Simplify the following text for a Grade 9 native English-speaking person.
Original: As Mexicana de Cobre , the federal government spent hundreds of millions of dollars to develop La Caridad , and revive other mines in the area .
Simplified: The federal government spent hundreds of millions of dollars to develop La Caridad ( which was also called Mexicana de Cobre ) . They also re-opened other mines in the area .