rio de janeiro court brazil decide monday resume criminal proceed include consideration murder charge relate 2015 samarco mine disaster throw challenge two defendants claim evidence illegally collect vale sa bhp billiton ltd joint owners samarco iron mine part group include 22 people two company stand accuse crimes relate tail dam burst burst unleash torrent toxic mud kill 19 people court state minas gerais suspend proceed july consider claim two samarco executives allege phone data instant message email illegally collect outside period legally authorize judge rule certain material base transcripts corporate email chat invalid impact validity telephone surveillance evidence federal prosecutors say statement brazil resume murder trial samarco mine disaster