The rite is performed to call for the blessing of the Virgin of Urkupina.
Legend has it that Virgin Mary appeared to a shepherd girl to instruct her to take rocks from this dried river that miraculously turned into silver when she reached home.
On Tuesday, pilgrims struck rocks to try to improve their fortunes.
When a rock is easily split, their wish will be soon fulfilled. If believers have more difficulty striking and splitting the rock, it will take more time.
“You can ask for a house, a car, all your wishes are fulfilled,” said believer Ricardo Tarqui. “I broke the rock with a second blow and in a third attempt. I have been able to buy a house and also a car.”
While Bolivia is a largely Roman Catholic country, it has kept its strong indigenous roots.
This unique ritual, mixing Catholic and local culture, hits a sweet spot with many pilgrims from around the country and abroad.