▁in ▁ 1 9 7 6 , ▁Bol iden ▁launched ▁a ▁Kal do ▁type ▁furn ace , ▁ ▁for ▁processing ▁met als . ▁ 1 9 7 6 ▁also ▁saw ▁Bol iden ▁launch ▁the ▁first ▁flash ▁sm el ting ▁furn ace ▁for ▁lead , ▁applying ▁Kal do ▁technology , ▁at ▁R ön n sk är . ▁ ▁In ▁the ▁mid - 1 9 8 0 s , ▁Bol iden ▁export ed ▁a ▁total ▁of ▁ 2 0 , 0 0 0 ▁t onnes ▁of ▁met all ic ▁resid ues ▁from ▁the ▁R ön n sk är ▁sm elter ▁to ▁a ▁Chile an ▁company , ▁Prom el , ▁for ▁processing . ▁Bol iden ▁paid ▁Prom el ▁for ▁processing ▁work ▁that ▁was ▁never ▁carried ▁out ▁and ▁the ▁resid ues ▁were , ▁instead , ▁stored ▁on ▁the ▁out sk ir ts ▁of ▁the ▁town ▁of ▁Ar ica ▁at ▁a ▁site ▁which ▁was ▁converted ▁to ▁a ▁low - cost ▁resident ial ▁area ▁in ▁the ▁ 1 9 9 0 s ▁on ▁the ▁instructions ▁of ▁the ▁social ▁services . ▁The ▁residents ▁were ▁una ware ▁of ▁the ▁waste ' s ▁presence ▁and ▁as ▁a ▁result , ▁many ▁people ▁came ▁to ▁harm . ▁In ▁the ▁aut umn ▁of ▁ 2 0 0 9 , ▁the ▁Chile an ▁government ▁announced ▁that ▁the ▁ 7 , 0 0 0 ▁or ▁so ▁residents ▁of ▁the ▁area ▁would ▁be ▁ev acu ated . ▁The ▁waste ▁was ▁export ed ▁before ▁the ▁Bas el ▁Convention ▁prohib iting ▁the ▁export ▁of ▁environment ally ▁ha z ard ous