The $300 million deal, which incorporates the Great Noligwa underground mine and related infrastructure, is expected to boost Harmony's operational cash flow by 60%.
Democrats and environmentalists becoming increasingly concerned about why Interior Department remains silent about the National Academy of Sciences study.
Canada's top court ruled in favor of aboriginal bands seeking say in Yukon territorial government effort to develop coal and iron deposits in wilderness.
The New South Wales Government decided there would be no open-pit mining at the site formerly known as Drayton South, but it paved the way for an underground mine instead.