India's Adani Mining has signed up buyers for around 70 percent of the coal it plans to produce from a huge mine in Australia, putting it a step closer to being able to seal funding for the A$10 billion ($7.9 billion) project. The key hurdle Adani needs to clear to secure loans for the Carmichael mine, rail and port project is dredging approval to expand its Abbot Point port. Australia's environment minister is expected to rule on that in the second half of this year.