La Oroya polymetallic smelter had been operated by Doe Run Peru, a unit of the U.S.-based Renco Group, from 1997 until the company went bankrupt in 2009 and its assets were transferred to a group of former creditors.
Rio Tinto shareholders that voted in favour of a resolution calling the miner to review its membership of the Minerals Council of Australia (MCA) and other lobby groups.
The miner and commodities trader is embroiled in a legal tangle over its copper and cobalt operations in Democratic Republic of Congo, where conflict and changes to regulations have deterred many mining firms.
Brazil on Wednesday contradicted a United States announcement that the two countries had reached a deal on a permanent exemption from steel and aluminum import tariffs, saying the Trump administration had unilaterally cut off talks.
Greg Barker welcomed a decision by the U.S. Treasury on Tuesday to give investors an extra month to divest or transfer their holdings in En+ Group and other sanctions targets.