First Quantum Minerals (TSX: FM) has outlined the La Granja project it holds with Rio Tinto (ASX. LSE, NYSE: RIO) in Peru as one of the copper sector’s largest undeveloped deposits, according to a resource update. La Granja’s (meaning “the farm”) orebody in the country’s northern Cajamarca region contains 4.8 billion measured and indicated tonnes grading 0.48% copper, equal to 23 million tonnes of contained copper, First Quantum said in a new NI 43-101 technical report.