A Mexican mine run by a Canadian company embroiled in a controversy around the death of a local activist has been shut down over environmental concerns. Carolina Ochoa of the Ministry of Environment for the state of Chiapas cited several alleged infractions by the Blackfire Exploration mine, including building roads without authorization, polluting and causing toxic emissions…[but] denied the mine's closure has anything to do with last month's murder of anti-mining activist Mariano Abarca Roblero...Three men have been arrested in Abarca's death and a document from the state's attorney general says all are linked in some way to the...company. A spokesman for Blackfire has condemned the activist's killing and said the company was in no way involved. A communique obtained by The Canadian Press on Tuesday detailed the progress being made in the criminal investigation…