In summary:
+A$4m in the bank at March 31st
+A$2.5m to be collected in May (Tranche 2)
-A$2.5m owed to Cominiere at end of DD
-A$1.0m owed to Dathomir (I thought this was due first week of March, but must be within 30 days after DD)
-A$1.2m operational expenditure forecast for June quarter
=$1.8m in bank at June 30th
+300 million options to be exercised @ $0.03
Unless a large amount of options are exercised (which does seem likely), they could need a CR/some form of funding early 2Q FY18. The next ~A$2m payment wouldn't be due until May 2018.