The grim discovery was made in the municipality of Salvatiera in the state of Guanajuato, where the murder rate has risen amid a violent war between peat drug cartels.
At least 10 of the bodies are women and most of the bodies belong to many young people, even teenagers, according to Carla Quintana, head of the National Search Commission in Mexico.
An alarm filed by relatives of missing persons has led to the largest discovery of secret graves in Guanajuato, she told a news conference Wednesday afternoon.
“We have more possible positive developments that we will continue to work on here until we finish the work,” she said.
Guanajuato recorded 2,250 murders between January and August this year, according to official figures, an increase of more than 25% over the same period last year.