Peru's government has cancelled a vast copper mining project after clashes between police and protesters left three people dead earlier this week. The mining ministry said the environmental impact assessment presented for the $1bn (£600m) project was "inadmissible". Local residents had been protesting against the proposed mine, saying it could contaminate water supplies. The Tia Maria project...It was being developed by Southern Copper [part of Grupo México]...But thousands of farmers and other residents of Islay province have been blocking roads in protest at the development.