Just in case you haven't got the message John Key has come out to day and said ".... that there are serious deficiencies in New Zealand's mining safety regulations."
So you can't blame the RMA or govt regs on HWF's PRC losses. At best you can say the government failure to have stronger regulation gave developers an opportunity to exploit a situation that wouldn't be found in Australia. This begins to sheet the responsibility for the deaths more in the direction of the backers of that venture and those backers are the shareholders. This means folks like yourself and AH directly, and indirectly the folk who invested with AH are one of the reasons why those miners died. You and AH balanced the risk of mine problems (including death) against return and you chose the path to riches, blinded by the lure of "money in the bank" rather than thinking people alive and breathing above ground might be more important.