On July 20 soldiers, police and supposed "pro-mining activists" broke up an encampment that environmentalists and area residents had set up at Cerro Negro in the northwestern Argentine province of Catamarca to protest open-pit mining. The environmentalists--who came from Córdoba, La Rioja, Santa Fe, San Juan and Buenos Aires as well as from Catamarca—had camped out at the intersection of national highways 40 and 60 since July 9 to block trucks heading to the massive Bajo de la Alumbrera gold and copper deposit near the border with Chile. The protesters let other traffic pass.