Might be worth reading financials of some of the companies you mention to shed further light, but here is some high lights;
-NST; For the financial year ended 30 June 2015, the Group reported a record profit after tax of $92 million (2014: $22 million).
-EVN; The Group posted a record underlying profit after tax of $106.050 million and a record statutory net profit after tax of $100.115 million (30 June 2014: $50.017 million) for the year ended 30 June 2015, an increase of 100% on 2014.
This increase was driven by record production, a strong focus on cost control and a favourable Australian dollar for POG...