Marco Antonio Corrales has given up on the peanut and alfalfa crops he was growing this season along the banks of the Sonora River in northern Mexico. That’s because the waterway, polluted by a copper sulfate solution that spilled from Grupo Mexico SAB (GMEXICOB)’s Buenavista del Cobre mine last month, then overflowed after Hurricane Odile soaked the region, flooding Corrales’s fields. “We have to assume we’ve lost everything,” said the 46-year-old grower, sporting a cowboy hat and a chunky silver belt buckle. “The Sonora River was our livelihood.” The combination of Mexico’s largest mining spill and heavy rains swelling the chemical-tainted river are causing losses to almost all cattle ranchers and crop damage in an area the government says accounts for nearly 20 percent of the state economy. Sonora’s worst rainy season in 40 years also sparked officials, who shuttered one-fifth of the mine’s production, to reduce levels at all containment pools, deputy environmental prosecutor Arturo Rodriguez said.