he saw La Virgen de la Caridad del Cobre in a vision.
The Lady of the Charity of Copper? Or maybe there's a town named Cobre and it's just The Lady of the Charity of Cobre.
It sounds like a prophecy passed by oral tradition -- probably not written down anywhere. A little bit of web surfing showed me "40 years" and "at least 40 years."
She is the patroness of Cuba and the Miami exile community. They have a beautiful shrine in Miami (a replica of the original Cuban basillica) and a vibrant faith community inspired by Cuban priests and sisters. It sits on the water off Biscayne bay near Vizcaya; my favorite place to visit in Miami.