Russia's finance ministry proposed setting a mineral extraction tax linked to global prices for producers of iron ore, coking coal and fertilizers.

The country's tax authority is asking Rio to pay $277m related to a 2015 borrowing used to pay an intragroup dividend.

Researches at the University of Waterloo found that catastrophic tailings flows have happened once every two to three years since 1965.

Researchers at the Queensland University of Technology propose the idea of using feldspars found in mine tailings as part of a potential cheaper catalyst for hydrogen fuel production.