Arrange visits through Codelco by phone or email. Tours (minimum age eight) run on weekdays, in English and Spanish. Report to the Oficina on the corner of Avs Granaderos and Central Sur 15 minutes before your tour; bring identification.

The two-hour tour begins at 1pm. Wear sturdy closed-toe shoes (no sandals), long pants and long sleeves. The tour ends around 4:30pm.

Tours are limited to 40, but it occasionally adds a second bus. Demand is high from January to March and in July and August, so book at least a week ahead.