The Maria Reyna and Caballito properties consist of a large, contiguous block of mineral rights with potential to host mineral deposits close to the Constancia processing facilities.
Chile's environmental regulator issued a series of measures against the Ojos del Salado mine, alleging "over-extraction of material" could have caused the sinkhole.
Penn State researchers are working to transform compostable products into micro or nanoscale particles capable of extracting rare earth elements from electronic waste.
The world's biggest producer of manganese said its underlying earnings for the year ended June 30 came in at $2.6 billion, compared with $489 million a year ago.