Companies such as BHP Billiton have developed policies that indicate they will not utilise waterways as a dumping ground for mine waste and groups ranging from World Vision and Oxfam to the Construction Forestry Mining and Energy Union have supported a call for a ban on these practices.media enquires: Techa Beaumont 0409 318 406FUTHER INFORMATIONAs a proxy on behalf of shareholders from the Rio Ti