The Rio Tinto Limited ( ASX: RIO ) share price hit as 52-week high of $89.65 this morning on the back of an iron ore price that has surged all week to above US$77 per tonne after another tragic iron ore mining accident in Brazil that has caused the deaths of at least 63 people. It's possible that iron ore supply out of Brazil may fall as a result of the accident after the Brazilian government moves to impose extra regulation on the industry, sanctions, and potentially criminal prosecutions against Vale S.A. and its executives. Rio Tinto boasts it operates the world's largest integrated iron ore mines in Western Australia's Pilbara and as such is unlikely to be affected by the accident in Brazil, other than being a potential beneficiary of rising iron ore prices if supply out of Brazil is hit.