Underground Mine Development International Mining
Taking Codelco El Tenientes New Mine Level NML as just one example between 2011 and 2017, the project will build 98,450 m of horizontal tunnels and 3,454 m of vertical development in the form of ventilation shafts and transfer shafts. Not only that, but access to the NML will be through two parallel tunnels, one entry and exit tunnel for employee buses, and the other for the ore




































