The company, which has been present in the south-eastern African country for more than a decade, says that by 2021 will be producing 3,000 tonnes of rare earths per year.
The junior miner claims the Department of Antioquia's mining authority did not process its exploration application in accordance with the country’s mining code.
Fresh bid is far better than the $2.55bn it offered earlier this month and considerably more than the $2.45bn offered by Yancoal, the Chinese-backed miner that is Rio’s preferred buyer.
The suit claims that host Oliver, the show's writers, HBO, and Time Warner executed "a meticulously planned attempt to assassinate" Murray's character and reputation.