Quechua miners are only nominally Catholic. In practice they believe in Pachamama ruling the Earth and El Tio ruling the Underworld. As they perform their work in the kingdom of the latter it is essential for them to keep him appeased. So twice a month they offer him a treat by providing cigarettes and alcohol, and getting drunk themselves. They seek collaboration from the god, represented by a statue erected in a side gallery of the mine which is not worked. Silver ore deposits on the Cerro Rico mountain provide jobs for over 20,000 miners in the town of Potosi. The number of mines in the area is estimated at 500.