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.
Minas Gerais Secretary said proposal falls short of the required environmental and social compensation for a tailings dam collapse that killed 19 people and contaminated waterways in two states.