(Kitco) U.S. steel, aluminum execs invited to White House for possible announcement > China’s industry ministry to crack down on aluminium price speculation > Gold slips to three-week low as dollar holds firm > Aluminium producers offer Q2 premiums of $133/T, $132/T to Japan buyers -sources > Brazilian court orders Hydro alumina cuts on contamination worry > China’s top steelmaking city extends level 2 pollution alert > Voestalpine CEO confident about reaching full-year targets > South Africa’s Implats reports narrower HY loss, Marula turnaround > Chinese steel futures rise on expectations more cities could keep cutting output > Shanghai copper slides, but other metals rise after upbeat China data > Russia’s Evraz swings to net profit, recommends dividend > Mongolia’s Oyu Tolgoi mine to lift force majeure > Vale aims to cut nickel output costs as world glut looms > Mongolian court sides with government in copper mine ownership row