BRIEF-Norsk Hydro extends planned maintenance at quarry in Brazil
March 18 (Reuters) - Norsk Hydro :
* Says extends maintenance at Paragominas in Para, Brazil, to last until the second half of April from a previous plan to start by the second half of March
* Paragominas normally operates with two ball mills, and with one ball mill out for maintenance, production at Paragominas is now running at 50 percent of capacity
* Paragominas has a nameplate capacity of 9.9 million tonnes
* Production at Hydro's Alunorte alumina refinery unaffected Source text for Eikon: Further company coverage: (Reporting By Stine Jacobsen)
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