Mine blasting question

[Mel?mana]

Would someone be kind enough to explainto me WHY the mines are permitted to blast away at night, as they've been doing for two hours - and it's 11 p.m. The city resounds like Sarajevo under siege, and the total lack of respect for citizens once again, bewilders me. Has no one thought, that on a Thursday night, parents still have to awaken at 5;30 to get their kids to school - children who've been terrified in their sleep by the dreadful noise? I live near Dos Ríos and the noise echoes everywhere.Having lived in Mexico many years, I still fail to understand why the government allows Canadian mining companies to violate all natural laws. And I'm ashamed to be a Canadian right now. Thanks for any info.