last month, versus 767,600 tonnes inAugust and up 3.8% year on year, the state-backed Chineseresearch house said in a note.Rebounding copper concentrate treatment charges and highpricesfor byproduct sulphuric acid mean China's smelters are reluctantto carry out maintenance in October, but power rationing willnonetheless restrict output, said Antaike. It sees cathode production rising slightly month-on-monthtoaround 780,000 tonnes in October. (Reporting by Tom Daly; Editing by Steve Orlofsky) Disclaimer: The views expressed in this article are those of the author and may not reflect those of Kitco Metals Inc. The author has made every effort to ensure accuracy of information provided; however, neither Kitco Metals Inc. nor the author can guarantee such accuracy. This article is strictly for informational purposes only. It is not a solicitation to make any exchange in commodities, securities or other financial instruments. Kitco Metals Inc. and the author of this article do not accept culpability for losses and/ or damages arising from the use of this publication.